TWI640126B - Antenna structure and wireless communication device with same - Google Patents

Abstract

An antenna structure includes a housing, a first feeding source, and a first radiator. The housing includes a front frame, a back plate, and a frame. The frame is provided with a slot, and the front frame is provided with a break point. The break point is in communication with the slot and extends to block the front frame, and the slot and the break point divide a metal long arm and a metal short arm from the housing, the first radiator The first radiating portion is electrically connected to the first feeding source, and the other end is spaced apart from the metal long arm. One end of the second radiating portion is electrically connected to the first feeding source, and the other end is electrically connected to the metal short arm.

Description

Antenna structure and wireless communication device having the same

The invention relates to an antenna structure and a wireless communication device having the same.

With the advancement of wireless communication technology, wireless communication devices are constantly moving toward a thin and light trend, and consumers are increasingly demanding the appearance of products. Due to the advantages of the metal casing in terms of appearance, mechanism strength, heat dissipation effect, etc., more and more manufacturers have designed wireless communication devices with metal casings, such as metal back plates, to meet the needs of consumers. However, the metal casing easily interferes with the signal radiated by the antenna disposed therein, and the broadband design is not easily achieved, resulting in poor radiation performance of the built-in antenna. Moreover, the backing plate is usually provided with a slot and a break point, which will affect the integrity and aesthetics of the backboard.

In view of the above, it is necessary to provide an antenna structure and a wireless communication device having the same.

An antenna structure includes a housing, a first feeding source, and a first radiator. The housing includes a front frame, a back plate, and a frame. The frame is sandwiched between the front frame and the back plate. a slot is formed in the frame, a break point is formed on the front frame, and the break point is connected to the slot and extends to block the front frame, the slot and the break point are from the The housing defines a metal long arm and a metal short arm, and the first radiator is disposed in the housing, and includes a first radiating portion and a second radiating portion, and one end of the first radiating portion is electrically connected to the first portion a feed source, the other end is spaced apart from the metal long arm; one end of the second radiating portion is electrically connected to the first feed source, and the other end is electrically connected to the metal short arm.

A wireless communication device comprising the antenna structure described in the above item.

The antenna structure and the wireless communication device having the antenna structure can cover low frequency, intermediate frequency, high frequency (LTE-A Band 40, Band 41 frequency band), WIFI 2.4/5 GHz dual frequency, and have a wide frequency range. In addition, the slot and the break point on the housing of the antenna structure are disposed on the front frame and the frame, and are not disposed on the backplane, so that the backboard constitutes an all-metal structure, that is, the back There are no insulating slots, broken wires or breakpoints on the board, so that the back board can avoid the integrity and aesthetics of the back board due to the setting of slotting, disconnection or breakpoint.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

It should be noted that when an element is referred to as "electrically connected" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, a wire connection or a non-contact connection, for example, a non-contact coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. The terminology used in the description of the invention herein is for the purpose of describing the particular embodiments. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below may be combined with each other without conflict.

Example 1-2

Referring to FIG. 1, a first preferred embodiment of the present invention provides an antenna structure 100 that can be applied to a wireless communication device 400 such as a mobile phone or a personal digital assistant to transmit and receive radio waves to transmit and exchange wireless signals.

Referring to FIG. 2 and FIG. 3 , the antenna structure 100 includes a metal member 11 , a first feed source 13 , a second feed source 14 , and a first switching circuit 15 . The metal member 11 can be an outer casing of the wireless communication device 400. The metal member 11 includes a metal front frame 111, a metal back plate 112, and a metal frame 113. The metal front frame 111, the metal back plate 112, and the metal frame 113 may be integrally formed. The metal front frame 111, the metal back plate 112, and the metal frame 113 constitute an outer casing of the wireless communication device 400. An opening (not shown) is disposed on the metal front frame 111 for receiving the display unit 401 of the wireless communication device 400. It can be understood that the display unit 401 has a display plane exposed to the opening, and the display plane is disposed substantially parallel to the metal back plate 112.

The metal back plate 112 is disposed opposite to the metal front frame 111. The metal back plate 112 is a single metal piece integrally formed. Except for the openings 404 and 405 provided for exposing the camera lens 402 and the flash 403 and the like, there is no insulating slot, disconnection or break. Point (see Figure 3). The metal back plate 112 corresponds to the ground of the antenna structure 100.

The metal frame 113 is interposed between the metal front frame 111 and the metal back plate 112, and is disposed around the circumference of the metal front frame 111 and the metal back plate 112 respectively to form with the display unit. 401. The metal front frame 111 and the metal back plate 112 together form an accommodating space 114. The accommodating space 114 is configured to receive electronic components or circuit modules of the circuit board, the processing unit, and the like of the wireless communication device 400.

The metal frame 113 includes at least a top portion 115, a first side portion 116, and a second side portion 117. The top portion 115 connects the metal front frame 111 and the metal back plate 112. The first side portion 116 is disposed opposite to the second side portion 117, and is disposed at two ends of the top portion 115, preferably vertically. The first side portion 116 and the second side portion 117 are also connected to the metal front frame 111 and the metal back plate 112. The metal frame 113 is further provided with a slot 118, and the metal front frame 111 is provided with a break point 119. In the embodiment, the slots 118 are disposed on the top portion 115 and extend to the first side portion 116 and the second side portion 117, respectively. It can be understood that in other embodiments, the slot 118 may also be disposed only on the top portion 115 without extending to any one of the first side portion 116 and the second side portion 117, or the opening A slot 118 is disposed in the top portion 115 and extends only along one of the first side portion 116 and the second side portion 117.

The break point 119 is in communication with the slot 118 and extends to block the metal front frame 111. In the present embodiment, the break point 119 is disposed adjacent to the second side portion 117, such that the break point 119 divides the metal front frame 111 into two parts, namely a metal long arm A1 and a metal short arm A2. The metal front frame 111 on the side of the break point 119 extends to a portion corresponding to one of the end points E1 of the slot 118 to form the metal long arm A1. The metal front frame 111 on the other side of the break point 119 extends to a portion corresponding to the other end point E2 of the slot 118 to form the metal short arm A2. In this embodiment, the position where the break point 119 is opened does not correspond to the middle of the top portion 115, so the length of the metal long arm A1 is greater than the length of the metal short arm A2.

In addition, the slot 118 and the break point 119 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto), thereby separating the metal long arm A1. The metal short arm A2 and the metal back plate 112.

It can be understood that the upper portion of the metal front frame 111 and the metal frame 113 is not provided with other insulating slots, broken lines or break points except the slot 118 and the break point 119, so the metal front frame 111 There is only one breakpoint 119 in the top half, and there are no other breakpoints.

The first feed source 13 can be electrically connected to one end of the metal long arm A1 near the first side portion 116 by a matching circuit (not shown), thereby feeding current to the metal long arm A1. The metal long arm A1 is caused to excite a first mode to generate a radiation signal of the first frequency band. In this embodiment, the first mode is a low frequency mode, and the first frequency band is a frequency band of 700-900 MHz.

The second feed source 14 can be electrically connected to one end of the metal short arm A2 near the break point 119 by a matching circuit (not shown), thereby feeding current to the metal short arm A2. The metal short arm A2 excites two corresponding modes, which form a wideband resonance application (ie, the 1710-2690MHz band), which can cover the intermediate frequency, high frequency, and WIFI 2.4 GHz bands. .

Referring to FIG. 4 together, the first switching circuit 15 is electrically connected to the metal long arm A1, which includes a switching unit 151 and at least one switching element 153. The switching element 153 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 153 are connected in parallel with each other, and one end thereof is electrically connected to the switching unit 151, and the other end is electrically connected to the metal backing plate 112. Thus, by controlling the switching of the switching unit 151, the metal long arm A1 can be switched to a different switching element 153. Since each of the switching elements 153 has a different impedance, the frequency band of the first mode of the metal long arm A1 can be adjusted by the switching of the switching unit 151. The adjustment band described in the item is to shift the band to a low frequency or to a high frequency.

It can be understood that, referring to FIG. 5 and FIG. 6 together, the first switching circuit 15 can further include a resonant circuit 155. Referring to FIG. 5, in one embodiment, the number of the resonant circuits 155 is one, and the resonant circuit 155 includes an inductor L and a capacitor C connected in series. The resonant circuit 155 is electrically connected between the metal long arm A1 and the metal back plate 112, and is disposed in parallel with the switching unit 151 and the at least one switching element 153.

Referring to FIG. 6, in another embodiment, the number of the resonant circuits 155 is the same as the number of the switching elements 153, that is, a plurality. Each resonant circuit 155 includes an inductance L and a capacitance C connected in series with each other. Each of the resonant circuits 155 is electrically connected between the switching unit 151 and the metal backing plate 112, and is disposed in parallel with the corresponding switching element 153.

FIG. 7 is a schematic diagram showing the relationship between the S parameter (scattering parameter) and the frequency when a resonant circuit 155 is connected in parallel to the switching unit 151 side of the first switching circuit 15 shown in FIG. 5. Here, it is assumed that when the first switching circuit 15 does not increase the resonant circuit 155 shown in FIG. 4, the antenna structure 100 operates in the first mode (refer to curve S51). When the first switching circuit 15 increases the resonant circuit 155, the resonant circuit 155 may cause the metal long arm A1 to additionally resonate to a narrow frequency mode (second mode, please refer to curve S52) to By generating the radiation signal of the second frequency band, the application frequency band of the antenna structure 100 can be effectively increased to achieve multi-frequency or broadband application. In an embodiment, the second frequency band may be a GPS frequency band, and the second mode is also a GPS resonant mode.

FIG. 8 is a schematic diagram showing the relationship between the S parameter (scattering parameter) and the frequency when one resonant circuit 155 is connected in parallel to the side of each switching element 153 in the first switching circuit 15 shown in FIG. 6. Here, it is assumed that when the first switching circuit 15 does not increase the resonant circuit 155 shown in FIG. 6, the antenna structure 100 can operate in the first mode (refer to curve S61). Thus, when the first switching circuit 15 increases the resonant circuit 155, the resonant circuit 155 can cause the metal long arm A1 to additionally resonate out of the narrow frequency mode (refer to curve S62), that is, GPS resonance. The modality can effectively increase the application frequency band of the antenna structure 100 to achieve multi-frequency or broadband applications. In addition, by setting the inductance value of the inductor L in the resonant circuit 155 and the capacitance value of the capacitor C, the frequency band of the narrowband mode at the first mode switching can be determined. For example, in one embodiment, as shown in FIG. 8, the antenna structure 100 can be switched when the switching unit 151 is switched to a different switching element 153 by setting the inductance value and the capacitance value in the resonant circuit 155. The narrow-band mode is also switched, for example, it can be moved from f1 to fn, and the range of motion is very wide.

It can be understood that, in another embodiment, the frequency band of the narrowband mode can be fixed by setting the inductance value and the capacitance value in the resonant circuit 155, so that the switching unit 151 switches to which one. The switching element 153 has a fixed frequency band of the narrow frequency mode.

It can be understood that in other embodiments, the resonant circuit 155 is not limited to include the inductor L and the capacitor C, and may also be composed of other resonant components.

FIG. 9 is a schematic diagram of current flow when the antenna structure 100 operates in a low frequency mode and a GPS mode. Obviously, when current enters the metal long arm A1 from the first feed source 13, it will flow through the metal long arm A1 and flow to the break point 119 (refer to the path P1), thereby exciting the Low frequency mode. In addition, since the antenna structure 100 is provided with the first switching circuit 15, the low frequency mode of the metal long arm A1 can be switched by the first switching circuit 15. Moreover, due to the setting of the resonant circuit 155 in the first switching circuit 15, the low frequency mode and the GPS mode can be simultaneously present. That is to say, in the embodiment, the current of the GPS mode is contributed by two parts, one part is the low frequency mode excitation (refer to the path P1), and the other part is the inductance L of the resonant circuit 155. The excitation is matched with the capacitance of the capacitor C (refer to path P2). The current of the path P2 flows from the metal short arm A2 toward one end of the second feed source 14 to the other end of the metal short arm A2 away from the second feed source 14.

FIG. 10 is a schematic diagram of current flow when the antenna structure 100 operates in the 1710-2690 MHz frequency band. Obviously, when current enters the metal short arm A2 from the second feed source 14, current will sequentially flow through the metal front frame 111, the second side portion 117 and flow through the back metal back plate 112 ( Refer to path P3), which in turn excites the third mode to generate the third band (ie, the 1710-2690MHz band) radiated signals to cover the intermediate frequency, high frequency, and WIFI 2.4 GHz bands. It will be apparent from FIG. 4 and FIG. 10 that the metal backing plate 112 corresponds to the ground of the antenna structure 100.

FIG. 11 is a graph of S parameters (scattering parameters) when the antenna structure 100 operates in a low frequency mode and a GPS mode. The curve S91 is the S11 value when the antenna structure 100 operates in the LTE Band 28 frequency band (703-803 MHz). Curve S92 is the S11 value when the antenna structure 100 operates in the LTE Band 5 band (869-894 MHz). Curve S93 is the S11 value when the antenna structure 100 operates in the LTE Band 8 band (925-926 MHz) and the GPS band (1.575 GHz). Obviously, the curves S91 and S92 respectively correspond to two different frequency bands, and respectively correspond to two of the plurality of low frequency modes that the switching circuit 15 can switch.

