TWI640127B - Antenna structure and wireless communication device with same - Google Patents

Abstract

An antenna structure includes a housing, a first feed source, and a switching circuit, the housing includes a front frame, a back plate, and a frame, and the frame is sandwiched between the front frame and the back plate, a slot is formed in the frame, the front frame is provided with a slot, and the slot is disposed between the two ends of the slot, and communicates with the slot and extends to block the front frame, a first branch on one side of the slit, a first branch on the other side of the slit, and a second branch is formed in a portion of the front frame of the slit until a corresponding one of the ends of the slit forms, the first feed source is electrically connected to The first branch and the second branch, and the first branch is grounded by the switching circuit.

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 feed source, and a switching circuit, the housing includes a front frame, a back plate, and a frame, and the frame is sandwiched between the front frame and the back plate, a slot is formed in the frame, the front frame is provided with a slot, and the slot is disposed between the two ends of the slot, and communicates with the slot and extends to block the front frame, a first branch on one side of the slit, a first branch on the other side of the slit, and a second branch is formed in a portion of the front frame of the slit until a corresponding one of the ends of the slit forms, the first feed source is electrically connected to The first branch and the second branch, and the first branch is grounded by the switching circuit.

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 the low frequency, the intermediate frequency, the high frequency, the GPS frequency band and the WIFI 2.4G frequency band, and the frequency range is wide. In addition, the slot, the break point, and the slot 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 backplane constitutes an all-metal structure, that is, The slotted, broken or broken points are not insulated on the backplane, so that the backplane can avoid the integrity and aesthetics of the backplane 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

Referring to FIG. 1, a 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 together, the antenna structure 100 includes a housing 11 , a first feed source 13 , a second feed source 15 , a first matching circuit 16 , a second matching circuit 17 , a connecting portion 18 , and Switching circuit 19. The housing 11 can be an outer casing of the wireless communication device 400. In the present embodiment, the housing 11 is made of a metal material. The housing 11 includes a front frame 111, a back plate 112, and a frame 113. The front frame 111, the back plate 112 and the frame 113 may be integrally formed. The front frame 111, the back plate 112 and the frame 113 constitute an outer casing of the wireless communication device 400. An opening (not labeled) is disposed on the 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, the display plane is exposed to the opening, and the display plane is disposed substantially parallel to the backboard 112.

Referring to FIG. 4 together, the back plate 112 is disposed opposite to the front frame 111. The back plate 112 is directly connected to the frame 113, and there is no gap between the back plate 112 and the frame 113. The back plate 112 is an integrally formed single metal piece for exposing components such as the camera lens 402 and the flash 403. The back plate 112 is provided with openings 404 and 405. The backing plate 112 is not provided with any slot, break or break point for separating the insulation of the backing plate 112. The backing plate 112 can serve as the ground for the antenna structure 100.

The frame 113 is disposed between the front frame 111 and the back plate 112, and is disposed around the periphery of the front frame 111 and the back plate 112 to be opposite to the display unit 401 and the front The frame 111 and the back plate 112 together form an accommodation 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 frame 113 includes at least a tip portion 115, a first side portion 116, and a second side portion 117. In the embodiment, the end portion 115 is the top end of the wireless communication device 400. The end portion 115 connects the front frame 111 and the 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 end portion 115, preferably vertically. The first side portion 116 and the second side portion 117 are also connected to the front frame 111 and the back plate 112.

The frame 113 is further provided with a slot 118, and the front frame 111 is provided with a break point 119 and a slot 120. In the embodiment, the slots 118 are disposed on the end 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 be disposed only in the end portion 115 without extending to any one of the first side portion 116 and the second side portion 117, or A slot 118 is provided in the end portion 115 and extends only to 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 front frame 111. In the present embodiment, the break point 119 is disposed adjacent to the first side portion 116, such that the break point 119 divides the front frame 111 corresponding to the slot 118 into two parts, that is, the first radiating portion. A1 and second radiation portion A2. Wherein, the front frame 111 of the break point 119 side is extended to a portion corresponding to the first end E1 of the slot 118 to form the first radiating portion A1. The other side of the break point 119 is preceded by the frame 111 until it extends to a portion corresponding to the second end E2 of the slot 118 to form the second radiating portion A2. In this embodiment, the position where the break point 119 is opened does not correspond to the middle of the end portion 115, so the length of the first radiating portion A1 is smaller than the length of the second radiating portion A2.

The slit 120 is in communication with the slot 118 and extends to block the front frame 111. In the embodiment, the slit 120 is disposed adjacent to the second side portion 117, such that the slit 120 further divides the second radiating portion A2 into two parts, that is, the first branch B1 and the second branch B2. Wherein, the front frame 111 between the break point 119 and the slit 120 forms the first branch B1. The slit 120 is away from the front frame 111 of the break point 119 until it extends to a portion corresponding to the second end E2 of the slot 118 to form the second branch B2. In this embodiment, the position where the slit 120 is opened does not correspond to the middle of the second radiating portion A2, so the length of the first branch B1 is greater than the length of the second branch B2. In addition, the length of the first radiating portion A1 is smaller than the length of the second branch B2.

In this embodiment, the slot 118, the break point 119, and the slot 120 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto), and further The first branch B1 and the second branch B2 of the first radiating portion A1 and the second radiating portion A2 are separated from the rest of the casing 11.

It can be understood that, in this embodiment, the slot 118 is opened at one end of the frame 113 near the back plate 112 and extends to the front frame 111 to make the first radiating portion A1 and the second portion The first branch B1 and the second branch B2 of the radiation portion A2 are completely constituted by a part of the front frame 111. Of course, in other embodiments, the opening position of the slot 118 can also be adjusted according to specific needs. For example, the slot 118 is opened at one end of the frame 113 near the back plate 112 and extends toward the front frame 111 so that the first radiating portion A1 and the second radiating portion A2 are A branch B1 and a second branch B2 are composed of a part of the front frame 111 and a part of the frame 113.

It can be understood that the front frame 111 and the upper half of the frame 113 are not provided with other insulating slots, broken lines or break points except the slot 118, the break point 119 and the slot 120, so the front frame 111 In the upper half, there are only breakpoints 119 and slots 120, and there are no other breakpoints.

The first feed source 13 is disposed in the accommodating space 114 and disposed adjacent to the second end E2 of the slot 118. One end of the first feed source 13 is electrically connected to the first branch B1 and the second branch B2 by the first matching circuit 16 and the connecting portion 18, respectively, and is respectively the first branch B1 and the first branch The second branch B2 feeds current such that the first branch B1 excites a first mode to generate a radiation signal of a first frequency band, and the second branch B2 excites a second mode to generate a radiation signal of a second frequency band . In this embodiment, the first mode is a low frequency mode, and the first frequency band is an LTE-A 734-960 MHz frequency band. The second mode is an intermediate frequency mode, and the second frequency band is an LTE-A 1805-2170 frequency band.

