TWI724738B - Antenna structure and wireless communication device with same - Google Patents

Abstract

The present invention provides an antenna structure including a housing, a first feeding portion, and a second feeding portion. The housing includes a metallic side frame, a middle frame, and a metal backboard. The side frame defines a first gap and a second gap. The backboard defines a slot. The slot, the first gap, and the second gap cooperatively divide the side frame into a first radiating portion. The first feed portion and the second feed portion both electrically connected to the first radiating portion for feeding current to the first radiating portion. When the first feed portion feeds current, the current flows through the first radiating portion and towards the second gap for activating a GPS mode and a WIFI 2.4GHz mode. When the second feed portion feeds current, the current flows through the first radiating portion and towards the first gap for activating a WIFI 5GHz mode.

Description

Antenna structure and wireless communication device with the antenna structure

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

With the advancement of wireless communication technology, electronic devices such as mobile phones and personal digital assistants continue to develop toward the trend of diversified functions, thinner and lighter, and faster and more efficient data transmission. However, the space that can accommodate the antenna is getting smaller and smaller, and with the continuous development of wireless communication technology, the demand for the bandwidth of the antenna is increasing. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue facing antenna design.

In view of this, it is necessary to provide an antenna structure and a wireless communication device with the antenna structure.

An antenna structure includes a housing, a first feeding part and a second feeding part. The housing includes a metal frame, a metal middle frame and an all-metal back plate, the metal middle frame and the all-metal back plate are arranged in parallel, The metal frame is arranged around the edge of the all-metal back plate, the metal frame is provided with a first breaking point and a second breaking point, the all-metal back plate is provided with a slot, the slot, the The first breaking point and the second breaking point jointly divide a first radiation part from the metal frame, and the metal frame between the first breaking point and the second breaking point forms the first A spoke The first feeding portion and the second feeding portion are spaced apart from each other, and both are electrically connected to the first radiating portion to feed current to the first radiating portion. When the first feeding portion feeds After the current is input, the current flows through the first radiating part and flows to the second breakpoint, thereby exciting the GPS mode and the WIFI 2.4GHz mode. When the second feeding part feeds the current, the The current flows through the first radiating part and flows to the first breaking point, thereby exciting the WIFI 5GHz mode.

A wireless communication device includes the above-mentioned antenna structure.

The above-mentioned antenna structure and the wireless communication device with the antenna structure are provided with the housing, and the antenna structure is divided from the housing by the break points on the housing, so that a broadband design can be effectively realized.

100: Antenna structure

11: shell

110: System ground plane

111: Border

112: middle frame

113: Backplane

114: Clearance area

115: End

116: first side

117: second side

118: Slotting

119: The first breakpoint

120: second breakpoint

121: Third Breakpoint

130: circuit board

F1: The first radiation department

F2: The second radiating part

F3: Third Radiation Department

12: The first feed-in part

13: The second feed-in part

14: The third feed-in part

15: The first grounding part

16: The second ground part

18: Switching circuit

18a, 18c: single switch

a1, b1, c1, d1: moving contacts

a2, c2: static contact

18b, 18d: multiple switch

b2, d2: the first static contact

b3, d3: second static contact

181, 183: matching components

b4, d4: third static contact

b5, d5: fourth static contact

200: wireless communication device

201: display unit

21: The first electronic component

23: The second electronic component

25: The third electronic component

27: The fourth electronic component

FIG. 1 is a schematic diagram of the antenna structure of the first preferred embodiment of the present invention applied to a wireless communication device.

Fig. 2 is an internal schematic diagram of the wireless communication device shown in Fig. 1.

FIG. 3 is a schematic cross-sectional view taken along the line III-III of the wireless communication device shown in FIG. 2. FIG.

FIG. 4 is a schematic cross-sectional view taken along the line IV-IV in the wireless communication device shown in FIG. 2. FIG.

Fig. 5 is a schematic cross-sectional view taken along the line V-V in the wireless communication device shown in Fig. 2.

Fig. 6 is an internal schematic diagram of the antenna structure shown in Fig. 1.

FIG. 7 is a schematic diagram of the current flow of the antenna structure shown in FIG.

8A to 8D are circuit diagrams of the switching circuit in the antenna structure shown in FIG. 6.

Fig. 9 is a graph of S parameters (scattering parameters) of the antenna structure shown in Fig. 1 working in GPS mode and WIFI 2.4GHz mode.

Fig. 10 is a graph showing the total radiation efficiency of the antenna structure shown in Fig. 1 working in GPS mode and WIFI 2.4GHz mode.

FIG. 11 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 1 operating in a WIFI 5GHz mode.