Figure 12 is a graph showing the radiation efficiency of the antenna structure 100 when operating in a low frequency mode. The curve 101 is the radiation efficiency when the antenna structure 100 operates in the LTE Band 28 frequency band (703-803 MHz). Curve S102 is the radiation efficiency of the antenna structure 100 when operating in the LTE Band 5 band (869-894 MHz). Curve S103 is the radiation efficiency of the antenna structure 100 when operating in the LTE Band 8 band (925-926 MHz). Obviously, the curves S101, S102 and S103 respectively correspond to three different frequency bands, and respectively correspond to three of the plurality of low frequency modes that the switching circuit 15 can switch.

Figure 13 is a graph showing the radiation efficiency of the antenna structure 100 when operating in a GPS mode. 14 is a graph of S-parameters (scattering parameters) when the antenna structure 100 operates in the 1710-2690 MHz frequency band (ie, the intermediate frequency, high frequency, and WIFI 2.4 GHz frequency bands). Figure 15 is a graph showing the radiation efficiency of the antenna structure 100 when operating in the 1710-2690 MHz band (i.e., the intermediate frequency, high frequency, and WIFI 2.4 GHz bands).

Obviously, as can be seen from FIG. 11 to FIG. 15, the antenna structure 100 can operate in corresponding low frequency bands, such as LTE Band 28 (703-803 MHz), LTE Band 5 (869-894 MHz), and LTE Band 8 (925). -926MHz). In addition, the antenna structure 100 can also operate in the GPS frequency band (1.575 GHz) and the 1710-2690 MHz frequency band, that is, to cover low, medium, and high frequency, and have a wide frequency range, and when the antenna structure 100 operates in the above frequency band, The working frequency can meet the antenna working design requirements and has better radiation efficiency.

Please refer to FIG. 16, which is an antenna structure 200 according to a second preferred embodiment of the present invention. The antenna structure 200 includes a metal member 11, a first feed source 13, a second feed source 14, and a first switching circuit 15. The metal member 11 includes a metal front frame 111, a metal back plate 112, and a metal frame 113. The metal frame 113 includes at least a top portion 115, a first side portion 116, and a second side portion 117. The metal frame 113 is further provided with a slot 118, and the metal front frame 111 is further provided with a break point 119. The break point 119 divides the metal front frame 111 into two parts, and the two parts respectively include a metal long arm A1 and a metal short arm A2.

It can be understood that the antenna structure 200 is different from the antenna structure 100 in that the antenna structure 200 further includes a first radiator 26, a third feed source 27, an isolation portion 28, a second switching circuit 29, and a second radiator. 30 and a fourth feed source 31.

The first radiator 26 is disposed in the accommodating space 114 surrounded by the metal member 11 and disposed adjacent to the metal short arm A2 and spaced apart from the metal back plate 112. In the embodiment, the first radiator 26 is substantially straight and disposed parallel to the top 215. One end of the first radiator 26 is connected to the partition 28 and the other end extends toward the first side 116. One end of the third feed source 27 is electrically connected to the first radiator 26 by a matching circuit (not shown), and the other end is electrically connected to the isolation portion 28 for the first radiator 26 feed current.

It can be understood that, in this embodiment, since the frequency bands of the resonance of the second feed source 14 and the third feed source 27 are relatively close, the antenna isolation is easily caused. Therefore, the isolation portion 28 is configured to extend the structure current paths of the two feed sources, that is, the second feed source 14 and the third feed source 27, to lift the metal short arm A2 and the first radiation. The isolation between the bodies 26.

It can be understood that the partition portion 28 can be any shape and size, or is a flat metal piece, and only needs to ensure that the partition portion 28 can extend the second feed source 14 and the third feed source 27 The current path is structured to improve the isolation between the metal short arm A2 and the first radiator 26. For example, in the embodiment, the partition portion 28 has a block shape and is disposed on the metal back plate 112 and extends from the second side portion 117 toward the first side portion 116.

It can be understood that, referring to FIG. 17 , in other embodiments, the antenna structure 200 further includes a metal frame 32 . The metal frame 32 is disposed in the accommodating space 114 and connected to the metal member 11 . The partition portion 28 is formed in a block shape and is disposed on the metal back plate 112 and extends from the second side portion 117 toward the first side portion 116 and is connected to the metal frame 32.

It can be understood that, referring to FIG. 18 , in other embodiments, the antenna structure 200 further includes a metal frame 32 . The metal frame 32 is disposed in the accommodating space 114 and connected to the metal member 11 . The partition portion 28 is formed in a block shape and is disposed on the metal back plate 112 and extends from the second side portion 117 toward the first side portion 116 and spaced apart from the metal frame body 32 .

It can be understood that, referring to FIG. 19 , in other embodiments, the antenna structure 200 further includes a metal frame 32 . The metal frame 32 is disposed in the accommodating space 114 and connected to the metal member 11 . The partition portion 28 has a rectangular sheet shape and is disposed on one side of the metal frame 32 and spaced apart from the second side portion 117 and the metal back plate 112.

Referring again to FIG. 16, one end of the second switching circuit 29 is electrically connected to the first radiator 26, and the other end is connected to the metal backing plate 112. The second switching circuit 29 is used to adjust the frequency band of the high frequency mode of the first radiator 26. The specific circuit structure and working principle can be referred to the description of the first switching circuit 15 of FIG. 4, and details are not described herein again.

It can be understood that the second radiator 30 includes a first radiating portion 301 and a second radiating portion 302. The first radiating portion 301 is substantially U-shaped, and includes a first radiating section 303, a second radiating section 304, and a third radiating section 305 electrically connected in sequence. The first radiating section 303 is substantially straight and disposed parallel to the top 215. The second radiating section 304 has a straight strip shape, one end of which is perpendicularly connected to the end of the first radiating section 303 near the second side portion 117, and the other end is parallel to the second side portion 117 and close to the The direction of the top portion 215 extends to form an L-shaped structure with the first radiating portion 303. The third radiating section 305 has a substantially rectangular strip shape, one end of which is connected to the second radiating section 304 away from one end of the first radiating section 303, and the other end is parallel to the first radiating section 303 and close to the The third radiating section 305 and the first radiating section 303 are respectively disposed on the same side of the second radiating section 304, and are respectively disposed on the second radiating section 304. Both ends.

The second radiating portion 302 is substantially T-shaped and includes a first connecting portion 306, a second connecting portion 307, and a third connecting portion 308. The first connecting section 306 has a substantially rectangular strip shape, one end of which is electrically connected to the end of the first radiating section 303 away from the second radiating section 304, and the other end is parallel to the second radiating section 304 and close to the The direction of the third radiating section 305 extends. The second connecting portion 307 is substantially straight, and one end thereof is perpendicularly connected to one end of the first connecting portion 306 away from the first radiating portion 303, and the other end is parallel to the first radiating portion 303 and close to the first portion. The direction of the second radiating section 304 extends. The third connecting section 308 is substantially straight and connected to the connection point of the first connecting section 306 and the second connecting section 307, and is parallel to the first radiating section 303 and close to the first side. The portion 116 extends in the same line as the second connecting portion 307 until it is connected to the metal front frame 111 in front of the first side portion 116.

The fourth feed source 31 is disposed on the metal front frame 111 and electrically connected to the connection point of the first radiating section 303 and the first connecting section 306 for respectively feeding current to the The first radiating portion 301 and the second radiating portion 302 further excite corresponding working modes, such as WIFI 2.4 GHz mode and WIFI 5 GHz mode.

It can be understood that when the antenna structure 200 operates in the low frequency mode and the GPS mode, the current direction is consistent with the current direction when the antenna structure 100 operates in the low frequency mode and the GPS mode. For details, refer to FIG. This will not be repeated here.

It can be understood that when the antenna structure 200 is operated in the intermediate frequency mode, the current direction of the antenna structure 200 is consistent with the current direction when the antenna structure 100 operates in the 1710-2690 MHz frequency band. For details, refer to FIG. 10 , and details are not described herein again.

Please refer to 20 for a schematic diagram of the current direction when the antenna structure 200 operates in a high frequency mode. Obviously, when the current enters the first radiator 26 from the third feed source 27, it flows to the first radiator 26 away from one end of the third feed source 27 (refer to the path P4), thereby exciting The fourth mode is to generate a radiation signal of the fourth frequency band. The fourth mode of this embodiment is a high frequency mode. In addition, since the antenna structure 200 is provided with a grounded second switching circuit 29, the high frequency mode can be switched by the second switching circuit 29, for example, the antenna structure 200 can be switched to the LTE Band 40 band (2300). - 2400 MHz) or LTE Band 41 band (2496-2690 MHz) and causes the high frequency mode to coexist with the intermediate frequency mode.

FIG. 21 is a schematic diagram of current flow when the antenna structure 200 operates in a dual-frequency WIFI mode. Obviously, when current enters the second radiator 30 from the fourth feed source 31, current will sequentially flow through the first radiation segment 303, the second radiation segment 304, and the third radiation segment 305 (refer to path P5). And inducing a corresponding fifth mode to generate a radiation signal of the fifth frequency band. The fifth mode of this embodiment is a WIFI 2.4 GHz mode. In addition, after the current enters the second radiator 30 from the fourth feed source 31, the current will also flow through the first connecting section 306 and the second connecting section 307 (refer to the path P6), thereby exciting the corresponding Six modes to generate the radiation signal of the sixth frequency band. The sixth mode of this embodiment is a WIFI 5 GHz mode.

It can be understood that when the antenna structure 200 operates in a low frequency mode and a GPS mode, its S parameter (scattering parameter) graph and the radiation efficiency map are both when the antenna structure 100 operates in a low frequency mode and a GPS mode. The S-parameter (scattering parameter) graph and the radiation efficiency graph are identical. For details, refer to FIG. 10, FIG. 11 and FIG. 12, and details are not described herein again.

FIG. 22 is a graph of S parameters (scattering parameters) when the antenna structure 200 operates in an intermediate frequency mode and a high frequency mode. The curve S201 is an S11 value when the inductance of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.13 picofarads (pf). The curve S202 is an S11 value when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.15 pf. The curve S203 is an S11 value when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.2 pf. Curve S204 is the S11 value when the first switching circuit 15 in the antenna structure 200 is open (ie, not switched to any switching element 153). The curve S205 is an S11 value when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.13 pf. The curve S206 is an S11 value when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.15 pf. A curve S207 is an S11 value when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.2 pf. Curve S208 is the S11 value when the second switching circuit 29 in the antenna structure 200 is open (ie, not switched to any switching element).

FIG. 23 is a graph showing the radiation efficiency of the antenna structure 200 when operating in an intermediate frequency mode and a high frequency mode. The curve S211 is the radiation efficiency when the inductance of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.13 picofarads (pf). The curve S212 is the radiation efficiency when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.15 pf. The curve S213 is the radiation efficiency when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.2 pf. Curve S214 is the radiation efficiency of the first switching circuit 15 in the antenna structure 200 when it is open (ie, not switched to any switching element 153). The curve S215 is the radiation efficiency when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.13 pf. The curve S216 is the radiation efficiency when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.15 pf. A curve S217 is a radiation efficiency when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.2 pf. Curve S218 is the radiation efficiency of the second switching circuit 29 in the antenna structure 200 when it is open (ie, not switched to any switching element).

FIG. 24 is a graph of S parameters (scattering parameters) when the antenna structure 200 operates in the WIFI 2.4 GHz band and the WIFI 5 GHz band. Figure 25 is a graph showing the radiation efficiency of the antenna structure 200 when operating in the WIFI 2.4 GHz band. Figure 26 is a graph showing the radiation efficiency of the antenna structure 200 when operating in the WIFI 5 GHz band.

Obviously, from FIG. 11 to FIG. 13 and FIG. 22 to FIG. 26, the antenna structure 200 can operate in corresponding low frequency bands, such as LTE Band 28 (703-803 MHz) and LTE Band 5 (869-894 MHz). LTE Band 8 band (925-926MHz). In addition, the antenna structure 100 can also work in the GPS frequency band (1.575 GHz), the intermediate frequency band (1805-2170 MHz), the high frequency band (2300-2400 MHz and 2496-2690 MHz), and the WIFI 2.4/5 GHz dual band, that is, Low, medium, high frequency, WIFI 2.4/5GHz dual frequency, wide frequency range, and when the antenna structure 200 works in the above frequency band, its working frequency can meet the antenna working design requirements, and has better radiation efficiency.

As described in the foregoing embodiments, the metal long arm A1 can excite the first mode to generate a radiation signal in a low frequency band, and the metal short arm A2 can excite the third mode to generate a radiation signal in the intermediate frequency band and the high frequency band. A radiator 26 can excite the fourth mode to generate a radiation signal in the high frequency band. Therefore, the wireless communication device 400 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands to increase the transmission bandwidth by using Carrier Aggregation (CA) technology of LTE-Advanced. More specifically, the wireless communication device 400 can use the carrier aggregation technique and use the first radiator 26 to simultaneously receive or transmit wireless signals in a plurality of different frequency bands. The wireless communication device 400 can also use the carrier aggregation technique and use the metal long arm A1, the metal short arm A2, and the first radiator 26 to receive or transmit wireless signals simultaneously in a plurality of different frequency bands.

It can be understood that in other embodiments, the positions of the first radiator 26 and the second switching circuit 29 and the second radiator 30 are interchangeable, and the position of the isolation portion 28 is unchanged. Specifically, one end of the first radiator 26 is connected to the metal front frame 111, and the other end extends in the direction of the second side portion 117. One end of the second switching circuit 29 is electrically connected to the first radiator 26, and the other end is connected to the metal backing plate 112. The third feed source 27 is disposed on the metal front frame 111 and electrically connected to the first radiator 26 . The second radiator 30 is disposed in the accommodating space 114 surrounded by the metal member 11 and disposed adjacent to the metal short arm A2. The third connecting portion 308 of the second radiator 30 is connected to one end of the metal front frame 111 to be electrically connected to the partition portion 28. One end of the fourth feed source 31 is electrically connected to a connection point of the first radiating section 303 and the first connecting section 306, and the other end is electrically connected to the isolation portion 28.