In the embodiment, the connecting portion 18 includes a first connecting portion 181, a second connecting portion 183, a third connecting portion 185, and a fourth connecting portion 187. The first connecting section 181, the second connecting section 183, the third connecting section 185 and the fourth connecting section 187 are disposed in a coplanar manner. The first connecting section 181 has a substantially rectangular strip shape, one end of which is connected to the first feeding source 13 by the first matching circuit 16, and the other end is parallel to the end portion 115 and close to the first The direction of the side portion 116 extends. The second connecting portion 183 has a substantially rectangular strip shape, and one end thereof is perpendicularly connected to the first connecting portion 181 away from one end of the first feeding source 13 and the other end is parallel to the first side portion 116 and close to The end portion 115 extends in a direction until it is connected to a portion of the first branch B1 adjacent to the slit 120, thereby feeding current to the first branch B1.

The third connecting section 185 has a substantially rectangular strip shape, one end of which is connected to the connection of the first connecting section 181 and the first feeding source 13 , and the other end is parallel to the second connecting section 183 and away from The end portion 115 extends in the direction. The fourth connecting section 187 has a substantially rectangular strip shape, one end of which is perpendicularly connected to the third connecting section 185 away from one end of the first feeding source 13 and the other end is parallel to the first connecting section 181 and close to The second side portion 117 extends in a direction until it is connected to a portion of the second branch B2 adjacent to the second end E2, thereby feeding current to the second branch B2.

In this embodiment, the second feed source 15 is disposed in the accommodating space 114 and disposed adjacent to the first end E1 of the slot 118. One end of the second feed source 15 is electrically connected to the first radiating portion A1 by the second matching circuit 17, and the other end is electrically connected to the back plate 112, and further to the first radiating portion A1. The current is fed such that the first radiating portion A1 excites a third mode to generate a radiation signal of the third frequency band. In this embodiment, the third mode is a high frequency mode, and the third frequency band is an LTE-A 2300-2400 MHz, an LTE-A 2496-2690 MHz, and a WIFI 2.4 GHz band.

Referring to FIG. 5 together, one end of the switching circuit 19 is electrically connected to a position where the first branch B1 is close to the second connecting segment 183, and the other end is electrically connected to the backing plate 112, that is, grounded. The switching circuit 19 includes a switching unit 191 and at least one switching element 193. The switching unit 191 is electrically connected to the first branch B1. The switching element 193 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 193 are connected in parallel with each other, and one end thereof is electrically connected to the switching unit 191, and the other end is electrically connected to the backing plate 112, that is, grounded. Thus, by controlling the switching of the switching unit 191, the first branch B1 can be switched to a different switching element 193. Since each of the switching elements 193 has a different impedance, the frequency band of the first mode of the first branch B1 can be effectively adjusted by the switching of the switching unit 191.

It can be understood that, in this embodiment, the first branch B1 may additionally excite a fourth mode to generate a radiation signal of the fourth frequency band. For details, please refer to FIG. 6 and FIG. 7 , the switching circuit 19 may further include a resonant circuit 195 . Referring to FIG. 6, in one embodiment, the number of the resonant circuits 195 is one, and the resonant circuit 195 includes an inductor L and a capacitor C connected in series. The resonant circuit 195 is electrically connected between the first branch B1 and the back plate 112, and is disposed in parallel with the switching unit 191 and the at least one switching element 193.

Referring to FIG. 7, in another embodiment, the number of the resonant circuits 195 is the same as the number of the switching elements 193, that is, multiple. Each of the resonant circuits 195 includes inductors L1-Ln and capacitors C1-Cn connected in series with each other. Each of the resonant circuits 195 is electrically connected between the switching unit 191 and the backplane 112, and is disposed in parallel with the corresponding switching component 193.

It can be understood that the backplane 112 can serve as the antenna structure 100 and the wireless communication device 400. In another embodiment, a shielding mask for shielding electromagnetic interference or supporting a frame in the display unit 401 may be disposed on a side of the display unit 401 facing the backboard 112. The shield or the middle frame is made of a metal material. The shield or middle frame may be coupled to the back plate 112 to serve as the ground structure 100 and the wireless communication device 400. In FIGS. 5-7, the shield or middle frame can replace the backing plate 112 for grounding the switching circuit 19.

8 is a parallel circuit 195 of the switching circuit 19 shown in FIG. 6, and the S circuit (scattering parameter) of the second radiating portion A2 when the resonant circuit 195 includes an inductor L and a capacitor C connected in series with each other. Schematic diagram of the relationship between frequency and frequency. It is assumed that when the switching circuit 19 does not increase the resonant circuit 195 shown in FIG. 6, the first branch B1 of the antenna structure 100 operates in the first mode (refer to curve S81). When the switching circuit 19 increases the resonant circuit 195, the resonant circuit 195 may cause the first branch B1 to additionally resonate to a narrow frequency mode, that is, a fourth mode (refer to curve S82) to generate The radiation signal of the fourth frequency band can effectively increase the application frequency band of the antenna structure 100 to achieve multi-frequency or broadband application. In an embodiment, the fourth frequency band may be a GPS frequency band, and the fourth mode is also a GPS resonant mode.

9 is a resonant circuit 195 connected in parallel with each switching element 193 side of the switching circuit 19 shown in FIG. 7, and the resonant circuit 195 includes inductors L1-Ln and capacitors C1-Cn connected in series with each other. Schematic diagram of the relationship between the S parameter (scattering parameter) of the second radiating portion A2 and the frequency. It is assumed that when the switching circuit 19 does not increase the resonant circuit 195 shown in FIG. 7, the first branch B1 of the antenna structure 100 operates in the first mode (refer to curve S91). Thus, when the switching circuit 19 increases the resonant circuit 195, the resonant circuit 195 can cause the first branch B1 to additionally resonate out of the narrowband mode (see curve S92), that is, the GPS resonant mode. The application frequency band of the antenna structure 100 can be effectively increased to achieve multi-frequency or broadband applications. In addition, by setting the inductance value of the inductance L1-Ln in the resonant circuit 195 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. 9, the antenna structure 100 can be switched when the switching unit 191 is switched to a different switching element 193 by setting the inductance value and the capacitance value in the resonant circuit 195. The narrow-band mode (ie, the fourth mode) 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 195, so that the switching unit 191 switches to which one. The switching element 193 has a fixed frequency band of the narrow frequency mode.

It can be understood that in other embodiments, the resonant circuit 195 is not limited to include the inductor L and the capacitor C, and may also be composed of other resonant components. For example, please refer to FIG. 10 and FIG. 11 together. In another embodiment, the resonant circuit 195 includes only the capacitor C or the capacitors C1-Cn. So, please refer to Figure 12, which is a schematic diagram of the relationship between the standing wave ratio (SWR) and the frequency. When the capacitance value of the capacitor C or the capacitor C1-Cn is changed, the frequency doubling mode fh of the narrow frequency mode f1 can be effectively moved, and the application range is very wide.

FIG. 13 is a schematic diagram of current flow of the antenna structure 100. Obviously, when a current is fed from the first feed source 13, a portion of the current will flow into the first branch B1 of the second radiating portion A2 via the connecting portion 18, and flow to the break point 119 (the path) P1), thereby exciting the first mode to generate a radiation signal of the first frequency band. After the current is fed from the first feed source 13, another portion of the current will flow into the second branch B2 of the second radiating portion A2 via the connecting portion 18 and flow to the slit 120 (refer to the path P2). And exciting the second mode to generate a radiation signal of the second frequency band. When the current enters from the second feed source 15, it will flow through the first radiation portion A1 and flow to the break point 119 (refer to the path P3), thereby exciting the third mode to generate the first Three-band radiation signal.