Fig. 12 is a graph showing the total radiation efficiency of the antenna structure shown in Fig. 1 operating in the WIFI 5GHz mode.

Fig. 13 is a graph of S parameters (scattering parameters) of the antenna structure shown in Fig. 1 operating in LTE-A low, medium and high frequency modes.

Fig. 14 is a graph showing the total radiation efficiency of the antenna structure shown in Fig. 1 operating in LTE-A low, medium, and high frequency modes.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those with ordinary knowledge in the field without creative work shall fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being "electrically connected" to another element, it can be directly connected to the other element or a central element may also exist. 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 otherwise defined, all technical and scientific terms used in this article have the same meanings commonly understood by those with ordinary knowledge in the field. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

Please refer to Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, a preferred embodiment of the present invention provides an antenna structure 100, which can be applied to mobile phones, personal digital assistants and other wireless communication devices 200 for transmitting, Receive radio waves to transmit and exchange wireless signals. FIG. 1 is a schematic diagram of an antenna structure 100 applied to a wireless communication device 200. FIG. 2 is an internal schematic diagram of the wireless communication device 200. 3 is a schematic cross-sectional view taken along the line III-III of the wireless communication device 200 shown in FIG. 2. 4 is a schematic cross-sectional view taken along the line IV-IV in the wireless communication device 200 shown in FIG. 2. FIG. 5 is a schematic cross-sectional view taken along the V-V line in the wireless communication device 200 shown in FIG. 2.

Please refer to FIG. 6 together. The antenna structure 100 includes a housing 11, a first feeding portion 12, a second feeding portion 13, a third feeding portion 14, a first grounding portion 15, a second grounding portion 16, and a switching circuit 18. . The housing 11 at least includes a system ground surface 110, a frame 111, a middle frame 112 and a back plate 113. A circuit board 130 is provided in the space enclosed by the frame 111, the middle frame 112 and the back plate 113 (refer to FIGS. 4 and 5). The system ground plane 110 may be made of metal or other conductive materials to provide a ground for the antenna structure 100.

The frame 111 has a substantially ring-shaped structure, which is made of metal or other conductive materials. The frame 111 is arranged on the periphery of the system ground plane 110, that is, it is arranged around the system ground plane 110. In this embodiment, the edge on one side of the frame 111 is spaced apart from the system ground surface 110, and a corresponding clearance area 114 is formed therebetween (refer to FIGS. 3 and 4). It can be understood that, in this embodiment, the distance between the frame 111 and the system ground surface 110 can be adjusted according to requirements. For example, the distance between the frame 111 and the system ground surface 110 at different positions may be equidistant or unequal.

The middle frame 112 is roughly in the shape of a rectangular sheet, which is made of metal or other conductive materials. The shape and size of the middle frame 112 are slightly smaller than the system ground plane 110. The middle frame 112 is stacked on the system ground surface 110.

In this embodiment, an opening (not shown in the figure) is provided on one side of the frame 111 close to the middle frame 112 for accommodating the display unit 201 of the wireless communication device 200. The display unit 201 has a display plane, and the display plane is exposed at the opening.

The back plate 113 is made of metal or other conductive materials. The back plate 113 is disposed on the edge of the frame 111. In this embodiment, the backplane 113 is arranged on a side of the system ground plane 110 that faces away from the middle frame 112, and is arranged substantially parallel to the display plane of the display unit 201 and the middle frame 112. .

In this embodiment, the system ground surface 110, the frame 111, the middle frame 112, and the back plate 113 can form an integrally formed metal frame. The middle frame 112 is a metal sheet located between the display unit 201 and the system ground plane 110. The middle frame 112 is used to support the display unit 201, provide electromagnetic shielding, and improve the mechanical strength of the wireless communication device 200.

In this embodiment, the frame 111 at least includes an end portion 115, a first side portion 116, and a second side portion 117. The end portion 115 is the top of the wireless communication device 200, that is, the antenna structure 100 constitutes an upper antenna of the wireless communication device 200. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and the two sides are respectively disposed at both ends of the end portion 115, preferably vertically.

The housing 11 is also provided with a slot 118 and at least one break point. Wherein, the slot 118 is opened on the back plate 113. The slot 118 is substantially U-shaped, and is opened on a side of the back plate 113 close to the end portion 115, and faces the first side portion 116 and the first side portion 116, respectively. The two side portions 117 extend in the direction where they are located.