In addition, the antenna structure 100/200 is provided with the metal member 11, and the slot 118 and the break point 119 of the metal member 11 are disposed on the metal front frame 111 and the metal frame 113, and are not disposed. On the metal backing plate 112, the metal backing plate 112 forms an all-metal structure, that is, the metal backing plate 112 has no insulating slots, broken lines or break points, so that the metal backing plate 112 can be Avoid affecting the integrity and aesthetics of the metal backing plate 112 due to the provision of slots, breaks, or breakpoints.

Example 3-5

Referring to FIG. 27, a third preferred embodiment of the present invention provides an antenna structure 500, which can be applied to a wireless communication device 600 such as a mobile phone or a personal digital assistant for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to FIG. 28 and FIG. 29 together, the antenna structure 500 includes a housing 51, a first feed source 53, a second feed source 54, a first switching circuit 55, and a second switching circuit 57. The housing 51 can be an outer casing of the wireless communication device 600. In the present embodiment, the housing 51 is made of a metal material. The housing 51 includes a front frame 511, a back plate 512, and a frame 513. The front frame 511, the back plate 512 and the frame 513 may be integrally formed. The front frame 511, the back plate 512, and the bezel 513 constitute an outer casing of the wireless communication device 600. An opening (not shown) is disposed on the front frame 511 for receiving the display unit 601 of the wireless communication device 600. It can be understood that the display unit 601 has a display plane, the display plane is exposed to the opening, and the display plane is disposed substantially parallel to the back plate 512.

The back plate 512 is disposed opposite to the front frame 511. The back plate 512 is directly connected to the frame 513, and there is no gap between the back plate 512 and the frame 513. The back plate 512 is an integrally formed single metal piece, and openings 606, 607 are provided for exposing the camera lens 604 and the flash 605 and the like. The backing plate 512 is not provided with any slot, broken or broken point for separating the insulation of the backing plate 512 (refer to FIG. 29). The backplane 512 can serve as the antenna structure 500 and the ground of the wireless communication device 600.

In another embodiment, a shielding mask for shielding electromagnetic interference or supporting a frame in the display unit 601 may be disposed on a side of the display unit 601 facing the backplane 512. The shield or the middle frame is made of a metal material. The shield or middle frame can be coupled to the back plate 512 to serve as the antenna structure 500 and the wireless communication device 600.

The frame 513 is disposed between the front frame 511 and the back plate 512, and is disposed around the periphery of the front frame 511 and the back plate 512 to be opposite to the display unit 601 and the front The frame 511 and the back plate 512 together define an accommodating space 514. The accommodating space 514 is configured to receive electronic components or circuit modules of the circuit board, the processing unit, and the like of the wireless communication device 600.

The frame 513 includes at least a tip portion 515, a first side portion 516, and a second side portion 517. In the embodiment, the end portion 515 is the bottom end of the wireless communication device 600. The end portion 515 connects the front frame 511 and the back plate 512. The first side portion 516 is disposed opposite to the second side portion 517, and is disposed at two ends of the end portion 515, preferably vertically. The first side portion 516 and the second side portion 517 are also connected to the front frame 511 and the back plate 512.

A port 518 and a slot 519 are defined in the frame 513, and a break point 520 is defined in the front frame 511. The port 518 is opened at a position of the end portion 515 and penetrates the end portion 515. The wireless communication device 600 also includes an electronic component 603. In this embodiment, the electronic component 603 is a USB module disposed in the accommodating space 514 and corresponding to the port 518 such that the electronic component 603 is from the port 518. Exposed. Thus, the user inserts a USB device through the port 518 to establish an electrical connection with the electronic component 603.

In the present embodiment, the slot 519 is disposed on the end portion 515 and communicates with the port 518 and extends to the first side portion 516 and the second side portion 517, respectively. It can be understood that in other embodiments, the slot 519 may also be disposed only at the end portion 515 without extending to any one of the first side portion 516 and the second side portion 517, or A slot 519 is disposed in the end portion 515 and extends only along one of the first side portion 516 and the second side portion 517.

The break point 520 is in communication with the slot 519 and extends to block the front frame 511. In the present embodiment, the break point 520 is disposed adjacent to the second side portion 517, such that the break point 520 divides the front frame 511 into two parts, namely a metal long arm T1 and a metal short arm T2. The portion 511 of the break point 520 is extended to a portion corresponding to one of the end points E1 of the slot 519 to form the metal long arm T1. The other side of the breakpoint 520 has a front frame 511 until it extends to a portion corresponding to the other end point E2 of the slot 519 to form the metal short arm T2. In this embodiment, the position where the breakpoint 520 is opened does not correspond to the middle of the end portion 515, so the length of the metal long arm T1 is greater than the length of the metal short arm T2. In addition, the slot 519 and the break point 520 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto), thereby separating the metal long arm T1. The metal short arm T2 and the back plate 512.

It can be understood that, in this embodiment, the slot 519 is defined in the frame 513 near one end of the back plate 512 and extends to the front frame 511 such that the metal long arm T1 and the metal short arm T2 is completely constituted by a part of the front frame 511. Of course, in other embodiments, the opening position of the slot 519 can also be adjusted according to specific needs. For example, the slot 519 is defined in the frame 513 near one end of the back plate 512 and extends toward the front frame 511 such that the metal long arm T1 and the metal short arm T2 are partially described. The front frame 511 and a part of the frame 513 are formed.

It can be understood that the front frame 511 and the lower half of the frame 513 are not provided with other insulating slots, broken lines or break points except the port 518, the slot 519 and the break point 520, so the front frame 511 There is only one breakpoint 520 in the lower half, and there are no other breakpoints.

The first feed source 53 can be electrically connected to one end of the metal long arm T1 near the first side portion 516 by a matching circuit 59 (see FIG. 27 and FIG. 31), thereby being the metal long arm. T1 feeds current such that the metal long arm T1 excites a first mode to generate a radiation signal of the first frequency band.

The second feed source 54 can be electrically connected to one end of the metal short arm T2 near the break point 520 by a matching circuit (not shown), thereby feeding current to the metal short arm T2. The metal short arm T2 excites a second mode to generate a radiation signal of the second frequency band.

Referring to FIG. 30 together, the first switching circuit 55 is electrically connected to the middle position of the metal long arm T1, and includes a first switching unit 551 and at least one first switching element 553. The first switching unit 551 is electrically connected to the metal long arm T1. The first switching element 553 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 553 are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit 551, and the other end is electrically connected to the backing plate 512, that is, grounded.

Referring to FIG. 27 and FIG. 31 together, one end of the matching circuit 59 is electrically connected to the metal long arm T1, and the other end of the matching circuit 59 is electrically connected to the first feed source 53. One end of the second switching circuit 57 is electrically connected to the matching circuit 59, and the other end is electrically connected to the backing plate 512, that is, grounded. In the embodiment, the second switching circuit 57 includes a second switching unit 571 and at least one second switching element 573. The second switching unit 571 is electrically connected to the matching circuit 59 to be electrically connected to the metal long arm T1 by the matching circuit 59. The second switching element 573 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 573 are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit 571, and the other end is electrically connected to the backing plate 512, that is, grounded. Thus, by controlling the switching between the first switching unit 551 and the second switching unit 571, the metal long arm T1 can be switched to different first switching elements 553 and/or second switching elements 573. Since each of the first switching element 553 and the second switching element 573 has different impedances, the first mode of the metal long arm T1 can be adjusted by switching between the first switching unit 551 and the second switching unit 571. The frequency band of the state. The adjustment band described in the item is to shift the band to a low frequency or to a high frequency.

32 is a schematic diagram of current flow of the antenna structure 500. Wherein, when a current enters the metal long arm T1 from the first feed source 53, it will flow through the metal long arm T1 and flow to the break point 520 (refer to the path I1), thereby exciting the The first mode is to generate a radiation signal of the first frequency band. When a current enters the metal short arm T2 from the second feed source 54, current will sequentially flow through the front frame 511, the second side portion 517, and flow to the back plate 512 (refer to path I2). And exciting the second mode to generate a radiation signal of the second frequency band. In this embodiment, the first mode is a low frequency mode, and the first frequency band is a frequency band of 704-960 MHz. The second mode is a medium-high frequency mode, and the second frequency band is a frequency band of 1710-2690 MHz. Since the antenna structure 500 is provided with the first switching circuit 55 and the second switching circuit 57, the first switching circuit 55 and the second switching circuit 57 can cooperate with each other to switch the low frequency of the metal long arm T1. Modal, without affecting the operation of medium and high frequencies.

Referring to FIG. 33, in one embodiment, the antenna structure 500 further includes a resonant circuit 58, the number of the resonant circuits 58 is one, and the resonant circuit 58 includes an inductor L and a capacitor C connected in series. The resonant circuit 58 is electrically connected between the metal long arm T1 and the back plate 512 and is disposed in parallel with the first switching unit 551 and the at least one first switching element 553.

Referring to FIG. 34, in another embodiment, the number of the resonant circuits 58 is the same as the number of the first switching elements 553, that is, a plurality. Each of the resonant circuits 58 includes inductors L1-Ln and capacitors C1-Cn connected in series with each other. Each of the resonant circuits 58 is electrically connected between the first switching unit 551 and the backing plate 512, and is disposed in parallel with the corresponding first switching element 553. It can be understood that in FIG. 30, FIG. 31, FIG. 33 and FIG. 34, the shield or the middle frame can replace the back plate 512 for the first switching circuit 55 and/or the second switching circuit 57 to be grounded.

35 is a schematic diagram showing the relationship between the S parameter (scattering parameter) and the frequency when one resonant circuit 58 is connected in parallel to the side of the first switching circuit 55 shown in FIG. Here, it is assumed that when the antenna structure 500 does not increase the resonant circuit 58 shown in FIG. 33, the antenna structure 500 operates in the first mode (refer to curve S351). When the antenna structure 500 increases the resonant circuit 58, the resonant circuit 58 can cause the metal long arm T1 to additionally resonate to a narrow frequency mode (ie, a third mode, see curve S352) to generate The radiation signal of the third frequency band can effectively increase the application frequency band of the antenna structure 500 to achieve multi-frequency or broadband application.

FIG. 36 is a schematic diagram showing the relationship between the S parameter (scattering parameter) and the frequency when one resonant circuit 58 is connected in parallel to the first switching element 553 side of the first switching circuit 55 shown in FIG. Here, it is assumed that when the antenna structure 500 does not increase the resonant circuit 58 shown in FIG. 34, the antenna structure 500 can operate in the first mode (refer to curve S361). Thus, when the antenna structure 500 increases the resonant circuit 58, the resonant circuit 58 can cause the metal long arm T1 to additionally resonate out of the narrow frequency mode (refer to curve S362), thereby effectively increasing the The application frequency band of the antenna structure 500 can reach multi-frequency or broadband applications. In addition, by setting the inductance value of the inductance L1-Ln in the resonant circuit 58 and the capacitance value of the capacitance C1-Cn, the frequency band of the narrow-band mode when the first mode is switched can be determined. For example, in one embodiment, for example, as shown in FIG. 36, when the first switching unit 551 is switched to a different first switching element 553 by setting the inductance value and the capacitance value in the resonant circuit 58 The narrowband mode of the antenna structure 500 is also switched, for example, from f1 to fn, and the range of motion is very wide.

It can be understood that, in another embodiment, the frequency band of the narrowband mode can be fixed by setting the inductance value and the capacitance value in the resonant circuit 58, so that the first switching unit 551 is switched to Which first switching element 553, the frequency band of the narrowband mode is fixed.

Of course, it can be understood that in other embodiments, the resonant circuit 58 is not limited to include the inductor L and the capacitor C, and may also be composed of other resonant components.

37 is a schematic diagram of current flow when the antenna structure 500 is provided with the resonant circuit 58 and operates in a low frequency mode. Obviously, when current enters the metal long arm T1 from the first feed source 53, it will flow through the metal long arm T1 and flow to the break point 520 (refer to the path I3), thereby exciting the The first mode is to generate a radiation signal of the first frequency band. In addition, since the antenna structure 500 is provided with the first switching circuit 55 and the second switching circuit 57, the first switching circuit 55 and the second switching circuit 57 can cooperate with each other to switch the metal long arm T1. The low frequency mode does not affect the operation of medium and high frequencies. In this embodiment, the first mode is a low frequency mode, and the first frequency band is a frequency band of 704-960 MHz.

38 is a schematic diagram of current flow when the antenna structure 500 is provided with the resonant circuit 58 and operates in a medium-high frequency band. Obviously, when current enters the metal short arm T2 from the second feed source 54, current will sequentially flow through the front frame 511, the second side portion 517, and flow to the back plate 512 of the back surface (reference path I4), in turn, exciting the second mode to generate a radiation signal of the second frequency band. At the same time, when a current enters the metal short arm T2 from the second feed source 54, the current will be coupled to the metal long arm T1 via the breakpoint 520 and flow to the first switching circuit 55. The internal resonant circuit 58 eventually flows to the backing plate 512 (see path I5). Thus, by the coupling of the breakpoint 520, and in conjunction with the resonant circuit 58, the third mode is excited to generate a third band of radiation signals. In this embodiment, the second mode is an intermediate frequency mode, and the second frequency band is a frequency band of 1710-2400 MHz. The third mode is a high frequency mode, and the third frequency band is a frequency band of 2400-2690 MHz.