It can be understood that, since the antenna structure 100 is provided with the switching circuit 19, the switching of the switching circuit 19 can be utilized to switch the first frequency band without affecting the operation of the medium and high frequencies. Furthermore, since the switching circuit 19 is provided with the resonant circuit 195. In this way, current can flow from the switching circuit 19 to the breakpoint 119 (refer to the path P4), so that the first branch B1 is coupled with the resonant circuit 195 to excite the fourth mode to generate a fourth Radiation signal in the frequency band.

14 is a graph of S-parameters (scattering parameters) of the antenna structure 100 when operating in a low frequency mode, a GPS mode, and an intermediate frequency mode. The curve S141 is the S11 value when the antenna structure 100 operates at LTE-A 734-756 MHz. Curve S142 is the S11 value when the antenna structure 100 operates at LTE-A 791-821 MHz. Curve S143 is the S11 value when the antenna structure 100 operates at LTE-A 869-894 MHz. Curve S144 is the S11 value when the antenna structure 100 operates at LTE-A 925-960 MHz. Curve S145 is the S11 value at which the antenna structure 100 operates at 1575 MHz. Curve S146 is the S11 value when the antenna structure 100 operates at LTE-A 1805-2170 MHz. Obviously, the curves S141-S144 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the switching circuit 19 can switch.

15 is a graph showing the total radiation efficiency of the antenna structure 100 when operating in a low frequency mode, a GPS mode, and an intermediate frequency mode. Wherein, the curve S151 is the total radiation efficiency when the antenna structure 100 operates at LTE-A 734-756 MHz. Curve S152 is the total radiation efficiency of the antenna structure 100 operating at LTE-A 791-821 MHz. Curve S153 is the total radiation efficiency of the antenna structure 100 operating at LTE-A 869-894 MHz. Curve S154 is the total radiation efficiency of the antenna structure 100 operating at LTE-A 925-960 MHz. Curve S155 is the total radiation efficiency of the antenna structure 100 operating at 1575 MHz. Curve S156 is the total radiation efficiency of the antenna structure 100 operating at LTE-A 1805-2170 MHz. Obviously, the curves S151-S154 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes that the switching circuit 19 can switch.

16 is a graph of S parameters (scattering parameters) when the antenna structure 100 operates in a high frequency mode (ie, LTE-A 2300-2400 MHz and LTE-A 2496-2690 MHz) and a WIFI 2.4G mode. 17 is a graph showing the radiation efficiency of the antenna structure 100 when operating in a high frequency mode (ie, LTE-A 2300-2400 MHz and LTE-A 2496-2690 MHz) and a WIFI 2.4G mode.

Obviously, as can be seen from FIG. 14 to FIG. 17, the antenna structure 100 can operate in a corresponding low frequency band, such as the LTE-A 734-960 MHz band. In addition, the antenna structure 100 can also work in the GPS frequency band, the middle frequency band (LTE-A 1805-2170 MHz frequency band), the high frequency band (ie, LTE-A 2300-2400 MHz, LTE-A 2496-2690 MHz), and the WIFI 2.4G frequency band. That is to cover the low, medium, high frequency, GPS frequency band, WIFI 2.4G frequency band, the frequency range is wide, and when the antenna structure 100 works in the above frequency band, the working frequency can meet the antenna working design requirements, and has Good radiation efficiency.

As described in the foregoing embodiments, the antenna structure 100 is configured to divide the first radiating portion A1 and the second radiating portion A2 from the front frame 111 by providing the slot 118, the break point 119, and the slot 120. The first branch B1 and the second branch B2. The antenna structure 100 is further provided with a first feed source 13 and a second feed source 15, so that currents of the first feed source 13 and the second feed source 15 can be respectively fed into the second radiation. The first branch B1 of the portion A2, the second branch B2, and the first radiating portion A1. As such, the first branch B1 of the second radiating portion A2 can excite the first mode to generate a radiated signal in the low frequency band. The second branch B2 of the second radiating portion A2 can excite the second mode to generate a radiation signal of the intermediate frequency band. The first radiating portion A1 can excite the third mode to generate a radiation signal of a 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.

In addition, the antenna structure 100 is provided with the housing 11, and the slot 118, the break point 119 and the slot 120 on the housing 11 are disposed on the front frame 111 and the frame 113, and are not disposed on the antenna frame 100. The backing plate 112 is configured to have an all-metal structure, that is, the backing plate 112 has no insulating slots, broken lines or break points, so that the backing plate 112 can avoid slotting, The setting of the broken line or breakpoint affects the integrity and aesthetics of the backing plate 112.

Example 2

Referring to FIG. 18, a second preferred embodiment of the present invention provides an antenna structure 200, which can be applied to a wireless communication device 300 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. 19 and FIG. 20 , the antenna structure 200 includes a housing 21 , a first feed source 22 , a matching circuit 23 , and a first ground portion 24 . The housing 21 can be an outer casing of the wireless communication device 300. In the present embodiment, the housing 21 is made of a metal material. The housing 21 includes a front frame 211, a back plate 212, and a frame 213. The front frame 211, the back plate 212 and the frame 213 may be integrally formed. The front frame 211, the back plate 212 and the frame 213 constitute an outer casing of the wireless communication device 300. An opening (not shown) is disposed on the front frame 211 for receiving the display unit 301 of the wireless communication device 300. It can be understood that the display unit 301 has a display plane, the display plane is exposed to the opening, and the display plane is disposed substantially parallel to the backboard 212.

Referring to FIG. 21 together, the backboard 212 is disposed opposite to the front frame 211. The back plate 212 is directly connected to the frame 213, and there is no gap between the back plate 212 and the frame 213. The back plate 212 is an integrally formed single metal piece for exposing components such as the camera lens 304 and the flash 305, and the back plate 112 is provided with openings 306, 307. The backing plate 112 is not provided with any slot, break or break point for separating the insulation of the backing plate 212. The backplane 212 corresponds to the antenna structure 200 and the ground of the wireless communication device 300.

The frame 213 is disposed between the front frame 211 and the back plate 212, and is disposed around the periphery of the front frame 211 and the back plate 212, respectively, to be opposite to the display unit 301 and the front The frame 211 and the back plate 212 together define an accommodating space 214. The accommodating space 214 is configured to receive electronic components or circuit modules of the circuit board, the processing unit, and the like of the wireless communication device 300.

The frame 213 includes at least a tip end portion 215, a first side portion 216, and a second side portion 217. In the embodiment, the end portion 215 is the bottom end of the wireless communication device 300. The end portion 215 connects the front frame 211 and the back plate 212. The first side portion 216 is disposed opposite to the second side portion 217, and is disposed at two ends of the end portion 215, preferably vertically. The first side portion 216 and the second side portion 217 are also connected to the front frame 211 and the back plate 212.

A first opening 218, a second opening 219 and a slot 220 are defined in the frame 213. A first break point 221 and a second break point 222 are defined in the front frame 211 . The first opening 218 and the second opening 219 are both formed on the end portion 215 , and both are spaced apart and penetrate the end portion 215 .