In this embodiment, the housing 11 is provided with three break points, namely, a first break point 119, a second break point 120, and a third break point 121. The first break point 119, the second break point 120 and the third break point 121 are all opened on the frame 111. Specifically, the first breaking point 119 is opened on the end portion 115 and is located close to the first side portion 116. The second breakpoint 120 and the first breakpoint 119 are spaced apart. The second break point 120 is set on the first side 116 and is set corresponding to the end of the slot 118 on the first side 116. The third breakpoint 121 and the first breakpoint 119 are spaced apart. The third breaking point 121 is disposed on the end portion 115 and is disposed close to the second side portion 117. The first break point 119, the second break point 120, and the third break point 121 all penetrate and partition the frame 111, and are connected to the slot 118. It can be understood that, in this embodiment, the frame 111 is also provided with an earphone hole (not shown in the figure). The earphone hole is opened on the end portion 115 and is located adjacent to the second break point 120.

The slot 118 and the at least one break point together divide at least three radiating parts from the housing 11. In this embodiment, the slot 118, the first break point 119, the second break point 120, and the third break point 121 jointly divide three radiating parts from the housing 11, namely the first The radiating part F1, the second radiating part F2, and the third radiating part F3. Wherein, in this embodiment, the frame 111 between the first break point 119 and the second break point 120 forms the first radiating portion F1. The frame 111 between the first break point 119 and the third break point 121 forms the second radiating portion F2. The frame 111 between the third break point 121 and the slot 118 located between the end points of the second side portion 117 forms the third radiating portion F3.

In this embodiment, the first radiating portion F1 and the second radiating portion F2 are spaced apart from and insulated from the middle frame 112. The third radiating part F3 is located corresponding to the slot 118 One end of the second side portion 117 is connected to the system ground surface 110 and the back plate 113, that is, grounded. That is, in this embodiment, the slot 118 is used to separate the frame radiator (that is, the first radiating portion F1, the second radiating portion F2, and the third radiating portion F3) and the back plate 113. Of course, the slot 118 can also separate the frame radiator and the system ground surface 110, and the frame 111, the back plate 113, and the system ground surface 110 other than the slot 118 110 is connected.

It can be understood that, in this embodiment, the widths of the first breakpoint 119, the second breakpoint 120, and the third breakpoint 121 are the same. The width of the slot 118 is less than or equal to twice the width of the first break point 119, the second break point 120, or the third break point 121. Wherein, the width of the slot 118 is 0.5-2 mm. The widths of the first break point 119, the second break point 120, and the third break point 121 are 1-2 mm.

It can be understood that in this embodiment, the slot 118, the first break point 119, the second break point 120, and the third break point 121 are all filled with insulating materials (such as plastic, rubber, glass, wood, ceramics, etc.). Etc., but not limited to this).

Please also refer to FIG. 6, the wireless communication device 200 further includes at least one electronic component. In this embodiment, the wireless communication device 200 includes at least four electronic components, namely, a first electronic component 21, a second electronic component 23, a third electronic component 25 and a fourth electronic component 27.

The first electronic component 21 is a front lens module. The first electronic component 21 is disposed on the edge of the circuit board 130 adjacent to the second radiating portion F2, and is insulated from the second radiating portion F2 by the slot 118. The second electronic component 23 is a proximity sensor, which is disposed on the circuit board 130 and is spaced apart from the first electronic component 21. The third electronic component 25 is a receiver (receiver), which is disposed in the The circuit board 130 is located between the first electronic component 21 and the second electronic component 23. In this embodiment, the second electronic component 23 and the third electronic component 25 are also spaced and insulated from the second radiating portion F2 by the slot 118. The fourth electronic component 27 is a voice interface. The fourth electronic component 27 is disposed on the circuit board 130, which is located on a side of the first electronic component 21 away from the second electronic component 23 and is disposed corresponding to the earphone hole 122. In this way, an external device, such as an earphone, can be inserted through the earphone hole to establish an electrical connection with the fourth electronic component 27.

It can be understood that, in this embodiment, the distances between the second electronic component 23 and the third electronic component 25 and the slot 118 are approximately 2-10 mm. In other embodiments, the positions of the first electronic component 21, the second electronic component 23, and the third electronic component 25 can be adjusted according to specific requirements, for example, the positions of the three are interchanged.

It can be understood that, in this embodiment, the display unit 201 has a high screen-to-body ratio. That is, the area of the display plane of the display unit 201 is greater than 70% of the front area of the wireless communication device, and even a front full screen can be achieved. Specifically in this embodiment, the full screen refers to the left, right, and bottom sides of the display unit 201 except for the necessary slots (such as slots 118) provided on the antenna structure 100. The ground is connected to the frame 111.