39 is a graph of S-parameters (scattering parameters) when the antenna structure 500 operates in a low frequency mode. The curve S391 is the S11 value when the antenna structure 500 operates in the 704-746 MHz frequency band. Curve S392 is the S11 value at which the antenna structure 500 operates at 746-787 MHz. Curve S393 is the S11 value when the antenna structure 500 operates in the 824-894 MHz band. Curve S394 is the S11 value when the antenna structure 500 operates in the 880-960 MHz band. Obviously, the curves S391-S394 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the first switching circuit 55 and the second switching circuit 57 can switch.

40 is a graph showing the radiation efficiency of the antenna structure 500 when operating in a low frequency mode. The curve S401 is the radiation efficiency when the antenna structure 500 operates in the 704-746 MHz frequency band. Curve S402 is the radiation efficiency of the antenna structure 500 operating at 746-787 MHz. Curve S403 is the radiation efficiency of the antenna structure 500 operating in the 824-894 MHz band. Curve S404 is the radiation efficiency of the antenna structure 500 operating in the 880-960 MHz band. Obviously, the curves S401-S404 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the first switching circuit 55 and the second switching circuit 57 can switch.

41 is a graph of S-parameters (scattering parameters) when the antenna structure 500 operates in the middle and high frequency bands (ie, 1710-2690 MHz). Figure 42 is a graph showing the radiation efficiency of the antenna structure 500 when operating in the middle and high frequency bands (i.e., 1710-2690 MHz).

Obviously, as can be seen from FIG. 39 to FIG. 42, the antenna structure 500 can operate in corresponding low frequency bands, such as the 704-746 MHz band, the 746-787 MHz band, the 824-894 MHz band, and the 880-960 MHz band. In addition, the antenna structure 500 can also operate in the medium and high frequency bands (1710-2690 MHz), that is, cover low to medium, high frequency, wide frequency range, and when the antenna structure 500 operates in the above frequency band, The operating frequency can meet the antenna design requirements and has better radiation efficiency.

Please refer to FIG. 43 as an antenna structure 500a according to a fourth preferred embodiment of the present invention. The antenna structure 500a includes a housing 51, a first feed source 53, a second feed source 54, a first switching circuit 55, and a second switching circuit 57. The housing 51 includes a front frame 511, a back plate 512, and a frame 513. The frame 513 includes at least a tip portion 515, a first side portion 516, and a second side portion 517. The frame 513 is further provided with a slot 519, and the front frame 511 is further provided with a break point 520. The break point 520 divides the front frame 511 into two parts, and the two parts include a metal long arm T1 and a metal short arm T2.

It can be understood that the antenna structure 500a is different from the antenna structure 500 in that the antenna structure 500a further includes a first radiator 61, a third feed source 62, a partition 63, a second radiator 64, and a fourth feed. Source 65.

It can be understood that the first radiator 61 is disposed in the accommodating space 514 surrounded by the casing 51 and disposed adjacent to the metal short arm T2 and spaced apart from the back plate 512. The first radiator 61 includes a first radiating portion 610, a second radiating portion 611, and a third radiating portion 612. The first radiating portion 610 is substantially L-shaped and includes a first radiating arm 613 and a second radiating arm 614. The first radiating arm 613 has a substantially straight strip shape, one end of which is electrically connected to the partition portion 63, and is parallel to the end portion 515 and parallel to the back plate 512 and adjacent to the first side portion 516. extend. The second radiating arm 614 is substantially straight and is disposed non-coplanar with the first radiating arm 613. Specifically, the second radiating arm 614 is vertically connected to an end of the first radiating arm 613 near the first side portion 516 and extends in a direction perpendicular and away from the back plate 512.

The second radiating portion 611 is substantially U-shaped, and includes a first radiating section 615, a second radiating section 616, and a third radiating section 617 that are electrically connected in sequence. The first radiating section 615, the second radiating section 616, and the third radiating section 617 are disposed coplanarly and disposed in a plane parallel to a plane in which the first radiating arm 613 is located. The first radiating section 615 is substantially straight and disposed parallel to the end portion 515. One end of the first radiating section 615 is perpendicularly connected to an end of the second radiating arm 614 away from the first radiating arm 613 and extends in a direction close to the first side portion 516. The second radiating section 616 has a straight strip shape, one end of which is perpendicularly connected to the end of the first radiating section 615 away from the second radiating arm 614, and the other end is parallel to the second side 517 and away from the The end portion 515 extends in the direction of the end portion 515, and further forms an L-shaped structure with the first radiating portion 615. The third radiating section 617 has a substantially rectangular strip shape, one end of which is connected to the second radiating section 616 away from one end of the first radiating section 615, and the other end is parallel to the first radiating section 615 and close to the The second radiating section 517 and the first radiating section 615 are respectively disposed on the same side of the second radiating section 616, and are respectively disposed on the second radiating section 616. Both ends.

The third radiating portion 612 is substantially L-shaped and includes a first connecting portion 618 and a second connecting portion 619. The first connecting section 618 has a substantially rectangular strip shape, one end of which is electrically connected to the junction of the second radiating arm 614 and the first radiating section 615, and the other end of which is parallel to the second radiating section 616 and close to the The direction of the third radiant section 617 extends until the third radiant section 617 is crossed. The second connecting section 619 is substantially straight, and one end thereof is perpendicularly connected to the first connecting section 618 away from one end of the first radiating section 615, and the other end is parallel to the first radiating section 615 and close to the first The direction of the second radiant section 616 extends until it is substantially flush with the end of the third radiant section 617.

One end of the third feed source 62 is for electrically connecting to the first radiator 61 by a matching circuit (not shown), for example, the first connecting portion 618 of the first radiator 61, and the other end is electrically Connected to the isolation portion 63 for respectively feeding current to the second radiating portion 611 and the third radiating portion 612, thereby exciting corresponding operating modes, such as WIFI 2.4 GHz mode and WIFI 5 GHz mode.

It can be understood that, in this embodiment, since the frequency bands of the resonance of the second feed source 54 and the third feed source 62 are relatively close, the antenna isolation is easily caused. Therefore, the isolation portion 63 is configured to extend the structure current paths of the two feed sources, that is, the second feed source 54 and the third feed source 62, to raise the metal short arm T2 and the first radiation. The isolation between the bodies 61.

It can be understood that the partition portion 63 can be any shape and size, or a flat metal piece, or a metal shell or the like, and only needs to ensure that the partition portion 63 can extend the second feed source 54 and The current path of the third feed source 62 is configured to improve the isolation between the metal short arm T2 and the first radiator 61. For example, in the embodiment, the partition portion 63 has a block shape and is disposed on the back plate 512 and extends from the second side portion 517 toward the first side portion 516. In other embodiments, the partition 63 may be disposed on the middle frame.

The second radiator 64 is disposed in the accommodating space 514 surrounded by the casing 51 and disposed adjacent to the metal long arm T1 and spaced apart from the back plate 512. In the present embodiment, the second radiator 64 is substantially straight and is disposed in parallel with the end portion 515. One end of the second radiator 64 is connected to a position of the front frame 511 near the first feed source 53 and the other end extends toward the second side portion 517. The fourth feed source 65 is disposed on the front frame 511 and electrically connected to the second radiator 64 for feeding current to the second radiator 64.

It can be understood that when the antenna structure 500a is operated in the low-frequency mode, the current direction is consistent with the current direction when the antenna structure 500 operates in the low-frequency mode. For details, refer to FIG. 37, and details are not described herein again.

It can be understood that FIG. 44 is a schematic diagram of current flow when the antenna structure 500a operates in the 1710-2400 MHz frequency band. Obviously, when current enters the metal short arm T2 from the second feed source 54, current will sequentially flow through the front frame 511, the second side portion 517, and flow to the back plate 512 of the back surface (reference path I6), in turn exciting the second mode to generate a radiation signal of the second frequency band. At the same time, when a current enters the metal short arm T2 from the second feed source 54, the current will be coupled to the metal long arm T1 via the breakpoint 520 and flow to the first switching circuit 55. The internal resonant circuit 58 eventually flows to the backing plate 512 (see path I7). Thus, by the coupling of the breakpoint 520, and in conjunction with the resonant circuit 58, the third mode is excited to generate a third band of radiation signals. In this embodiment, the second mode is an intermediate frequency mode, and the second frequency band is a frequency band of 1710-2170 MHz. The third mode is a high frequency mode, and the third frequency band is a frequency band of 2300-2400 MHz (ie, LTE-A Band 40 band).

45 is a schematic diagram of current flow when the antenna structure 500a operates in a dual-frequency WIFI mode. Obviously, when current enters the first radiator 61 from the third feed source 62, current will sequentially flow through the first radiation segment 615, the second radiation segment 616, and the third radiation segment 617 (refer to path I8). And inducing a corresponding fourth mode to generate a radiation signal of the fourth frequency band. In this embodiment, the fourth mode is a WIFI 2.4 GHz mode. In addition, after the current enters the first radiator 61 from the third feed source 62, it will also flow through the first connection segment 618 and the second connection segment 619 (refer to the path I9), thereby exciting the corresponding Five modes to generate the radiation signal of the fifth frequency band. In this embodiment, the fifth mode is a WIFI 5 GHz mode.

Please refer to 46 for a schematic diagram of the current trend when the antenna structure 500a operates in the 2496-2690 MHz frequency band. Obviously, when the current enters the second radiator 64 from the fourth feed source 65, it flows to the second radiator 64 away from one end of the fourth feed source 65 (refer to the path I10), and further The sixth mode is excited to generate a radiation signal of the sixth frequency band. In this embodiment, the sixth mode is a high frequency mode.

It can be understood that when the antenna structure 500a operates in a low frequency mode, its S parameter (scattering parameter) graph and the radiation efficiency map are both S parameter (scattering parameter) curve when the antenna structure 500 operates in a low frequency mode. The figure and the radiation efficiency diagram are consistent. For details, refer to FIG. 39 and FIG. 40, and details are not described herein again.

47 is a graph of S-parameters (scattering parameters) when the antenna structure 500a operates in the 1710-2170 MHz band and the 2300-2400 MHz band (ie, the LTE-A intermediate frequency band and the Band 40 band). 48 is a graph showing the radiation efficiency of the antenna structure 500a when it operates in the 1710-2170 MHz band and the 2300-2400 band (ie, the LTE-A intermediate frequency band and the Band 40 band).

FIG. 49 is a graph of S parameters (scattering parameters) when the antenna structure 500a operates in the WIFI 2.4 GHz band and the WIFI 5 GHz band. Figure 50 is a graph showing the radiation efficiency of the antenna structure 500a when operating in the WIFI 2.4 GHz band and the WIFI 5 GHz band.

Figure 51 is a graph of S-parameters (scattering parameters) when the antenna structure 500a operates in the LTE-A Band 41 mode (2496-2690 MHz). Figure 52 is a graph showing the radiation efficiency of the antenna structure 500a when operating in the LTE-A Band 41 mode (2496-2690 MHz).

Obviously, from FIG. 39 to FIG. 40, and FIG. 47 to FIG. 52, the antenna structure 500a can operate in corresponding low frequency bands, such as the 704-746 MHz band, the 746-787 MHz band, the 824-894 MHz band, and the 880-960 MHz band. . In addition, the antenna structure 500a can also operate in the middle frequency band (1710-2170MHz), the high frequency frequency band (2300-2400MHz and 2496-2690MHz), and the WIFI 2.4/5GHz dual frequency band, that is, cover to low, medium, high frequency, WIFI. The 2.4/5 GHz dual frequency has a wide frequency range, and when the antenna structure 500a operates in the above frequency band, its operating frequency can meet the antenna working design requirements and has better radiation efficiency.

Please refer to FIG. 53, which is an antenna structure 500b according to a fifth preferred embodiment of the present invention. The antenna structure 500b includes a housing 51, a first feed source 53, a second feed source 54, a first switching circuit 55, a second switching circuit 57, a first radiator 61, a third feed source 62, and isolation. The portion 63, the second radiator 64, the fourth feed source 65, and the third switching circuit 66. The housing 51 includes a front frame 511, a back plate 512, and a frame 513. The frame 513 includes at least a tip portion 515, a first side portion 516, and a second side portion 517. The frame 513 is further provided with a slot 519, and the front frame 511 is further provided with a break point 520. The break point 520 divides the front frame 511 into two parts, and the two parts include a metal long arm T1 and a metal short arm T2.

It can be understood that the antenna structure 500b is different from the antenna structure 500a in that the antenna structure 500b further includes a third switching circuit 66. One end of the third switching circuit 66 is electrically connected to the second radiator 64, and the other end is electrically connected to the backing plate 512, that is, grounded. The third switching circuit 66 is used to adjust the frequency band of the high frequency mode of the second radiator 64. For the specific circuit structure and working principle, refer to the description of the first switching circuit 55 of FIG. 30, and details are not described herein.

It can be understood that when the antenna structure 500b is operated in the low frequency mode, the current direction is consistent with the current direction when the antenna structure 500 operates in the low frequency mode. For details, refer to FIG. 37, and details are not described herein.

