TWI626785B - Antenna structure and wireless communication device with same - Google Patents

Antenna structure and wireless communication device with same Download PDF

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Publication number
TWI626785B
TWI626785B TW105125082A TW105125082A TWI626785B TW I626785 B TWI626785 B TW I626785B TW 105125082 A TW105125082 A TW 105125082A TW 105125082 A TW105125082 A TW 105125082A TW I626785 B TWI626785 B TW I626785B
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TW
Taiwan
Prior art keywords
metal
antenna
frame
radiating
frequency band
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TW105125082A
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Chinese (zh)
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TW201804666A (en
Inventor
李承翰
許溢文
葉維軒
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群邁通訊股份有限公司
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Priority to US62/364,303 priority
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Publication of TW201804666A publication Critical patent/TW201804666A/en
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Publication of TWI626785B publication Critical patent/TWI626785B/en

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Abstract

The present invention provides an antenna structure including a metal member and a first feed source, the metal member including a metal front frame, a metal back plate, and a metal frame, the metal frame being sandwiched between the metal front frame and the metal back Between the boards, the metal frame includes at least a top portion, a first side portion, and a second side portion. The first side portion and the second side portion are respectively connected to two ends of the top portion, and the metal frame is opened. Slotted, the metal front frame is provided with a break point, the slot is disposed at least on the top, and the break point communicates with the slot and extends to block the metal front frame, the first A feed source is electrically connected to the metal front frame.

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 metal back plate is usually provided with a slot and a break point, which will affect the integrity and aesthetics of the metal back plate.

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 metal member and a first feeding source, the metal member includes a metal front frame, a metal back plate, and a metal frame, and the metal frame is sandwiched between the metal front frame and the metal back plate The metal frame includes at least a top portion, a first side portion, and a second side portion. The first side portion and the second side portion are respectively connected to two ends of the top portion, and the metal frame is provided with a slot. a break point is formed on the metal front frame, the slot is disposed at least on the top, and the break point is connected to the slot and extends to block the metal front frame, the first feed A source is electrically connected to the metal front frame.

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

The above antenna structure and the wireless communication device having the antenna structure can cover low frequency, intermediate frequency, high frequency, GPS, WIFI 2.4/5 GHz dual frequency, and the frequency range is wide. In addition, the slot and the break point on the metal member of the antenna structure are disposed on the metal front frame and the metal frame, and are not disposed on the metal back plate, so that the metal back plate constitutes an all-metal structure. That is, the metal back plate has no insulating slots, broken wires or break points, so that the metal back plate can avoid the integrity and aesthetics of the metal back plate due to the setting of the slot, the broken line or the break point. .

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.

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.

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 to the switching unit 151 and the metal backing plate 112. 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 to a corresponding switching element 153 and a metal backing plate 112, respectively.

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. The first radiator 26 is connected at one end to the partition 28 and the other end to 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.

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‧‧‧ antenna structure

11‧‧‧Metal parts

111‧‧‧Metal front frame

112‧‧‧Metal backplane

113‧‧‧Metal border

114‧‧‧ accommodating space

115‧‧‧ top

116‧‧‧First side

117‧‧‧ second side

118‧‧‧ slotting

119‧‧‧ breakpoints

A1‧‧‧Metal long arm

A2‧‧‧Metal short arm

E1, E2‧‧‧ endpoint

13‧‧‧First feed source

14‧‧‧second feed source

15‧‧‧First switching circuit

151‧‧‧Switch unit

153‧‧‧Switching components

155‧‧‧Resonance circuit

L‧‧‧Inductance

C‧‧‧ capacitor

26‧‧‧First radiator

27‧‧‧ Third feed source

28‧‧‧Isolation Department

29‧‧‧Second switching circuit

30‧‧‧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

31‧‧‧ fourth feed source

32‧‧‧Metal frame

400‧‧‧Wireless communication device

401‧‧‧ display unit

402‧‧‧ camera lens

403‧‧‧flash

404, 405‧‧‧ openings

no

Claims (19)