The wireless communication device 300 also includes at least one electronic component. In the embodiment, the wireless communication device 300 includes a first electronic component 302 and a second electronic component 303. The first electronic component 302 is a headphone interface module disposed in the accommodating space 214 and disposed adjacent to the first side portion 216 . The first electronic component 302 corresponds to the first opening 218 such that the first electronic component 302 is partially exposed from the first opening 218. Thus, the user can insert an earphone through the first opening 218 to establish an electrical connection with the first electronic component 302.

The second electronic component 303 is a USB module disposed in the accommodating space 214 and located between the first electronic component 302 and the second side 217 . The second electronic component 303 corresponds to the second opening 219 such that the second electronic component 303 is partially exposed from the second opening 219. Therefore, the user can insert a USB device through the second opening 219 to establish an electrical connection with the second electronic component 303.

In the embodiment, the slot 220 is disposed on the end portion 215 and communicates with the first opening 218 and the second opening 219, and extends to the first side portion 216 and the second portion, respectively. Side 217.

The first break point 221 and the second break point 222 are both in communication with the slot 220 and extend to block the front frame 211. In the embodiment, the first break point 221 is formed on the front frame 211 and communicates with the first end D1 of the first side portion 216 . The second break point 222 is disposed on the front frame 211 and communicates with the slot 220 disposed at the second end D2 of the second side portion 217 . As such, the slot 220, the first break point 221, and the second break point 222 collectively divide the housing 21 into a first portion F1 and a second portion F2 that are spaced apart from each other. The portion of the housing 21 that is enclosed by the slot 220, the first break point 221, and the second break point 222 constitutes the first portion F1, and the remaining portion of the housing 21 constitutes the The second part is F2. In this embodiment, the first portion F1 constitutes an antenna structure of the antenna structure 200 for receiving and/or transmitting radio waves to transmit and exchange wireless signals. The second portion F2 is grounded.

It can be understood that, in this embodiment, the slot 220 is disposed at one end of the frame 213 near the back plate 212 and extends to an edge of the front frame 211 such that the first portion F1 is completely partially The front frame 212 is constructed. Of course, in other embodiments, the opening position of the slot 220 can also be adjusted according to specific needs. For example, the slot 220 is disposed at one end of the frame 213 near the back plate 212 and extends toward the front frame 211 such that the first portion F1 is partially covered by the front frame 211 and the portion The frame 213 is constructed.

It can be understood that in other embodiments, the slot 220 may be disposed only on the end portion 215 without extending to any one of the first side portion 216 and the second side portion 217, or The slot 220 is disposed at the end portion 215 and extends only to one of the first side portion 216 and the second side portion 217. Thus, the positions of the first break point 221 and the second break point 222 can also be adjusted according to the position of the slot 220. For example, the first break point 221 and the second break point 222 may both be located at positions where the front frame 211 corresponds to the end portion 215. For example, one of the first break point 221 and the second break point 222 may be located at a position corresponding to the end portion 215 of the front frame 211, and the first break point 221 and the second break point 222 are The other one can be opened at a position where the front frame 211 corresponds to the first side portion 216 or the second side portion 217. Obviously, the shape and position of the slot 220 and the position of the first break point 221 and the second break point 222 on the frame 212 can be adjusted according to specific requirements, and only the slot 220 needs to be ensured. The first break point 221 and the second break point 222 may collectively divide the housing 21 into the first portion F1 and the second portion F2 that are spaced apart.

It can be understood that, in this embodiment, in addition to the positions of the first opening 218 and the second opening 219, the slot 220, the first breaking point 221 and the second breaking point 222 are filled with an insulating material. (for example, plastic, rubber, glass, wood, ceramics, etc., but not limited thereto), thereby separating the first portion F1 and the second portion F2.

It can be understood that, in this embodiment, the first feed source 22 is disposed in the accommodating space 214 and located between the second electronic component 303 and the second side 217, and adjacent to the The second electronic component 303 is disposed. The first feed source 22 is electrically connected to the first portion F1 by the matching circuit 23 to feed current to the first portion F1, and divide the first portion F1 into two parts, that is, the first branch H1 and the second branch H2. The first feeding source 22 side front frame 211 extends until the portion of the front frame 211 where the first breaking point 221 is disposed to form the first branch H1. The portion of the first feed source 22 on the other side of the front frame 211 until it extends to the front frame 211 where the second break point 222 is disposed forms the second branch H2. In this embodiment, the position where the first feed source 22 is opened does not correspond to the middle of the first portion F1, so the length of the first branch H1 is greater than the length of the second branch H2.

The first ground portion 24 is substantially in the shape of a strip, and is disposed in the accommodating space 214 and located between the first feed source 22 and the second side portion 217 . One end of the first grounding portion 24 is electrically connected to the second branch H2, and the other end is electrically connected to the backing plate 212, that is, grounded, thereby providing grounding for the second branch H2.

It can be understood that, in this embodiment, when a current enters from the first feed source 22, current will flow into the first branch H1 of the first portion F1 and flow to the first break point 221, thereby making The first branch H1 excites a first mode to generate a radiation signal of the first frequency band. In this embodiment, the first mode is a low frequency mode. The first frequency band is an LTE-A 704-960 MHz frequency band. In addition, when a current enters from the first feed source 22, current will also flow into the second branch H2 and flow to the second break point 222, and the ground is grounded by the first ground portion 24, thereby further The second branch H2 is caused to excite a second mode to generate a radiation signal of the second frequency band. In this embodiment, the second mode is an intermediate frequency mode. The frequency of the second frequency band is higher than the frequency of the first frequency band. The second frequency band is the 1710-1990 MHz frequency band.

It can be understood that, in other embodiments, to adjust the bandwidth of the first frequency band, that is, the antenna structure 200 has a preferred low frequency bandwidth, the antenna structure 200 further includes a first switching circuit 25. The first switching circuit 25 is disposed in the accommodating space 214 and located between the first electronic component 302 and the second electronic component 303. One end of the first switching circuit 25 is electrically connected to the first branch H1, and the other end is electrically connected to the backboard 212, that is, grounded.

Referring to FIG. 22 together, the first switching circuit 25 includes a switching unit 251 and at least one switching element 253. The switching unit 251 is electrically connected to the first branch H1. The switching element 253 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 253 are connected in parallel with each other, and one end thereof is electrically connected to the switching unit 251, and the other end is electrically connected to the backing plate 212, that is, grounded. Thus, by controlling the switching of the switching unit 251, the first branch H1 can be switched to a different switching element 253. Since each switching element 253 has a different impedance, the first frequency band generated by the first mode of the first branch H1 can be adjusted by switching of the switching unit 251.

It can be understood that, in this embodiment, the first branch H1 may additionally excite a third mode to generate a radiation signal of the third frequency band. For details, please refer to FIG. 23 and FIG. 24 , the first switching circuit 25 further includes a resonant circuit 255 . Referring to FIG. 23, in one embodiment, the number of the resonant circuits 255 is one, and the resonant circuit 255 includes an inductor L and a capacitor C connected in series. The resonant circuit 255 is electrically connected between the first branch H1 and the backplane 212, and is disposed in parallel with the switching unit 251 and the at least one switching component 253.