It can be understood that FIG. 54 is a schematic diagram of current flow when the antenna structure 500b operates in the 1710-2170 MHz frequency band. Obviously, when current enters the metal short arm T2 from the second feed source 54, current will sequentially flow through the front frame 511, the second side portion 517, and flow to the back plate 512 of the back surface (reference path I11), which in turn excites the second mode to generate a radiation signal of the second frequency band. At the same time, when a current enters the metal short arm T2 from the second feed source 54, the current will be coupled to the metal long arm T1 via the breakpoint 520 and flow to the first switching circuit 55. The internal resonant circuit 58 eventually flows to the backing plate 512 (see path I12). Thus, by the coupling of the breakpoint 520, and in conjunction with the resonant circuit 58, the third mode is excited to generate a third band of radiation signals. In this embodiment, the second mode is an intermediate frequency mode, and the second frequency band is a 1710-1990 MHz frequency band. The third mode is an intermediate frequency mode, and the third frequency band is a frequency band of 2110-2170 MHz.

It can be understood that when the antenna structure 500b operates in the dual-frequency WIFI mode, the current direction is consistent with the current direction when the antenna structure 500a operates in the dual-frequency WIFI mode. For details, refer to FIG. 45, Narration.

Please refer to 55 for a schematic diagram of current flow when the antenna structure 500b operates in the 2300-2400 MHz and 2496-2690 MHz frequency bands. Obviously, when the current enters the second radiator 64 from the fourth feed source 65, it flows to the second radiator 64 away from one end of the fourth feed source 65 (refer to the path I13), and further The sixth mode is excited to generate a radiation signal of the sixth frequency band. In this embodiment, the sixth mode is a high frequency mode. In addition, since the antenna structure 500b is provided with a grounded third switching circuit 66, the high frequency mode can be switched by the third switching circuit 66, for example, the antenna structure 500b can be switched to the 2300-2400 MHz frequency band and/or Or the LTE-A Band 41 band (2496-2690 MHz), and the high frequency mode is coexisted with the intermediate frequency mode and the LTE-A Band 40 mode.

It can be understood that when the antenna structure 500b operates in a low frequency mode, its S parameter (scattering parameter) graph and the radiation efficiency map are both S parameter (scattering parameter) curve when the antenna structure 500 operates in a low frequency mode. The figure and the radiation efficiency diagram are consistent. For details, refer to FIG. 39 and FIG. 40, and details are not described herein again.

Figure 56 is a graph of S-parameter (scattering parameters) when the antenna structure 500b operates in the 1710-2170 MHz band. Figure 57 is a graph showing the radiation efficiency of the antenna structure 500b operating in the 1710-2170 MHz band.

It can be understood that when the antenna structure 500b operates in the WIFI 2.4 GHz band and the WIFI 5 GHz band, the S parameter (scattering parameter) graph and the radiation efficiency map are both working with the antenna structure 500a in the WIFI 2.4 GHz band and the WIFI 5 GHz. The S-parameter (scattering parameter) graph and the radiation efficiency graph are consistent in the frequency band. For details, refer to FIG. 49 and FIG. 50, and details are not described herein again.

Figure 58 is a graph of S-parameters (scattering parameters) of the antenna structure 500b operating in the 2300-2400 MHz and 2496-2690 MHz bands. Figure 59 is a graph showing the radiation efficiency of the antenna structure 500b operating in the 2300-2400 MHz and 2496-2690 MHz bands.

As described in the foregoing embodiments, the metal long arm T1 can excite the first mode to generate a radiation signal in a low frequency band, and the metal short arm T2 can excite the second mode and the third mode to generate an intermediate frequency band and a high frequency band. The radiation signal, the second radiator 64 can excite the sixth mode to generate a radiation signal in the high frequency band. Therefore, the wireless communication device 600 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands to increase the transmission bandwidth by using Carrier Aggregation (CA) technology of LTE-Advanced. More specifically, the wireless communication device 600 can use the carrier aggregation technology and use the metal long arm T1, the metal short arm T2 and the second radiator 64 to receive or transmit wireless signals simultaneously in a plurality of different frequency bands. .

It can be understood that in other embodiments, the positions of the first radiator 61 and the second radiator 64 and the third switching circuit 66 are interchangeable, and the position of the isolation portion 63 is unchanged. Specifically, the first radiator 61 is disposed in the accommodating space 514 surrounded by the casing 51, and has a shape that is bilaterally symmetrical (left and right) as shown in FIG. 17 and disposed adjacent to the metal long arm T1. The first radiating arm 613 of the first radiator 61 is electrically connected to one end of the partition portion 63 to be electrically connected to the front frame 511. The third feed source 62 is disposed on the metal front frame 511 and electrically connected to the first connecting portion 618 of the first radiator 61.

One end of the second radiator 64 is connected to the partition 63 and the other end extends toward the first side 516. One end of the fourth feed source 65 is electrically connected to the second radiator 64 by a matching circuit (not shown), and the other end is electrically connected to the isolation portion 63 for the second radiator 64 feed current. One end of the third switching circuit 66 is electrically connected to the second radiator 64, and the other end is connected to the backing plate 512.

In addition, the slot 519 and the break point 520 of the housing 51 are disposed on the front frame 511 and the frame 513, and are not disposed on the back plate 512, so that the back plate 512 forms an all-metal structure. That is, there is no insulating slot, break or break point on the back plate 512, so that the back plate 512 can avoid the integrity and beauty of the back plate 512 due to the setting of slotting, disconnection or breakpoint. Sex.

Example 6-7

Referring to FIG. 60, a sixth preferred embodiment of the present invention provides an antenna structure 700 that can be applied to a wireless communication device 800 such as a mobile phone or a personal digital assistant for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to FIG. 61 and FIG. 62 together, the antenna structure 700 includes a housing 71, a first feed source S1, a first radiator 73, a first switching circuit 75, a second switching circuit 76, and a second radiator 78. The second feed source S2 and the third switching circuit 79. The housing 71 can be the outer casing of the wireless communication device 800. In the present embodiment, the housing 71 is made of a metal material. The housing 71 includes a front frame 711, a back plate 712, and a frame 713. The front frame 711, the back plate 712 and the frame 713 may be integrally formed. The front frame 711, the back plate 712, and the bezel 713 constitute an outer casing of the wireless communication device 800. The front frame 711 is provided with an opening (not labeled) for accommodating the display unit 801 of the wireless communication device 800. It can be understood that the display unit 801 has a display plane exposed to the opening, and the display plane is disposed substantially parallel to the back plate 712.

The back plate 712 is disposed opposite to the front frame 711. The back plate 712 is directly connected to the frame 713, and there is no gap between the back plate 712 and the frame 713. The back plate 712 is an integrally formed single metal piece. The back plate 712 is provided with openings 806 and 807 for exposing components such as the camera lens 804 and the flash 805. The back plate 712 is not provided with any for dividing. The insulation of the backing plate 712 is slotted, broken or broken (see Figure 62). The backplane 712 can serve as the ground structure 700 and the wireless communication device 800.

In another embodiment, a shielding mask for shielding electromagnetic interference or supporting a frame in the display unit 801 may be disposed on a side of the display unit 801 facing the backing plate 712. The shield or the middle frame is made of a metal material. The shield or middle frame can be coupled to the backplane 712 to serve as the ground structure 700 and the wireless communication device 800.

The frame 713 is disposed between the front frame 711 and the back plate 712, and is disposed around the periphery of the front frame 711 and the back plate 712 to be opposite to the display unit 801 and the front The frame 711 and the back plate 712 together form an accommodating space 714. The accommodating space 714 is configured to receive electronic components or circuit modules of the circuit board, the processing unit, and the like of the wireless communication device 800.

The bezel 713 includes at least a tip end portion 715, a first side portion 716, and a second side portion 717. In the embodiment, the end portion 715 is the bottom end of the wireless communication device 800. The distal end portion 715 connects the front frame 711 and the back plate 712. The first side portion 716 is disposed opposite to the second side portion 717, and is disposed at two ends of the end portion 715, preferably vertically. The first side portion 716 and the second side portion 717 are also connected to the front frame 711 and the back plate 712.

The frame 713 is further provided with a port 718 and a slot 719, and the front frame 711 is provided with a break point 720. The port 718 is opened at a position intermediate the end portion 715 and penetrates the end portion 715. The wireless communication device 800 also includes an electronic component 803. In this embodiment, the electronic component 803 is a USB module disposed in the accommodating space 714 and corresponding to the port 718 such that the electronic component 803 is from the port 718 portion. Exposed. Thus, the user can insert a USB device through the port 718 to establish an electrical connection with the electronic component 803.

In the embodiment, the slot 719 is disposed on the end portion 715 and communicates with the port 718 and extends to the first side portion 716 and the second side portion 717, respectively. It can be understood that in other embodiments, the slot 719 can also be disposed only at the end portion 715 without extending to any one of the first side portion 716 and the second side portion 717, or A slot 719 is disposed in the end portion 715 and extends only along one of the first side portion 716 and the second side portion 717.

The break point 720 is in communication with the slot 719 and extends to block the front frame 711. In the present embodiment, the break point 720 is disposed adjacent to the second side portion 717, such that the break point 720 divides the front frame 711 into two parts, namely a metal long arm F1 and a metal short arm F2. The portion 711 of the break point 720 is extended to a portion corresponding to one of the end points D1 of the slot 719 to form the metal long arm F1. The other side of the breakpoint 720 is preceded by the frame 711 until it extends to a portion corresponding to the other end D2 of the slot 719 to form the metal short arm F2. In this embodiment, the position where the break point 720 is opened does not correspond to the middle of the end portion 715, so the length of the metal long arm F1 is greater than the length of the metal short arm F2. In addition, the slot 719 and the break point 720 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto), thereby separating the metal long arm F1. The metal short arm F2 and the back plate 712.

It can be understood that, in this embodiment, the slot 719 is defined in the frame 713 near one end of the back plate 712 and extends to the front frame 711 such that the metal long arm F1 and the metal short arm F2 is completely constituted by a part of the front frame 711. Of course, in other embodiments, the opening position of the slot 719 can also be adjusted according to specific needs. For example, the slot 719 is opened at one end of the frame 713 near the back plate 712 and extends toward the front frame 711 such that the metal long arm F1 and the metal short arm F2 are partially described. The front frame 711 and a part of the frame 713 are formed.

It can be understood that the front frame 711 and the lower half of the frame 713 are not provided with other insulating slots, broken lines or break points except the port 718, the slot 719 and the break point 720, so the front frame 711 There is only one breakpoint 720 in the lower half, and there are no other breakpoints.

In the embodiment, the first feed source S1 is disposed in the accommodating space 714 and located between the electronic component 803 and the second side portion 717. The first feed source S1 is electrically connected to the first radiator 73 for feeding current to the first radiator 73.

The first radiator 73 is disposed in the accommodating space 714 and located between the electronic component 803 and the second side portion 717. The first radiator 73 includes a first radiating portion 731 and a second radiating portion 733. One end of the first radiating portion 731 is electrically connected to the first feeding source S1 by a matching circuit 81, and the other end is spaced apart from the metal long arm F1. Thus, when a current is fed from the first feed source S1, current will flow through the matching circuit 81 and the first radiating portion 731, and then to the metal long arm F1. The first radiating portion 731 and the metal long arm F1 form a coupling structure to couple with each other to resonantly excite a first mode to generate a radiation signal of the first frequency band. In this embodiment, the first mode is an LTE-A low frequency mode, and the first frequency band is a 704-960 MHz frequency band.

In the embodiment, the first radiating portion 731 includes a first radiating section 734, a second radiating section 735, and a third radiating section 736. The first radiating section 734, the second radiating section 735, and the third radiating section 736 are disposed in a coplanar manner. The first radiating section 734 has a substantially rectangular strip shape, one end of which is electrically connected to the first feeding source S1 by the matching circuit, and the other end is parallel to the end portion 715 and close to the electronic component 803. The direction extends until the breakpoint 720 is crossed. The second radiating section 735 has a substantially rectangular strip shape, one end of which is vertically connected to the first radiating section 734 away from one end of the first feeding source S1, and the other end is parallel to the second side part 717 and close to The metal long arm F1 extends in the direction, and further forms an L-shaped structure with the first radiating section 734. The third radiant section 736 is substantially rectangular strip-shaped. The third radiating section 736 is spaced apart from and parallel with the metal long arm F1. The third radiating section 736 is perpendicularly connected to the end of the second radiating section 735 away from the first radiating section 734 and extends in a direction close to the first side portion 716 and the second side portion 717, respectively. Further, the second radiating section 735 is configured to have a substantially T-shaped structure.

In this embodiment, the second radiating portion 733 is a capacitor. One end of the second radiating portion 733 is electrically connected to the junction of the matching circuit of the first feeding source S1 and the first radiating section 734, and the other end is electrically connected to the metal short arm F2. Thus, when a current is fed from the first feed source S1, a current will flow through the second radiating portion 733, and then flow into the metal short arm F2, so that the metal short arm F2 excites a second mode. State to generate a radiation signal of the second frequency band. In this embodiment, the second mode is an LTE-A intermediate frequency mode, and the second frequency band is a 1710-1990 MHz frequency band. In addition, a current flowing through the second radiating portion 733 and the metal short arm F2 is also coupled to the metal long arm F1 by the break point 720, thereby exciting a third mode to generate a third frequency band. Radiation signal. In this embodiment, the third mode is another LTE-A intermediate frequency mode, and the third frequency band is a 2110-2170 MHz frequency band. As such, the second mode and the third mode will constitute a wideband resonance application, namely the 1710-2170 band.