  1. An antenna structure includes a metal member and a first feeding source, the metal member includes a metal front frame, a metal back plate, and a metal frame, and the metal frame is sandwiched between the metal front frame and the metal back plate The metal frame includes at least a top portion, a first side portion, and a second side portion. The first side portion and the second side portion are respectively connected to two ends of the top portion, and the metal frame is provided with a slot. a break point is formed on the metal front frame, the slot is disposed at least on the top, and the break point is connected to the slot and extends to block the metal front frame, the first feed A source is electrically connected to the metal front frame.
  2. The antenna structure of claim 1, wherein the slot and the breakpoint are filled with an insulating material.
  3. The antenna structure of claim 1, wherein the metal front frame on one side of the breakpoint extends to a portion corresponding to one of the ends of the slot to form a metal long arm. The first feed source is electrically connected to the metal long arm, and when current enters the metal long arm from the first feed source, it will flow through the metal long arm and flow to the breakpoint. The first mode is then excited to generate a radiation signal of the first frequency band.
  4. The antenna structure of claim 3, wherein the antenna structure further comprises a first switching circuit, the first switching circuit comprising a switching unit and at least one switching element, the switching unit being electrically connected to the metal a long arm, the switching elements are connected in parallel with each other, and one end thereof is electrically connected to the switching unit, and the other end is connected to the metal back board, and by switching the switching unit, the switching unit is switched to Different switching elements further adjust the first frequency band.
  5. The antenna structure of claim 4, wherein the first switching circuit further comprises a resonant circuit, wherein the resonant circuit is configured to cause the metal long arm to additionally excite a second mode to generate a second frequency band. The radiation signal, the frequency of the second frequency band is higher than the frequency of the first frequency band.
  6. The antenna structure of claim 5, wherein the number of the resonant circuits is one, and the resonant circuit is electrically connected to the switching unit and the metal backplane.
  7. The antenna structure of claim 5, wherein the number of the resonant circuits is the same as the number of the switching elements, and each of the resonant circuits is electrically connected to a corresponding switching element and the metal backplane, respectively. The resonant circuit maintains the second frequency band unchanged when the first frequency band is adjusted.
  8. The antenna structure of claim 5, wherein the number of the resonant circuits is the same as the number of the switching elements, and each of the resonant circuits is electrically connected to a corresponding switching element and the metal backplane, respectively. The resonant circuit adjusts the second frequency band correspondingly when the first frequency band is adjusted.
  9. The antenna structure of claim 3, wherein the metal front frame on the other side of the break point extends to a portion corresponding to the other end of the slot to form a metal short arm. The length of the metal long arm is greater than the length of the metal short arm, the antenna structure further includes a second feed source, the second feed source is electrically connected to the metal short arm, when current is from the second After the feed source enters the metal short arm through the matching circuit, it will sequentially flow through the metal front frame and the second side portion and flow to the metal back plate, thereby exciting the third mode to generate The radiation signal of the third frequency band, the frequency of the third frequency band is higher than the frequency of the first frequency band.
  10. The antenna structure of claim 9, wherein the antenna structure further comprises a first radiator and a third feed source, the first radiator being a straight strip, the first radiator One end is connected to the metal front frame, the other end is extended toward the second side, one end of the third feed source is electrically connected to the metal front frame, and the other end is electrically connected to the first radiator. After the current enters the first radiator from the third feed source, the fourth mode is excited to generate a radiation signal of the fourth frequency band.
  11. The antenna structure of claim 10, wherein the antenna structure further includes a second switching circuit, one end of the second switching circuit is electrically connected to the first radiator, and the second switching circuit is The other end is connected to the metal backplane for adjusting the fourth frequency band.
  12. The antenna structure of claim 10, wherein the wireless communication device uses carrier aggregation technology and uses the first radiator to simultaneously receive or transmit wireless signals in a plurality of different frequency bands.
  13. The antenna structure of claim 10, wherein the wireless communication device uses carrier aggregation technology and uses the metal long arm, the metal short arm and the first radiator at least two of which are simultaneously different The band receives or transmits wireless signals.
  14. The antenna structure of claim 1, wherein the antenna structure further includes a second radiator and a fourth feed source, the second radiator is disposed adjacent to the metal long arm, and the fourth feed The source is disposed on the metal front frame and electrically connected to the second radiator, and when current enters from the fourth feed source, it will flow through the second radiator, thereby exciting the fifth The modality generates a radiation signal of the fifth frequency band and excites a sixth mode to generate a radiation signal of the sixth frequency band, wherein the frequency of the fifth frequency band is lower than the frequency of the sixth frequency band.
  15. The antenna structure of claim 14, wherein the second radiator comprises a first radiating portion, and the first radiating portion comprises a first radiating section, a second radiating section and a third radiating electrically connected in sequence a segment, the first radiant segment is disposed in parallel with the top portion, and one end of the second radiant segment is perpendicularly connected to an end of the first radiant segment adjacent to the second side portion, and the other end is parallel to the second portion a side portion extending in a direction close to the top portion, the third radiating portion is connected at one end to the second radiating portion away from one end of the first radiating portion, and the other end is parallel to the first radiating portion and close to the Extending in a direction of the first side portion, when the current enters from the fourth feed source, sequentially flows through the first radiant section, the second radiant section, and the third radiant section, thereby exciting the first Five modes.
  16. The antenna structure of claim 15, wherein the second radiator further includes a second radiating portion, the second radiating portion includes a first connecting portion, a second connecting portion, and a third connecting portion, One end of the first connecting section is electrically connected to an end of the first radiating section away from the second radiating section, and the other end extends in a direction parallel to the second radiating section and adjacent to the third radiating section, One end of the second connecting section is perpendicularly connected to one end of the first connecting section away from the first radiating section, and the other end extends in a direction parallel to the first radiating section and adjacent to the second radiating section, the third connecting section Connecting to the connection points of the first connecting segment and the second connecting segment, and extending in a direction parallel to the first radiating segment and adjacent to the first side portion to be in line with the second connecting segment, Until the metal front frame is connected, when the current enters from the fourth feed source, it will sequentially flow through the first connecting segment and the second connecting segment, thereby exciting the sixth mode.
  17. The antenna structure of claim 1, wherein the metal back plate is an integrally formed single metal piece, and the metal back plate is provided with an opening to expose the camera lens and the flash lamp.
  18. A wireless communication device comprising the antenna structure of any one of claims 1-17.
  19. The wireless communication device of claim 18, wherein the wireless communication device further comprises a display unit, the metal front frame, the metal back plate and the metal frame constitute an outer casing of the wireless communication device, the metal front The frame is provided with an opening for accommodating the display unit, 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 metal back plate.
TW105125082A 2016-07-19 2016-08-06 Antenna structure and wireless communication device with same TWI626785B (en)

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CN107634314A (en) 2018-01-26
TWM559003U (en) 2018-04-21
TW201806232A (en) 2018-02-16
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TWI651887B (en) 2019-02-21
TWI650902B (en) 2019-02-11

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