Referring to FIG. 24, in another embodiment, the number of the resonant circuits 255 is the same as the number of the switching elements 253, that is, multiple. Each of the resonant circuits 255 includes inductors L1-Ln and capacitors C1-Cn connected in series with each other. Each of the resonant circuits 255 is electrically connected between the switching unit 251 and the backing plate 212, and is disposed in parallel with the corresponding switching element 253.

25 is a parallel circuit 255 on the side of the switching unit 251 of the first switching circuit 25 shown in FIG. 23, and the resonant circuit 255 includes an inductor L and a capacitor C connected in series, the first branch H1 Schematic diagram of the relationship between S-parameters (scattering parameters) and frequency. It is assumed that when the first switching circuit 25 does not increase the resonant circuit 255 shown in FIG. 23, the first branch H1 of the antenna structure 200 operates in the first mode (refer to curve S251). When the first switching circuit 25 increases the resonant circuit 255, the resonant circuit 255 may cause the first branch H1 to additionally resonate to a narrow frequency mode, that is, a third mode (refer to curve S252), In order to generate the radiation signal of the third frequency band, the application frequency band of the antenna structure 200 can be effectively increased to achieve multi-frequency or broadband application. In an embodiment, the third frequency band may be a medium frequency band, and the third mode is also an intermediate frequency resonant mode. The frequency of the third frequency band is higher than the frequency of the second frequency band. The third frequency band is a frequency band of 2110-2170 MHz.

26 is a parallel circuit 255 on the side of each switching element 253 in the first switching circuit 25 shown in FIG. 24, and the resonant circuit 255 includes inductors L1-Ln and capacitors C1-Cn connected in series with each other. A schematic diagram of the relationship between the S parameter (scattering parameter) of the first branch H1 and the frequency. It is assumed that when the first switching circuit 25 does not increase the resonant circuit 255 shown in FIG. 24, the first branch H1 of the antenna structure 200 operates in the first mode (refer to curve S261). Thus, when the first switching circuit 25 increases the resonant circuit 255, the resonant circuit 255 can cause the first branch H1 to additionally resonate out of the narrowband mode (refer to curve S262), that is, the intermediate frequency. The resonant mode can effectively increase the application frequency band of the antenna structure 200 to achieve multi-frequency or wide-band applications. In addition, by setting the inductance value of the inductance L1-Ln in the resonant circuit 255 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. 26, the antenna structure 200 can be switched when the switching unit 251 is switched to a different switching element 253 by setting the inductance value and the capacitance value in the resonant circuit 255. The narrow-band mode (ie, the third mode) 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 255, so that the switching unit 251 switches to which one. The switching element 253 has a fixed frequency band of the narrow frequency mode.

It can be understood that in other embodiments, the resonant circuit 255 is not limited to include the inductor L and the capacitor C, and may also be composed of other resonant components. For example, please refer to FIG. 27 and FIG. 28 together. In another embodiment, the resonant circuit 255 includes only the capacitor C or the capacitors C1-Cn. Thus, please refer to FIG. 29 , which is a schematic diagram of the relationship between the standing wave ratio (SWR) and the frequency. When the capacitance value of the capacitor C or the capacitance C1-Cn is changed, the frequency doubling mode fh of the narrow frequency mode f1 can be effectively moved, and the range of motion is very wide.

It can be understood that, referring to FIG. 18 again, in other embodiments, the antenna structure 200 further includes a radiator 26, a second feed source 27, a second ground portion 28, and a second switching circuit 29.

In the present embodiment, the radiator 26 is disposed in the accommodating space 214 and disposed adjacent to the first break point 221 and spaced apart from the back plate 212. In the present embodiment, the radiator 26 is substantially straight and spans above the first electronic component 302 and spaced apart from the first electronic component 302. One end of the radiator 26 is disposed adjacent to the first electronic component 302, and the other end extends in a direction parallel to the end portion 215 and adjacent to the second side portion 217, and spans the first electronic component 302, The continuation extends in a direction parallel to the distal end portion 215 and adjacent to the second side portion 217.

The second feed source 27 is disposed between the first side portion 216 and the first electronic component 302. One end of the second feed source 27 is electrically connected to one end of the radiator 26 near the second ground portion 28, and the other end is electrically connected to the back plate 212, that is, grounded, for the radiator 26 Feed current signal. One end of the second grounding portion 28 is electrically connected to the radiator 26, and the other end is electrically connected to the backing plate 212, that is, grounded, thereby providing grounding for the radiator 26. Thus, when current enters from the second feed source 27, it will flow through the radiator 26, thereby causing the radiator 26 to excite a fourth mode to generate a radiation signal of the fourth frequency band. In this embodiment, the fourth mode is a high frequency mode, and the frequency of the fourth frequency band is higher than the frequency of the third frequency band.

The second feeding source 27 and the second grounding portion 28 are disposed on one side of the first electronic component 302 near the first side portion 216, and the second switching circuit 29 is disposed on the first electronic component 302 is adjacent to one side of the second side portion 217. One end of the second switching circuit 29 is electrically connected to a position inside the radiator 26, and the other end is electrically connected to the back plate 212, that is, grounded. The second switching circuit 29 is configured to adjust a frequency band of the high frequency mode of the radiator 26 such that the high frequency mode covers an application frequency band of LTE-A 2300-2400 MHz and LTE-A 2496-2690 MHz, that is, LTE-A 2300-2690 MHz Frequency band. The specific circuit structure and working principle of the second switching circuit 29 can be referred to the description of the first switching circuit 25 of FIG. 22, and details are not described herein again.

FIG. 30 is a schematic diagram of current flow of the antenna structure 200. Obviously, when current enters from the first feed source 22, current will flow through the first branch H1 and flow to the first break point 221 (refer to the path I1), thereby exciting the first mode. State to generate a radiation signal of the first frequency band. Meanwhile, when a current is fed from the first feed source 22, the current will also flow through the second branch H2 and flow to the second breakpoint 222 (refer to the path I2), and finally by The first grounding portion 24 is grounded to excite the second mode to generate a radiation signal of the second frequency band. In addition, since the antenna structure 200 is provided with the first switching circuit 25, the switching of the first switching circuit 25 can be utilized, thereby switching the first mode while not affecting the operation of the medium and high frequencies.

Furthermore, since the antenna structure 200 is provided with the resonant circuit 255. In this way, the current flowing in the first branch H1 can be caused to flow to the resonant circuit 255 in the first switching circuit 25, and finally to the first break point 221 (refer to the path I3), so that the first A branch H1 is coupled to the resonant circuit 255, such that the first branch H1 additionally excites the third mode to generate a radiation signal of the third frequency band. In addition, when a current is fed from the second feed source 27, it will flow through the radiator 26 (refer to the path I4), thereby exciting the fourth mode to generate a radiation signal of the fourth frequency band. Obviously, as can be seen from FIG. 22 and FIG. 30, the back plate 212 corresponds to the ground of the antenna structure 200.