Referring to FIG. 63 together, the first switching circuit 75 is electrically connected to the middle position of the metal long arm F1, and includes a first switching unit 751 and at least one first switching element 753. The first switching unit 751 is electrically connected to the metal long arm F1. The first switching element 753 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 753 are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit 751, and the other end is electrically connected to the backing plate 712, that is, grounded.

Referring to FIG. 64, one end of the matching circuit 81 is electrically connected to the first feeding source S1, and the other end of the matching circuit 81 is electrically connected to the first radiating portion 731. One end of the second switching circuit 76 is electrically connected to the matching circuit 81, and the other end is electrically connected to the backplane 712, that is, grounded. In the embodiment, the second switching circuit 76 includes a second switching unit 761 and at least one second switching element 763. The second switching unit 761 is electrically connected to the matching circuit 81 to be electrically connected to the first radiating portion 81 by the matching circuit 81. The second switching element 763 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 763 are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit 761, and the other end is electrically connected to the backing plate 712, that is, grounded. Thus, by controlling the switching between the first switching unit 751 and the second switching unit 761, the metal long arm F1 can be switched to different first switching elements 753 and/or second switching elements 763. Since each of the first switching element 753 and the second switching element 763 has different impedances, the first mode of the metal long arm F1 can be adjusted by switching between the first switching unit 751 and the second switching unit 761. The frequency band of the state. The adjustment band described in the item is to shift the band to a low frequency or to a high frequency. It can be understood that the first switching circuit 75 and the second switching circuit 76 can be switched individually or together.

As can be understood, referring to FIG. 65, in one embodiment, the first switching circuit 75 further includes a resonant circuit 77. The number of the resonant circuits 77 is one, and the resonant circuit 77 includes inductors connected in series. L and capacitor C. The resonant circuit 77 is electrically connected between the metal long arm F1 and the back plate 712, and is disposed in parallel with the first switching unit 751 and the at least one first switching element 753. Referring to FIG. 66, in another embodiment, the number of the resonant circuits 77 is the same as the number of the first switching elements 753, that is, a plurality. Each of the resonant circuits 77 includes inductors L1-Ln and capacitors C1-Cn connected in series with each other. Each of the resonant circuits 77 is electrically connected to the first switching unit 751 and the backplane 712, respectively, and is disposed in parallel with the corresponding first switching element 753.

In FIGS. 63, 64, 65, and 66, the shield or middle frame may replace the back plate 712 for grounding the first switching circuit 75 and/or the second switching circuit 76.

67 is a relationship between the S parameter (scattering parameter) and the frequency when the first switching unit 751 of the first switching circuit 75 shown in FIG. 65 has a resonant circuit 77 connected in parallel with the first switching element 753 side. Schematic. Here, it is assumed that when the antenna structure 700 does not increase the resonant circuit 77 shown in FIG. 65, the antenna structure 700 operates in the first mode (refer to curve S671). When the antenna structure 700 increases the resonant circuit 77, the resonant circuit 77 may cause the metal long arm F1 to cooperate with the breakpoint 720 to additionally resonate to a narrow frequency mode (third mode, ie, 2110) -2170MHz frequency band, please refer to curve S672) to generate the third frequency band radiation signal, which can effectively increase the application frequency band of the antenna structure 700 to achieve multi-frequency or broadband application.

68 is a schematic diagram showing the relationship between the S parameter (scattering parameter) and the frequency when one resonant circuit 77 is connected in parallel to the first switching element 753 side of the first switching circuit 75 shown in FIG. Here, it is assumed that when the antenna structure 700 does not increase the resonant circuit 77 shown in FIG. 66, the antenna structure 700 can operate in the first mode (refer to curve S681). Thus, when the antenna structure 700 increases the resonant circuit 77, the resonant circuit 77 can cause the metal long arm F1 to cooperate with the breakpoint 720 to additionally resonate the narrow frequency mode (refer to curve S682). That is, the 2110-2170MHz frequency band can effectively increase the application frequency band of the antenna structure 700 to achieve multi-frequency or broadband applications.

In addition, by setting the inductance value of the inductance L1-Ln in the resonant circuit 77 and the capacitance value of the capacitance C1-Cn, the frequency band of the narrow-band mode at the first mode switching can be determined. For example, in one embodiment, as shown in FIG. 68, when the first switching unit 751 is switched to a different first switching element 753 by setting the inductance value and the capacitance value in the resonant circuit 77, The narrow-band mode of the antenna structure 700 is also switched, for example, from f1 to fn, and the range of motion is very wide.

It can be understood that, in another embodiment, the frequency band of the narrowband mode can be fixed by setting the inductance value and the capacitance value in the resonant circuit 77, so that the first switching unit 751 is switched to Which first switching element 753, the frequency band of the narrowband mode is fixed.

Of course, it can be understood that in other embodiments, the resonant circuit 77 is not limited to include the inductor L and the capacitor C, and may also be composed of other resonant components.

In the embodiment, the second radiator 78 is disposed in the accommodating space 714 surrounded by the casing 71 and disposed adjacent to the metal long arm F1 and spaced apart from the back plate 712. In the present embodiment, the second radiator 78 is substantially straight and is disposed in parallel with the end portion 715. One end of the second radiator 78 is connected to a position of the front frame 711 near the end portion D1, and the other end extends toward the second side portion 717. The second feed source S2 is disposed on the front frame 711 and electrically connected to the second radiator 78 for feeding current to the second radiator 78. As such, when the current enters from the second feed source S2, it will flow through the second radiator 78, thereby causing the second radiator 78 to excite a fourth mode to generate a radiation signal of the fourth frequency band. . In this embodiment, the fourth mode is an LTE-A high frequency mode, and the fourth frequency band is a 2300-2400 MHz frequency band and a 2496-2690 MHz frequency band.

One end of the third switching circuit 79 is electrically connected to the middle of the second radiator 78, the other end is electrically connected to the back plate 712, or is electrically connected to the shield or the middle frame, that is, grounded. The third switching circuit 79 is used to adjust the frequency band of the high frequency mode of the second radiator 78. The specific circuit structure and working principle can be referred to the description of the first switching circuit 75 of FIG. 63, and details are not described herein again.

FIG. 69 is a schematic diagram of current flow when the antenna structure 700 operates in a low frequency mode. Obviously, when current enters from the first feed source S1, it will sequentially flow through the first radiating section 734, the second radiating section 735, and the third radiating section 736 of the first radiating portion 731, and The third radiating section 736 is coupled to the metal long arm F1, flows from the metal long arm F1 through the first side portion 716, and finally flows to the back side back plate 712 (refer to path J1), thereby exciting The first mode is to generate a radiation signal of the first frequency band. In addition, since the antenna structure 700 is provided with the first switching circuit 75 and the second switching circuit 76, the first switching circuit 75 and the second switching circuit 76 can cooperate with each other to switch the metal long arm F1. The low frequency mode does not affect the operation of medium and high frequencies.

FIG. 70 is a schematic diagram of current flow when the antenna structure 700 operates in an intermediate frequency mode (1710-2170 MHz band and 2110-2170 MHz band). Obviously, when a current enters from the first feed source S1, current will flow directly into the metal short arm F2 via the second radiating portion 733, flow through the second side portion 717, and finally flow into the back side. The backplane 712 (refer to path J2) in turn excites the second mode to generate a radiation signal of the second frequency band. At the same time, when current enters from the first feed source S1, current will flow into the metal short arm F2 via the second radiating portion 733, and then coupled to the metal long arm F1 via the break point 720, and flow. The resonant circuit 77 in the first switching circuit 75 finally flows to the back plate 712 on the back side (refer to path J3). Thus, by the coupling of the breakpoint 720 and the resonant circuit 77, the metal long arm F1 is excited to excite the third mode to generate a radiation signal of the third frequency band. It will be apparent from FIG. 63 and FIG. 70 that the backing plate 712 corresponds to the ground of the antenna structure 700.

71 is a schematic diagram of current flow when the antenna structure 700 operates in a high frequency mode (2300-2400 MHz band and 2496-2690 MHz band). When the current enters the second radiator 78 from the second feeding source S2, the current is directed to the second radiator 78 away from one end of the second feeding source S2 (refer to the path J4), and then The fourth mode is excited to generate a radiation signal of the fourth frequency band. In addition, since the antenna structure 700 is provided with a grounded third switching circuit 79, the third switching circuit 79 can be used to switch the frequency of the high frequency mode.

72 is a graph of S-parameters (scattering parameters) when the antenna structure 700 operates in a low frequency mode. The curve S721 is the S11 value when the antenna structure 700 operates at 704-746 MHz (LTE Band 17 band). Curve S722 is the S11 value when the antenna structure 700 operates at 746-787 MHz (LTE Band 13 band). Curve S723 is the S11 value when the antenna structure 700 operates at 824-894 MHz (LTE Band 5 band). Curve S724 is the S11 value when the antenna structure 700 operates at 880-960 MHz (LTE Band 8 band). Obviously, the curves S721-S724 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the first switching circuit 75 and the second switching circuit 76 can switch.

Figure 73 is a graph showing the radiation efficiency of the antenna structure 700 when operating in a low frequency mode. The curve S731 is the radiation efficiency when the antenna structure 700 operates at 704-746 MHz (LTE Band 17 band). Curve S732 is the radiation efficiency of the antenna structure 700 operating at 746-787 MHz (LTE Band 13 band). Curve S733 is the radiation efficiency of the antenna structure 700 operating at 824-894 MHz (LTE Band 5 band). Curve S734 is the radiation efficiency when the antenna structure 700 operates at 880-960 MHz (LTE Band 8 band). Obviously, the curves S731-S734 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the first switching circuit 75 and the second switching circuit 76 can switch.

74 is a graph of S-parameters (scattering parameters) when the antenna structure 700 operates in the mid-band (ie, the 1710-1990 MHz band and the 2110-2170 MHz band). Figure 75 is a graph showing the radiation efficiency of the antenna structure 700 when operating in the mid-band (i.e., the 1710-1990 MHz band and the 2110-2170 MHz band).

76 is a graph of S-parameters (scattering parameters) when the antenna structure 700 operates in a high frequency band (ie, a 2300-2400 MHz band and a 2496-2690 MHz band). 77 is a graph showing the radiation efficiency of the antenna structure 700 when operating in a high frequency band (ie, the 2300-2400 MHz band and the 2496-2690 MHz band). Obviously, when the switching unit in the third switching circuit 79 of the antenna structure 700 switches to a different switching element (for example, four different switching elements), since each switching element has a different impedance, by switching The switching of the unit can effectively adjust the frequency of the antenna structure 700 at a high frequency, thereby obtaining a better operating bandwidth.

Obviously, as can be seen from FIG. 72 to FIG. 77, the antenna structure 700 can operate in a corresponding low frequency band, such as the LTE Band 17/13/5/8 band. In addition, the antenna structure 700 can also operate in the middle frequency band (1710-1990MHz, 2110-2170MHz frequency band) and the high frequency band (ie 2300-2400MHz, 2496-2690MHz frequency band), that is, cover to low, medium, high frequency, frequency range It is wider, and when the antenna structure 700 operates in the above frequency band, its operating frequency can meet the antenna working design requirements and has better radiation efficiency.

That is, in the embodiment, the antenna structure 700 is configured by disposing the first radiator 73 and forming the first radiating portion 731 of the first radiator 73 and the metal long arm F1. The coupling structure, and the second radiating portion 733 is directly electrically connected to the metal short arm F2. That is, the first radiator 73 and the metal long arm F1 and the metal short arm F2 form a semi-coupled feeding structure, so that the metal long arm F1 and the metal short arm F2 respectively excite the corresponding first mode and The second mode. The arrangement of the semi-coupled feed structure allows the antenna structure 700 to be more flexible and can effectively reduce the non-metallic range required for the antenna structure. In addition, the antenna structure 700 can effectively adjust and switch the first mode (ie, low frequency mode) by the setting of the first switching circuit 75 and the second switching circuit 76, and the setting of the resonant circuit 77 So that the metal long arm F1 additionally resonates to an intermediate frequency mode (ie, the third mode). Furthermore, the antenna structure 700 can be configured to activate the corresponding high frequency mode by the arrangement of the second radiator 78 and the third switching circuit 79, and the antenna structure 700 can be effectively adjusted. The frequency of the high frequency, in turn, gives a better operating bandwidth.

Please refer to FIG. 78, which is an antenna structure 700a according to a seventh preferred embodiment of the present invention. The antenna structure 700a includes a housing 71, a first feed source S1, a first radiator 83, a first switching circuit 75, a second switching circuit 76, a resonant circuit 77, a second radiator 78, and a second feed source. S2 and a third switching circuit 79. The housing 71 includes a front frame 711, a back plate 712, and a frame 713. The bezel 713 includes at least a tip end portion 715, a first side portion 716, and a second side portion 717. The frame 713 is further provided with a slot 719, and the front frame 711 is further provided with a break point 720. The break point 720 divides the front frame 711 into two parts, and the two parts include a metal long arm F1 and a metal short arm F2.

The first radiator 83 includes a first radiating portion 731 and a second radiating portion 831. The first radiating portion 731 includes a first radiating section 734, a second radiating section 735, and a third radiating section 736. The third radiating section 736 is spaced apart from the metal long arm F1 so that the first radiating portion 731 and the metal long arm F1 form a coupling structure.

It can be understood that the antenna structure 700a is different from the antenna structure 700 in that the specific structure of the second radiating portion 831 in the antenna structure 700a is different from the specific structure of the second radiating portion 733 in the antenna structure 700. The connection relationship between the second radiating portion 831 and the metal short arm F2 is different from the connection relationship between the second radiating portion 733 and the metal short arm F2 in the antenna structure 700.

Specifically, in the embodiment, the second radiating portion 831 and the first radiating portion 731 are symmetrically disposed with respect to the first feeding source S1. The second radiating portion 831 includes a first coupling section 832, a second coupling section 833, and a third coupling section 834. The first coupling section 832, the second coupling section 833, and the third coupling section 834 are disposed in a coplanar manner. The first coupling section 832 has a substantially rectangular strip shape, one end of which is electrically connected to the matching circuit 81 of the first radiating section 734 and the first feeding source S1, and is parallel to the end portion 715 and close to the first The two side portions 717 extend in the same line as the first radiating portion 734. The second coupling section 833 has a substantially rectangular strip shape, one end of which is perpendicularly connected to the first coupling section 832 away from one end of the first feeding source S1, and is parallel to the second radiating section 735 and close to the The direction of the end portion 715 extends to form a Π-shaped structure together with the first radiant section 734, the second radiant section 735, and the first coupling section 832. The third coupling section 834 has a substantially rectangular strip shape which is spaced apart from and parallel with the metal short arm F2. The third coupling section 834 is electrically connected to the second coupling section 833 away from one end of the first coupling section 832 and extends in a direction close to the first side portion 716 and the second side portion 717, respectively. The second coupling section 833 constitutes a substantially T-shaped structure.

It can be understood that when the antenna structure 700a is operated in the low frequency mode, the current direction of the antenna structure 700a is consistent with the current direction when the antenna structure 700 operates in the low frequency mode. For details, refer to FIG. 69, and details are not described herein again.

79 is a schematic diagram of current flow when the antenna structure 700a operates in an intermediate frequency mode (1710-2170 MHz, 2110-2170 MHz frequency band). Obviously, when the current enters from the first feed source S1, the current will sequentially flow through the first coupling section 832, the second coupling section 833 and the third coupling section 834 of the second radiating portion 831, and The third coupling section 834 is coupled to the metal short arm F2, flows from the metal short arm F2 through the second side portion 717, and finally flows to the back surface of the back plate 712 (refer to path J5), thereby exciting The second mode is derived to generate a radiation signal of the second frequency band. At the same time, when current enters from the first feed source S1, current will be coupled to the metal short arm F2 via the third coupling section 834, and coupled to the metal long arm F1 via the breakpoint 720, and The resonant circuit 77 flowing through the first switching circuit 75 finally flows to the back plate 712 on the back side (refer to path J6). Thus, by the coupling of the breakpoint 720, and in conjunction with the resonant circuit 77, the third mode is excited to generate a radiation signal of the third frequency band.

It can be understood that when the antenna structure 700a is operated in a high-frequency mode, the current direction thereof is consistent with the current direction when the antenna structure 700 operates in a high-frequency mode. For details, refer to FIG. 71, and details are not described herein again.

Figure 80 is a graph of S-parameter (scattering parameters) when the antenna structure 700a operates in a low frequency mode. The curve S801 is the S11 value when the antenna structure 700a operates at 704-746 MHz (LTE Band 17 band). Curve S802 is the S11 value when the antenna structure 700a operates at 746-787 MHz (LTE Band 13 band). Curve S803 is the S11 value when the antenna structure 700a operates at 824-894 MHz (LTE Band 5 band). Curve S804 is the S11 value when the antenna structure 700a operates at 880-960 MHz (LTE Band 8 band). Obviously, the curves S801-S804 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the first switching circuit 75 and the second switching circuit 76 can switch.

Figure 81 is a graph showing the radiation efficiency of the antenna structure 700a when operating in a low frequency mode. The curve S811 is the radiation efficiency when the antenna structure 700a operates at 704-746 MHz (LTE Band 17 band). Curve S812 is the radiation efficiency when the antenna structure 700a operates at 746-787 MHz (LTE Band 13 band). Curve S8123 is the radiation efficiency when the antenna structure 700a operates at 824-894 MHz (LTE Band 5 band). Curve S814 is the radiation efficiency when the antenna structure 700a operates at 880-960 MHz (LTE Band 8 band). Obviously, the curves S811-S814 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the first switching circuit 75 and the second switching circuit 76 can switch.

82 is a graph of S-parameters (scattering parameters) when the antenna structure 700a operates in the mid-band (ie, the 1710-1990 MHz band and the 2110-2170 MHz band). Figure 83 is a graph showing the radiation efficiency of the antenna structure 700a when it operates in the mid-band (i.e., the 1710-1990 MHz band and the 2110-2170 MHz band).

The S-parameter (scattering parameter) and the radiation efficiency of the antenna structure 700a operating in the high frequency band (ie, the 2300-2400 MHz frequency band and the 2496-2690 MHz frequency band) are the same as the antenna structure 700. The foregoing FIG. 76 and FIG. 77 have already explained .

It can be understood that, in this embodiment, the antenna structure 700a is configured by coupling the first radiator 83 and the first radiating portion 731 of the first radiator 83 to the metal long arm F1. The second radiating portion 831 and the metal short arm F2 form a coupling structure. That is, the first radiator 83 and the metal long arm F1 and the metal short arm F2 form a fully coupled feed structure, so that the metal long arm F1 and the metal short arm F2 respectively excite the corresponding first mode and The second mode. The arrangement of the fully coupled feed structure allows the antenna structure 700 to be more flexible and can effectively reduce the non-metallic range required for the antenna structure 700a. In addition, the antenna structure 700a can effectively adjust and switch the first mode (ie, low frequency mode) by the setting of the first switching circuit 75 and the second switching circuit 76, and is set by the resonant circuit 77. So that the metal long arm F1 additionally resonates to an intermediate frequency mode (ie, the third mode). Furthermore, the antenna structure 700a can be configured to activate the corresponding high frequency mode by the arrangement of the second radiator 78 and the third switching circuit 79, and the antenna structure 700a can be effectively adjusted. The frequency of the high frequency, in turn, gives a better operating bandwidth.

As described in the foregoing embodiments, the first radiator 73/83 is coupled to the metal long arm F1, so that the metal long arm F1 can excite the first mode to generate a radiation signal in a low frequency band. . At the same time, the first radiator 73/83 is coupled or directly electrically connected to the metal short arm F2, so that the metal short arm F2 excites the second mode to generate a radiation signal of the intermediate frequency band. That is, the first radiator 73/83 can form a semi-coupling feed structure or a full-coupling feed structure with the metal long arm F1 and the metal short arm F2, so that the metal long arm F1 and the metal short arm F2 are common. Exciting the first mode and the second mode. At the same time, the metal long arm F1 and the metal short arm F2 can be coupled by the break point 720 and matched with the resonant circuit 77, so that the metal long arm F1 additionally excites the corresponding third mode. In order to generate a radiation signal in the intermediate frequency band, the second radiator 78 can excite the fourth mode to generate a radiation signal in the high frequency band. Therefore, the wireless communication device 800 can simultaneously receive or transmit wireless signals in multiple different frequency bands to increase the transmission bandwidth by using Carrier Aggregation (CA) technology of LTE-Advanced. More specifically, the wireless communication device 800 can use the carrier aggregation technique and use the metal long arm F1, the metal short arm F2, the first radiator 73/83 and the second radiator 78, at least two of which are simultaneously different. The band receives or transmits wireless signals.

The antenna structure 100 of the first preferred embodiment of the present invention, the antenna structure 200 of the second preferred embodiment of the present invention, the antenna structure 500 of the third preferred embodiment of the present invention, and the antenna structure of the fourth preferred embodiment of the present invention The antenna structure 500b of the fifth preferred embodiment of the present invention, the antenna structure 700 of the sixth preferred embodiment of the present invention, and the antenna structure 700a of the seventh preferred embodiment of the present invention are applicable to the same wireless communication device. For example, the antenna structure 100 or 200 is disposed at the upper end of the wireless communication device as a secondary antenna, and the antenna structure 500, 500a, 500b, 700 or 700a is disposed at a lower end of the wireless communication device as a primary antenna. When the wireless communication device transmits a wireless signal, the wireless communication device transmits the wireless signal using the primary antenna. When the wireless communication device receives the wireless signal, the wireless communication device uses the primary antenna to receive the wireless signal together with the secondary antenna.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