It can be understood that the backplane 212 can serve as the ground structure 200 and the wireless communication device 300. In another embodiment, a shielding mask for shielding electromagnetic interference or supporting a frame in the display unit 301 may be disposed on a side of the display unit 301 facing the backboard 212. The shield or the middle frame is made of a metal material. The shield or middle frame may be coupled to the back plate 212 to serve as the ground structure 200 and the wireless communication device 300. Grounded at each of the above, the shield or middle frame can replace the backplane 212 for grounding the antenna structure 100 or the wireless communication device 300.

FIG. 31 is a graph of S parameters (scattering parameters) when the antenna structure 200 operates in the LTE-A low frequency mode, the intermediate frequency mode, and the high frequency mode. The curve S311 is the S11 value when the antenna structure 200 operates at 704-746 MHz. Curve S312 is the S11 value at which the antenna structure 200 operates at 746-787 MHz. Curve S313 is the S11 value at which the antenna structure 200 operates at 791-862 MHz. Curve S314 is the S11 value at which the antenna structure 200 operates at 824-894 MHz. Curve S315 is the S11 value at which the antenna structure 200 operates at 880-960 MHz. Curve S316 is the S11 value at which the antenna structure 200 operates at 1710-2170 MHz. Curve S317 is the S11 value when the antenna structure 200 operates at 2300-2400 MHz. Curve S318 is the S11 value at which the antenna structure 200 operates at 2500-2690 MHz. Obviously, the curves S311-S315 respectively correspond to five different frequency bands, and respectively correspond to five of the plurality of low frequency modes that the first switching circuit 25 can switch.

32 is a graph showing the total radiation efficiency of the antenna structure 200 when operating in the LTE-A low frequency mode, the intermediate frequency mode, and the high frequency mode. The curve S321 is the total radiation efficiency when the antenna structure 200 operates at 704-746 MHz. Curve S322 is the total radiation efficiency of the antenna structure 200 operating at 746-787 MHz. Curve S323 is the total radiation efficiency of the antenna structure 200 operating at 791-862 MHz. Curve S324 is the total radiation efficiency of the antenna structure 200 operating at 824-894 MHz. Curve S325 is the total radiation efficiency of the antenna structure 200 operating at 880-960 MHz. Curve S326 is the total radiation efficiency of the antenna structure 200 operating at 1710-2170 MHz. Curve S327 is the total radiation efficiency of the antenna structure 200 operating at 2300-2400 MHz. Curve S328 is the total radiation efficiency of the antenna structure 200 operating at 2500-2690 MHz. Obviously, the curves S321-S325 respectively correspond to five different frequency bands, and respectively correspond to five of the plurality of low frequency modes that the first switching circuit 25 can switch.

Obviously, as can be seen from FIG. 31 to FIG. 32, the antenna structure 200 can operate in a corresponding low frequency band, such as the 704-960 MHz band. In addition, the antenna structure 200 can also work in the middle frequency band (1710-2170MHz frequency band) and the high frequency band (ie, 2300-2400MHz, 2500-2690MHz frequency band), that is, cover to low, medium and high frequency, and the frequency range is wide, and When the antenna structure 200 operates in the above frequency band, its operating frequency can meet the antenna working design requirements and has better radiation efficiency.

As described in the foregoing embodiments, the antenna structure 200 divides the front frame 211 into a first portion F1 and a second portion by providing the slot 220, the first break point 221, and the second break point 222. F2. The antenna structure 200 is further provided with a first feed source 22 to further divide the first portion F1 into a first branch H1 and a second branch H2, so that the current of the first feed source 22 can be separately fed. The first branch H1 and the second branch H2 are entered. As such, the first branch H1 can excite the first mode to generate a radiation signal in the low frequency band, and the second branch H2 can excite the second mode to generate a radiation signal in the intermediate frequency band. In addition, the first branch H1 can be matched with the resonant circuit 255 to additionally excite the third mode to generate a radiation signal of the third frequency band. Furthermore, the antenna structure 200 is further provided with a radiator 26 and the second feed source 27, such that the radiator 26 excites a fourth mode to generate a radiation signal of the fourth frequency band. Therefore, the wireless communication device 300 can use the Carrier Aggregation (CA) technology of the LTE-Advanced and the at least two of the radiator 26, the first branch H1, and the second branch H2 at the same time. Different frequency bands receive or transmit wireless signals to increase the transmission bandwidth.

In addition, the antenna structure 200 is provided with the housing 21, and the first opening 218, the second opening 219, the slot 219, the first breaking point 221 and the second breaking point 222 on the housing 21. The backplanes 212 are not disposed on the backplane 212, so that the backplanes 212 form an all-metal structure, that is, the backplanes 212 are not insulated and slotted. The line or breakpoint allows the backing plate 212 to avoid affecting the integrity and aesthetics of the backing plate 212 due to the provision of slots, breaks, or breakpoints.

Example 3, 4

Please refer to FIG. 33, which is an antenna structure 200a according to a third preferred embodiment of the present invention. The antenna structure 200a includes a housing 21, a first feed source 31, a matching circuit 23, a matching circuit 32, a first switching circuit 25, a radiator 26, a second feed source 27, a second ground portion 28, and a second Switching circuit 29. The housing 21 includes a front frame 211, a back plate 212, and a frame 213. The frame 213 includes at least a tip end portion 215, a first side portion 216, and a second side portion 217. The frame 213 is further provided with a slot 220. A first break point 221 and a second break point 322 are defined in the front frame 211 .

It can be understood that the antenna structure 200a is different from the antenna structure 200 in that the first ground portion 24 is not disposed in the antenna structure 200a, and the antenna structure 200a includes only one ground portion, that is, the second ground portion 28.

It can be understood that, in this embodiment, the position of the second break point 322 in the antenna structure 200a is different from the position of the second break point 222 in the antenna structure 200. Specifically, the first break point 221 is formed on the front frame 211 and communicates with the first end D1 of the first side portion 216 . The second break point 322 is opened on the front frame 211. The second break point 322 is not disposed at a position corresponding to the second end D2 of the slot 220, but is disposed between the first end D1 and the second end D2, and Adjacent to the second side portion 217. In this manner, the slot 220 and the first break point 221 collectively divide the first portion F1 and the second portion F2 from the housing 21 . The front frame 211 on the side of the first break point 221 until it extends to a portion corresponding to the second end D2 of the slot 220 to form the first portion F1, the housing 21 remaining The portion constitutes the second portion F2. The second portion F2 is grounded.

In addition, the second break point 322 further divides the first portion F1 into two parts, that is, a first branch K1 and a second branch K2. The front frame 211 between the first break point 221 and the second break point 322 constitutes the first branch K1. The second break point 322 is on the side of the front frame 211 until it extends to a portion of the second branch K2 corresponding to the second end D2 of the slot 220. The length of the first branch K1 is greater than the length of the second branch K2.

It can be understood that, in this embodiment, the connection relationship between the first feed source 31 and other components is also different from the first feed source 22 in the antenna structure 200. Specifically, one end of the first feed source 31 is electrically connected to a position of the first branch K1 adjacent to the second break point 322 by a matching circuit 23, and the other end of the first feed source 31 is Another matching circuit 32 is electrically connected to a position of the second branch K2 adjacent to the second end D2 for respectively feeding current to the first branch K1 and the second branch K2.