100, 200, 500, 500a, 500b, 700, 700a‧‧‧ antenna structures

11‧‧‧Metal parts

111‧‧‧Metal front frame

112‧‧‧Metal backplane

113‧‧‧Metal border

51, 71‧‧‧ shell

511, 711‧‧‧ front box

512, 712‧‧‧ backplane

513, 713‧‧‧ border

114, 514, 714‧‧‧ accommodating space

115‧‧‧ top

515, 715‧‧ ‧ end

116, 516, 716‧‧‧ first side

117, 517, 717‧‧‧ second side

518, 718‧‧‧ ports

118, 519, 719‧‧‧ slotting

119, 520, 720‧‧‧ breakpoints

A1, T1, F1‧‧‧ metal long arm

A2, T2, F2‧‧‧ metal short arm

E1, E2, D1, D2‧‧‧ endpoints

13, 53, S1‧‧‧ first feed source

14, 54, S2‧‧‧ second feed source

15, 55, 75‧‧‧ first switching circuit

151‧‧‧Switch unit

153‧‧‧Switching components

551, 751‧‧‧ first switching unit

553, 753‧‧‧ first switching element

57, 29, 76‧‧‧ second switching circuit

571, 761‧‧‧Second switching unit

573, 763‧‧‧ second switching element

155, 58, 77‧‧‧ resonant circuit

L, L1-Ln‧‧‧Inductors

C, C1-Cn‧‧‧ capacitor

59, 81‧‧‧ Matching circuit

26, 61, 73‧‧‧ first radiator

610, 731‧‧‧ First Radiation Department

611, 733, 831 ‧ ‧ Second Radiation Department

612‧‧‧ Third Radiation Department

613‧‧‧First Radiation Arm

614‧‧‧second radiation arm

615, 734‧‧‧First radiant section

616, 735‧‧‧second radiant section

617, 736‧‧‧ third radiant section

618‧‧‧First connection segment

619‧‧‧Second connection

27, 62‧‧‧ third feed source

28, 63‧‧ ‧Isolation Department

30, 64, 78‧‧‧ second radiator

301‧‧‧First Radiation Department

302‧‧‧Second Radiation Department

303‧‧‧First radiant section

304‧‧‧second radiant section

305‧‧‧The third radiant section

306‧‧‧First connection segment

307‧‧‧Second connection

308‧‧‧ third connection

832‧‧‧First coupling section

833‧‧‧Second coupling section

834‧‧‧ Third coupling section

31, 65‧‧‧ fourth feed source

32‧‧‧Metal frame

66, 79‧‧‧ third switching circuit

400, 600, 800‧‧‧ wireless communication devices

401, 601, 801‧‧‧ display unit

603, 803‧‧‧ Electronic components

402, 604, 804‧‧‧ camera lens

403, 605, 805 ‧ ‧ flash

404, 405, 606, 607, 806, 807‧‧‧ openings

1 is a schematic diagram of an antenna structure applied to a wireless communication device according to a first preferred embodiment of the present invention. 2 is a schematic view showing the assembly of the wireless communication device shown in FIG. 1. 3 is a schematic view showing the assembly of the wireless communication device shown in FIG. 2 from another angle. 4 is a circuit diagram of a first switching circuit in the antenna structure shown in FIG. 1. FIG. 5 is a circuit diagram of the first switching circuit shown in FIG. 4 provided with a resonant circuit. FIG. 6 is another circuit diagram of the first switching circuit shown in FIG. 4 provided with a resonant circuit. FIG. 7 is a schematic diagram showing the operation of generating a narrow frequency mode when the first switching circuit shown in FIG. 5 is provided with a resonant circuit. FIG. 8 is a schematic diagram showing the operation of generating a narrow frequency mode when the first switching circuit shown in FIG. 6 is provided with a resonant circuit. FIG. 9 is a current trend diagram of the antenna structure shown in FIG. 1 when operating in a low frequency mode and a GPS mode. FIG. 10 is a schematic diagram of current flow when the antenna structure shown in FIG. 1 operates in the 1710-2690 MHz frequency band. FIG. 11 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 1 when operating in a low frequency mode and a GPS mode. Figure 12 is a graph showing the radiation efficiency of the antenna structure of Figure 1 when operating in a low frequency mode. Figure 13 is a graph showing the radiation efficiency of the antenna structure of Figure 1 when operating in a GPS mode. Figure 14 is a graph of S-parameter (scattering parameters) of the antenna structure of Figure 1 operating in the 1710-2690 MHz band. Figure 15 is a graph showing the radiation efficiency of the antenna structure of Figure 1 operating in the 1710-2690 MHz band. FIG. 16 is a schematic structural view of an antenna structure according to a second preferred embodiment of the present invention. 17 to 19 are schematic diagrams showing the positional relationship of the isolation portions in the antenna structure shown in Fig. 16. FIG. 20 is a schematic diagram showing the current flow of the antenna structure shown in FIG. 16 when operating in a high frequency mode. FIG. 21 is a schematic diagram showing the current flow of the antenna structure shown in FIG. 16 when operating in a dual-frequency WIFI mode. FIG. 22 is a graph showing an S parameter (scattering parameter) of the antenna structure shown in FIG. 16 when operating in an intermediate frequency mode and a high frequency mode. FIG. 23 is a graph showing the radiation efficiency of the antenna structure shown in FIG. 16 when operating in an intermediate frequency mode and a high frequency mode. FIG. 24 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 16 when operating in WIFI 2.4 GHz mode and WIFI 5 GHz mode. Figure 25 is a graph showing the radiation efficiency of the antenna structure shown in Figure 16 when operating in the WIFI 2.4 GHz mode. Figure 26 is a graph showing the radiation efficiency of the antenna structure of Figure 16 when operating in a WIFI 5 GHz mode. FIG. 27 is a schematic diagram of an antenna structure applied to a wireless communication device according to a third preferred embodiment of the present invention. 28 is a schematic view showing the assembly of the wireless communication device shown in FIG. 27. 29 is a schematic view showing the assembly of the wireless communication device shown in FIG. 28 from another angle. Figure 30 is a circuit diagram of a first switching circuit in the antenna structure shown in Figure 27. Figure 31 is a circuit diagram of a second switching circuit in the antenna structure shown in Figure 27. Figure 32 is a current flow diagram of the antenna structure shown in Figure 27. Figure 33 is a circuit diagram showing the first switching circuit shown in Figure 30 with a resonant circuit. FIG. 34 is another circuit diagram of the first switching circuit shown in FIG. 30 in which a resonant circuit is provided. Fig. 35 is a view showing the operation of generating a narrow frequency mode when the first switching circuit shown in Fig. 33 is provided with a resonance circuit. Figure 36 is a diagram showing the operation of generating a narrow frequency mode when the first switching circuit shown in Figure 34 is provided with a resonant circuit. 37 is a current flow diagram of the antenna structure of FIG. 27 provided with a resonant circuit and operating in a low frequency mode. 38 is a schematic diagram showing the current flow when the antenna structure shown in FIG. 27 is provided with the resonant circuit and operates in the 1710-2690 MHz frequency band. Fig. 39 is a graph showing an S parameter (scattering parameter) of the antenna structure shown in Fig. 27 when operating in a low frequency mode. Figure 40 is a graph showing the radiation efficiency of the antenna structure shown in Figure 27 when operating in a low frequency mode. 41 is a graph of S-parameter (scattering parameter) of the antenna structure shown in FIG. 27 operating in the 1710-2690 MHz band. Figure 42 is a graph showing the radiation efficiency of the antenna structure shown in Figure 27 operating in the 1710-2690 MHz band. Figure 43 is a schematic structural view of an antenna structure according to a fourth preferred embodiment of the present invention. 44 is a schematic diagram showing the current flow when the antenna structure shown in FIG. 43 operates in the 1710-2400 MHz frequency band. 45 is a schematic diagram of current flow when the antenna structure shown in FIG. 43 operates in a dual-frequency WIFI mode. FIG. 46 is a schematic diagram showing the current flow when the antenna structure shown in FIG. 43 operates in the frequency band of 2496-2690 MHz. Figure 47 is a graph showing the S parameter (scattering parameter) of the antenna structure shown in Figure 43 when operating in the 1710-2400 MHz band. Figure 48 is a graph showing the radiation efficiency of the antenna structure shown in Figure 43 when operating in the 1710-2400 MHz band. 49 is a graph showing S-parameters (scattering parameters) of the antenna structure shown in FIG. 43 when operating in WIFI 2.4 GHz mode and WIFI 5 GHz mode. Figure 50 is a graph showing the radiation efficiency of the antenna structure shown in Figure 43 when operating in WIFI 2.4 GHz mode and WIFI 5 GHz mode. Figure 51 is a graph of S-parameters (scattering parameters) of the antenna structure of Figure 43 operating in the 2496-2690 MHz band. Figure 52 is a graph showing the radiation efficiency of the antenna structure shown in Figure 43 when operating in the 2496-2690 MHz band. Figure 53 is a schematic structural view of an antenna structure according to a fifth preferred embodiment of the present invention. Figure 54 is a schematic diagram showing the current flow of the antenna structure shown in Figure 53 when operating in the 1710-2170 MHz band. 55 is a schematic diagram showing the current flow of the antenna structure shown in FIG. 53 when operating in the 2300-2400 MHz and 2496-2690 MHz bands. Figure 56 is a graph showing the S parameter (scattering parameter) of the antenna structure shown in Figure 53 when operating in the 1710-2170 MHz band. 57 is a graph showing the radiation efficiency of the antenna structure shown in FIG. 53 operating in the 1710-2170 MHz band. Figure 58 is a graph of S-parameters (scattering parameters) for the antenna structure of Figure 53 operating in the 2300-2400 MHz and 2496-2690 MHz bands. Figure 59 is a graph showing the radiation efficiency of the antenna structure shown in Figure 53 when operating in the 2300-2400 MHz and 2496-2690 MHz bands. 60 is a schematic diagram of an antenna structure applied to a wireless communication device according to a sixth preferred embodiment of the present invention. Figure 61 is a schematic view showing the assembly of the wireless communication device shown in Figure 60. Figure 62 is a schematic view showing the assembly of the wireless communication device shown in Figure 61 at another angle. Figure 63 is a circuit diagram of a first switching circuit in the antenna structure shown in Figure 60. Figure 64 is a circuit diagram of a second switching circuit in the antenna structure shown in Figure 60. Figure 65 is a circuit diagram showing the first switching circuit shown in Figure 63 with a resonant circuit. Figure 66 is another circuit diagram of the first switching circuit shown in Figure 63 provided with a resonant circuit. Fig. 67 is a view showing the operation of generating a narrow frequency mode when the first switching circuit shown in Fig. 65 is provided with a resonance circuit. Figure 68 is a diagram showing the operation of generating a narrow-band mode when the first switching circuit shown in Figure 66 is provided with a resonant circuit. Figure 69 is a schematic diagram showing the current flow of the antenna structure shown in Figure 60 when operating in a low frequency mode. Figure 70 is a schematic diagram showing the current flow of the antenna structure shown in Figure 60 when operating in an intermediate frequency mode. 71 is a schematic diagram showing the current flow when the antenna structure shown in FIG. 60 operates in a high frequency mode. Fig. 72 is a graph showing an S parameter (scattering parameter) of the antenna structure shown in Fig. 60 when operating in a low frequency mode. Figure 73 is a graph showing the radiation efficiency of the antenna structure shown in Figure 60 when operating in a low frequency mode. Fig. 74 is a graph showing an S parameter (scattering parameter) when the antenna structure shown in Fig. 60 operates in an intermediate frequency mode. Figure 75 is a graph showing the radiation efficiency of the antenna structure shown in Figure 60 when operating in an intermediate frequency mode. Figure 76 is a graph showing the S parameter (scattering parameter) of the antenna structure shown in Figure 60 when operating in a high frequency mode. Figure 77 is a graph showing the radiation efficiency of the antenna structure shown in Figure 60 when operating in a high frequency mode. 78 is a schematic structural view of an antenna structure according to a seventh preferred embodiment of the present invention. 79 is a schematic diagram of current flow when the antenna structure shown in FIG. 78 operates in an intermediate frequency mode. Fig. 80 is a graph showing an S parameter (scattering parameter) of the antenna structure shown in Fig. 78 when operating in a low frequency mode. Figure 81 is a graph showing the radiation efficiency of the antenna structure shown in Figure 78 when operating in a low frequency mode. Fig. 82 is a graph showing an S parameter (scattering parameter) when the antenna structure shown in Fig. 78 operates in an intermediate frequency mode. Figure 83 is a graph showing the radiation efficiency of the antenna structure shown in Figure 78 when operating in an intermediate frequency mode.

no

Claims (17)

An antenna structure includes a housing, a first feeding source, and a first radiator. The housing includes a front frame, a back plate, and a frame. The frame is sandwiched between the front frame and the back plate. a slot is formed in the frame, a break point is formed on the front frame, and the break point is connected to the slot and extends to block the front frame, the slot and the break point are from the The housing defines a metal long arm and a metal short arm, and the first radiator is disposed in the housing, and includes a first radiating portion and a second radiating portion, and one end of the first radiating portion is electrically connected to the first portion a feed source, the other end is spaced apart from the metal long arm; one end of the second radiating portion is electrically connected to the first feed source, and the other end is electrically connected to the metal short arm. The antenna structure of claim 1, wherein the slot and the breakpoint are filled with an insulating material. The antenna structure of claim 1, wherein the frame comprises at least a tip end portion, a first side portion and a second side portion, the first side portion and the second side portion respectively connecting the end portion The first radiating portion includes a first radiating portion, a second radiating portion and a third radiating portion, the first radiating portion has one end electrically connected to the first feeding source and the other end being parallel Extending the end portion and extending in the direction of the first side portion until the break point is reached, one end of the second radiating portion is perpendicularly connected to the first radiating portion away from one end of the first feeding source, and One end extends in a direction parallel to the second side portion and adjacent to the metal long arm, and further forms an L-shaped structure with the first radiating portion, and the third radiating portion is spaced apart from the metal long arm and arranged in parallel. The third radiating section is vertically connected to the end of the second radiating section away from the first radiating section, and extends in a direction close to the first side and the second side, respectively, and further The two radiating segments form a T-shaped structure. The antenna structure of claim 3, wherein the front frame on one side of the breakpoint extends to a portion corresponding to one of the ends of the slot to form the metal long arm, When current enters from the first feed source, it will sequentially flow through the first radiant section, the second radiant section, and the third radiant section, and be coupled to the metal long arm via the third radiant section. Then flowing from the long arm of the metal through the first side portion and finally to the back plate to excite the first mode to generate a radiation signal of the first frequency band. The antenna structure of claim 4, wherein the antenna structure further includes a first switching circuit and a second switching circuit, the first switching circuit comprising a first switching unit and a plurality of first switching elements, The first switching unit is electrically connected to the metal long arm, and the plurality of first switching elements are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit, and the other end is electrically connected to the backboard. The second switching circuit includes a second switching unit and a plurality of second switching elements, the first feeding source is electrically connected to the first radiating section by a matching circuit, and the second switching unit is electrically connected to the In the matching circuit, the second switching elements are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit, and the other end is electrically connected to the backplane, by controlling the first switching unit and/or The switching of the second switching unit causes the first switching unit and the second switching unit to switch to different first switching elements and/or second switching elements to adjust the first frequency band. The antenna structure of claim 5, wherein the second radiating portion is a capacitor, one end of the second radiating portion is electrically connected to the first feeding source, and the other end is electrically connected to the Metal short arm. The antenna structure of claim 5, wherein the other side of the breakpoint has a front frame until it extends to a portion corresponding to the other end of the slot to form the metal short arm, The length of the metal long arm is greater than the length of the metal short arm. When a current enters from the first feed source, current flows directly into the metal short arm through the second radiating portion, and then flows through the first Two sides, finally flowing into the backplane, thereby exciting a second mode to generate a radiation signal of the second frequency band, the frequency of the second frequency band being higher than the frequency of the first frequency band, and when the current is from the After the first feed source enters, a current flows into the metal short arm through the second radiating portion, and is coupled to the metal long arm via the break point, and flows to the first switching circuit, and finally flows to the The backplane further excites a third mode to generate a third frequency band of radiation signals, the third frequency band having a higher frequency than the second frequency band. The antenna structure of claim 7, wherein the first switching circuit further comprises a resonant circuit, the number of the resonant circuits is one, one end of the resonant circuit is electrically connected to the metal long arm, and the other One end is electrically connected to the backboard. The antenna structure of claim 7, wherein the first switching circuit further comprises a resonant circuit, the number of the resonant circuits is consistent with the number of the first switching elements, and each of the resonant circuits is separately Connected between the first switching unit and the backplane, and in parallel with the corresponding first switching component, the resonant circuit is configured to enable the third frequency band when the first frequency band is adjusted stay the same. The antenna structure of claim 7, wherein the first switching circuit further comprises a resonant circuit, the number of the resonant circuits is consistent with the number of the first switching elements, and each of the resonant circuits is separately Connected between the first switching unit and the backplane, and in parallel with the corresponding first switching component, the resonant circuit is configured to adjust the third correspondingly when the first frequency band is adjusted Frequency band. The antenna structure of claim 1, wherein the antenna structure further comprises a second radiator and a second feed source, the second radiator being disposed adjacent to the metal long arm, the second radiation The body is a straight strip, one end of the second radiator is electrically connected to the front frame, the other end extends toward the second side, and the second feeding source is disposed on the front frame. And electrically connected to the first radiator, when a current enters from the second feed source, it will flow through the second radiator, thereby exciting a fourth mode to generate a radiation signal of the fourth frequency band. The antenna structure of claim 11, wherein the antenna structure further includes a third switching circuit, one end of the third switching circuit is electrically connected to the second radiator, and the third switching circuit is The other end is electrically connected to the backplane for adjusting the fourth frequency band. The antenna structure of claim 1, wherein the wireless communication device uses carrier aggregation technology and uses at least two of the first radiator, the metal long arm, and the metal short arm to receive simultaneously in a plurality of different frequency bands. Or send a wireless signal. The antenna structure of claim 1, wherein the backboard is a single metal piece integrally formed, the backboard is directly connected to the frame, and there is no gap between the backboard and the frame, the backboard There are no slots, broken wires or breakpoints for separating the insulation of the backplane. A wireless communication device comprising the antenna structure of any one of claims 1-14. The wireless communication device of claim 15, wherein the wireless communication device further comprises a display unit, the front frame, the back panel and the frame constitute a casing of the wireless communication device, and the front frame is provided with an opening The display unit has a display plane, the display plane is exposed to the opening, and the display plane is disposed in parallel with the backboard. The wireless communication device of claim 15, wherein the wireless communication device further comprises a USB module, wherein the frame further has a port, the port corresponding to the USB module, The USB module is exposed from the port portion.