Referring to FIG. 34 together, when current enters from the first feed source 31, current will flow into the first branch K1 of the first portion F1 and flow to the first break point 221 (refer to path J1). The first branch K1 is further excited to generate a first mode to generate a radiation signal of the first frequency band. In this embodiment, the first mode is a low frequency mode. The first frequency band is a frequency band of 704-960 MHz. In addition, when a current enters from the first feed source 31, current will also flow into the second branch K2 and flow to the second break point 322 (refer to path J2), thereby causing the second branch K2. A second mode is excited to generate a radiation signal of the second frequency band. In this embodiment, the second mode is an intermediate frequency mode. The frequency of the second frequency band is higher than the frequency of the first frequency band. The second frequency band is the 1710-1990 MHz frequency band. In addition, the current flowing in the first branch K1 flows to the resonant circuit 255 in the first switching circuit 25, and finally flows to the first break point 221 (refer to the path J3), so that the first branch The first circuit K1 additionally excites the third mode to generate a radiation signal of the third frequency band. The third frequency band is a frequency band of 2110-2170 MHz. When the current is fed from the second feed source 27, it will flow through the radiator 26 (refer to path J4), thereby exciting the fourth mode to generate a radiation signal of the fourth frequency band. The fourth frequency band is a frequency band of 2300-2690 MHz. The S-parameter (scattering parameter) and the total radiation efficiency of the antenna structure 200a operating at low, medium, and high frequencies of LTE-A are the same as those of the antenna structure 200, as shown in FIGS. 31 and 32.

Please refer to FIG. 35, which is an antenna structure 200b according to a fourth preferred embodiment of the present invention. The antenna structure 200b includes a housing 21, a first feed source 33, a matching circuit 23, a first switching circuit 25, a radiator 26, a second feed source 27, a second ground portion 28, and a second switching circuit 29. The housing 21 includes a front frame 211, a back plate 212, and a frame 213. The frame 213 includes at least a tip end portion 215, a first side portion 216, and a second side portion 217. The frame 213 is further provided with a slot 220. A first break point 221 and a second break point 322 are defined in the front frame 211 .

It can be understood that the antenna structure 200b is different from the antenna structure 200a in that the connection relationship between the first feed source 33 and other components is also different from that of the first feed source 31 in the antenna structure 200a. Specifically, one end of the first feed source 33 is electrically connected to a position of the first branch K1 adjacent to the second break point 322 by a matching circuit 23, and the other end of the first feed source 33 is electrically connected. To the backing plate 212, that is, grounded.

Referring to FIG. 36 together, when current enters from the first feed source 33, current will flow into the first branch K1 of the first portion F1 and flow to the first break point 221 (refer to the path Q1). The first branch K1 is further caused to excite the first mode to generate a radiation signal of the first frequency band. In addition, when a current enters the first branch K1 from the first feed source 33, current will also be coupled to the second branch K2 by the second break point 322 and flow to the back plate 212. (Refer to path Q2), which in turn causes the second branch K2 to excite the second mode to generate a radiation signal of the second frequency band. In addition, a current flowing in the first branch K1 flows to the resonant circuit 255 in the first switching circuit 25, and finally flows to the first break point 221 (refer to the path Q3), so that the first branch The first circuit K1 additionally excites the third mode to generate a radiation signal of the third frequency band. When the current is fed from the second feed source 27, it will flow through the radiator 26 (refer to path Q4), thereby exciting the fourth mode to generate a radiation signal of the fourth frequency band. The first to fourth modes corresponding to the paths Q1-Q4 and the first to fourth frequency bands are respectively the same as the paths J1-J4 in FIG. The S-parameter (scattering parameter) and the total radiation efficiency of the antenna structure 200b operating at low, medium and high frequencies of LTE-A are the same as those of the antenna structure 200, as shown in FIGS. 31 and 32.

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 200a of the third preferred embodiment of the present invention, and the antenna structure of the fourth preferred embodiment of the present invention 200b can be applied to the same wireless communication device. For example, the antenna structure 100 is disposed at the upper end of the wireless communication device as a secondary antenna, and the antenna structure 200, 200a or 200b 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, 200a, 200b‧‧‧ antenna structure

11, 21‧‧‧ shell

111, 211‧‧‧ front box

112, 212‧‧‧ Backplane

113, 213‧‧‧ border

114, 214‧‧‧ accommodating space

115, 215‧‧ ‧ end

116, 216‧‧‧ first side

117, 217‧‧‧ second side

218‧‧‧ first opening

219‧‧‧Second opening

118, 220‧‧‧ slotting

119‧‧‧ breakpoints

120‧‧‧ gap

221‧‧‧ first breakpoint

222, 322‧‧‧ second breakpoint

A1‧‧‧First Radiation Department

A2‧‧‧Second Radiation Department

F1‧‧‧Part 1

F2‧‧‧Part II

E1, D1‧‧‧ first end

E2, D2‧‧‧ second end

First branch of B1, H1, K1‧‧

B2, H2, K2‧‧‧ second branch

13, 22, 31, 33‧‧‧ first feed source

23, 32‧‧‧ Matching circuit

16‧‧‧First matching circuit

17‧‧‧Second matching circuit

18‧‧‧Connecting Department

181‧‧‧First connection segment

183‧‧‧Second connection

185‧‧‧ third connection

187‧‧‧fourth connection

24‧‧‧First grounding

19‧‧‧Switching circuit

25‧‧‧First switching circuit

191, 251‧‧‧Switch unit

193, 253‧‧‧ Switching components

195, 255‧‧‧ resonant circuit

L, L1-Ln‧‧‧Inductors

C, C1-Cn‧‧‧ capacitor

26‧‧‧ radiator

15, 27‧‧‧second feed source

28‧‧‧Second grounding

29‧‧‧Second switching circuit

300, 400‧‧‧ wireless communication devices

301, 401‧‧‧ display unit

302‧‧‧First electronic component

303‧‧‧Second electronic components

304, 402‧‧‧ camera lens

305, 403‧‧‧ flash

206, 207, 404, 402‧‧‧ 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 circuit diagram of the antenna structure shown in FIG. 1. 4 is a schematic view showing the assembly of the wireless communication device shown in FIG. 2 from another angle. FIG. 5 is a circuit diagram of a switching circuit in the antenna structure shown in FIG. 1. FIG. FIG. 6 is a circuit diagram of the switching circuit of FIG. 5 provided with a resonant circuit. FIG. 7 is another circuit diagram of the switching circuit of FIG. 5 provided with a resonant circuit. FIG. 8 is a schematic diagram showing the operation of generating a narrow frequency mode when the switching circuit shown in FIG. 6 is provided with a resonant circuit. FIG. 9 is a schematic diagram showing the operation of generating a narrow-band mode when the switching circuit shown in FIG. 7 is provided with a resonant circuit. Figure 10 is another circuit diagram of the resonant circuit shown in Figure 6. Figure 11 is another circuit diagram of the resonant circuit shown in Figure 7. FIG. 12 is a schematic diagram showing the operation of generating a narrow frequency mode when the switching circuit shown in FIGS. 10-11 is provided with a resonant circuit. FIG. 13 is a schematic diagram showing the current flow of the antenna structure shown in FIG. 1. 14 is a graph of S-parameters (scattering parameters) of the antenna structure of FIG. 1 operating in a low frequency mode, a GPS mode, and an intermediate frequency mode. 15 is a graph showing the total radiation efficiency of the antenna structure shown in FIG. 1 when operating in a low frequency mode, a GPS mode, and an intermediate frequency mode. FIG. 16 is a graph of S-parameters (scattering parameters) of the antenna structure shown in FIG. 1 when operating in a high frequency mode and a WIFI 2.4G mode. 17 is a graph showing the total radiation efficiency of the antenna structure shown in FIG. 1 when operating in a high frequency mode and a WIFI 2.4G mode. FIG. 18 is a schematic diagram of an antenna structure applied to a wireless communication device according to a second preferred embodiment of the present invention. 19 is a schematic view showing the assembly of the wireless communication device shown in FIG. 18. Figure 20 is a circuit diagram of the antenna structure shown in Figure 18. 21 is a schematic view showing the assembly of the wireless communication device shown in FIG. 19 at another angle. Figure 22 is a circuit diagram of the first switching circuit in the antenna structure shown in Figure 18. Figure 23 is a circuit diagram showing the first switching circuit shown in Figure 22 with a resonant circuit. FIG. 24 is another circuit diagram of the first switching circuit shown in FIG. 22 provided with a resonant circuit. Figure 25 is a diagram showing the operation of generating a narrow frequency mode when the first switching circuit shown in Figure 23 is provided with a resonant circuit. Fig. 26 is a view showing the operation of generating a narrow frequency mode when the first switching circuit shown in Fig. 24 is provided with a resonance circuit. Figure 27 is another circuit diagram of the resonant circuit shown in Figure 23. Figure 28 is another circuit diagram of the resonant circuit shown in Figure 24. Figure 29 is a diagram showing the operation of generating a narrow frequency mode when the first switching circuit shown in Figures 27-28 is provided with a resonant circuit. Figure 30 is a schematic diagram showing the current flow of the antenna structure shown in Figure 18. Fig. 31 is a graph showing the S parameter (scattering parameter) of the antenna structure shown in Fig. 18 operating at low, medium and high frequencies. Figure 32 is a graph showing the total radiation efficiency of the antenna structure of Figure 18 operating at low, medium and high frequencies. 33 is a schematic diagram of an antenna structure applied to a wireless communication device according to a third preferred embodiment of the present invention. Figure 34 is a schematic diagram showing the current flow of the antenna structure shown in Figure 33. 35 is a schematic diagram of an antenna structure applied to a wireless communication device according to a fourth preferred embodiment of the present invention. Figure 36 is a schematic diagram showing the current flow of the antenna structure shown in Figure 35.

no

Claims (16)

An antenna structure includes a housing, a first feed source, and a switching circuit, the housing includes a front frame, a back plate, and a frame, and the frame is sandwiched between the front frame and the back plate, a slot is formed in the frame, the front frame is provided with a slot, and the slot is disposed between the two ends of the slot, and communicates with the slot and extends to block the front frame, a first branch on one side of the slit, a first branch on the other side of the slit, and a second branch is formed in a portion of the front frame of the slit until a corresponding one of the ends of the slit forms, the first feed source is electrically connected to The first branch and the second branch, and the first branch is grounded by the switching circuit. The antenna structure of claim 1, wherein the front frame is further provided with a break point, and the break point is disposed between the other end of the slot and the slot, and The slot is connected to and extends to block the front frame, and the front frame forms a first branch between the break point and the slit, and the length of the first branch is greater than the length of the second branch. The antenna structure of claim 2, wherein when current enters the first branch from the first feed source, it flows through the first branch and flows to the breakpoint, thereby exciting The first mode is generated to generate a radiation signal of the first frequency band. The antenna structure of claim 3, wherein when a current enters the second branch from the first feed source, it flows through the second branch and flows to the slit, thereby exciting The second mode is to generate a radiation signal of the second frequency band, and the signal of the second frequency band is higher than the signal of the first frequency band. The antenna structure of claim 4, wherein the antenna structure further comprises a second feed source, the front side of the breakpoint side of the frame until it extends to a portion corresponding to the other end of the slot Forming together a first radiating portion, one end of the second feeding source is electrically connected to the first radiating portion, and the other end is electrically connected to the back plate, and when current flows from the second feeding source into the first portion a radiation portion, flowing through the first radiation portion, and flowing to the break point, thereby exciting a third mode to generate a radiation signal of a third frequency band, wherein the signal of the third frequency band is higher than the first The signal of the second frequency band. The antenna structure of claim 2, wherein the slot, the breakpoint, and the slot are filled with an insulating material. The antenna structure of claim 3, wherein the switching circuit comprises a switching unit and at least one switching element, the switching unit is electrically connected to the first branch, and the switching elements are connected in parallel with each other, and One end is electrically connected to the switching unit, and the other end is electrically connected to the backplane. By controlling switching of the switching unit, the switching unit is switched to different switching elements, thereby adjusting the first frequency band. The antenna structure of claim 7, wherein the switching circuit further comprises a resonant circuit, wherein the resonant circuit is configured to cause the first branch to additionally excite a fourth mode to generate a fourth band of radiation signals. The frequency of the fourth frequency band is higher than the frequency of the first frequency band. The antenna structure of claim 8, wherein the number of the resonant circuits is one, the resonant circuit is electrically connected between the first branch and the backplane, and the switching unit and At least one switching element is arranged in parallel. The antenna structure of claim 8, 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 the switching unit and the backplane, respectively. The parallel circuit is disposed in parallel with the corresponding switching element, and the resonant circuit maintains the fourth frequency band unchanged when the second frequency band is adjusted. The antenna structure of claim 8, 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 the switching unit and the backplane, respectively. And being disposed in parallel with the corresponding switching element, when the second frequency band is adjusted, the resonant circuit correspondingly adjusts the fourth frequency band. The antenna structure of claim 1, wherein the first feed source is further electrically connected to the first branch and the second branch by a connecting portion, the bezel comprising at least a distal end portion, a first side And the second side portion, the first side portion and the second side portion are respectively connected to the two ends of the end portion, and the connecting portion comprises a first connecting portion, a second connecting portion, a third connecting portion and a fourth connecting section, wherein the first connecting section is connected to the first feeding source at one end, and the other end extends in a direction parallel to the end portion and adjacent to the first side portion, and the second connecting section is perpendicular to one end Connecting to the first connecting segment away from one end of the first feeding source, the other end extending in a direction parallel to the first side portion and adjacent to the end portion until the gap is adjacent to the first branch a portion of the connection; the third connection segment is connected at one end to the junction of the first connection segment and the first feed source, and the other end is extended in a direction parallel to the second connection segment and away from the end portion One end of the fourth connecting segment is vertically connected to the third connection The segment is away from one end of the first feed source, and the other end extends in a direction parallel to the first connecting segment and adjacent to the second side portion until being connected to the second branch. The antenna structure of claim 1, wherein the wireless communication device uses carrier aggregation technology and uses the first branch and the second branch to simultaneously receive or transmit wireless signals in a plurality of different frequency bands. 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.