It can be understood that, in this embodiment, the first feeding portion 12 is disposed in the clearance area 114 between the system ground plane 110 and the frame 111. One end of the first feeding portion 12 can be electrically connected to the signal feeding point on the system ground plane 110 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is connected by a matching circuit ( (Not shown) is electrically connected to a side of the first radiating portion F1 close to the first breaking point 119 for feeding a current signal to the first radiating portion F1.

The second feeding portion 13 is disposed in the clearance area 114 between the system ground plane 110 and the frame 111. One end of the second feeding portion 13 can be electrically connected to the signal feeding point on the system ground surface 110 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is connected by a matching circuit ( (Not shown) is electrically connected to a side of the first radiating portion F1 close to the second break point 120 for feeding a current signal to the first radiating portion F1.

The third feeding portion 14 is disposed in the clearance area 114 between the system ground plane 110 and the frame 111. One end of the third feeding part 14 can be electrically connected to the signal feeding point on the system ground plane 110 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is connected by a matching circuit ( (Not shown) is electrically connected to a side of the second radiating portion F2 close to the third break point 121 for feeding a current signal to the second radiating portion F2.

In this embodiment, the first grounding portion 15 is disposed between the first feeding portion 12 and the second feeding portion 13 and is located adjacent to the second feeding portion 13. One end of the first ground portion 15 can be electrically connected to the ground point on the system ground plane 110 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is electrically connected to the first radiation The part F1 is used to provide a ground for the first radiating part F1.

The second ground portion 16 is disposed in the clearance area 114 between the system ground surface 110 and the frame 111 and is disposed adjacent to the end of the slot 118 close to the second side portion 117. One end of the second ground portion 16 can be electrically connected to the ground point on the system ground plane 110 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is electrically connected to the third radiation The part F3 is used to provide a ground for the third radiating part F3.

It can be understood that, in this embodiment, the first feeding portion 12, the second feeding portion 13 and the third feeding portion 14 can be made of iron, metal copper foil, and laser direct molding technology (Laser Direct). structuring, LDS) made of materials such as conductors in the process.

Please also refer to FIG. 7, which is a current path diagram of the antenna structure 100. When the first feeding portion 12 feeds current, the current flows through the first radiating portion F1 and flows to the second break point 120, and then is grounded by the first grounding portion 15 (see The path P1) further excites a first working mode to generate a radiation signal in the first radiation frequency band.

When the second feeding portion 13 feeds current, the current flows through the first radiating portion F1 and flows to the first break point 119, and then is grounded by the first grounding portion 15 (see path P2), and then excite a second working mode to generate a radiation signal in the second radiation frequency band.

After the third feeding part 14 feeds current, the current will flow through the second radiating part F2 and flow to the first break point 119 (see path P3). In this way, the second radiating portion F2 constitutes a monopole antenna, and further excites a third working mode to generate a radiation signal of the third radiation frequency band. After the third feeding portion 14 feeds current, the current also flows into the second radiating portion F2, is coupled to the third radiating portion F3 via the third break point 121, and then flows into the The system ground plane 110 and the middle frame 112 are grounded (refer to path P4), and then a fourth working mode is excited to generate a radiation signal in the fourth radiation frequency band.

In this embodiment, the first working mode includes the Global Positioning System (GPS) mode and the WIFI 2.4 GHz mode. The second working mode is a WIFI 5GHz mode. The third working mode includes a Long Term Evolution Advanced (LTE-A) low frequency mode and an LTE-A intermediate frequency mode. The fourth working mode is an LTE-A high frequency mode. The frequencies of the first radiation band include 1575MHz and 2400-2484MHz. The frequency of the second radiation band is 5150-5850MHz. The frequencies of the third radiation band include 700-960MHz and 1710-2170MHz. Of the fourth radiation frequency band The frequency is 2300-2690MHz.

It can be understood that, in this embodiment, the second ground portion 16 is a middle/high band conditioner (MHC), which can be a capacitor or an inductor for adjusting the antenna structure 100 , High frequency band, and effectively improve its bandwidth and antenna efficiency.

It can be understood that, in this embodiment, the frame 111 and the system ground surface 110 are also electrically connected by elastic pieces, welding, probes, and the like. The position of the electrical connection point between the frame 111 and the system ground surface 110 can be adjusted according to the required low frequency frequency. For example, if the electrical connection point between the two is close to the corresponding feeding part, such as the third feeding part 14, the low frequency frequency of the antenna structure 100 is shifted to the high frequency. When the electrical connection point between the two is far away from the third feeding portion 14, the low frequency frequency of the antenna structure 100 shifts to a low frequency.

It can be understood that, in this embodiment, one end of the switching circuit 18 is electrically connected to the second radiating portion F2, and the other end is electrically connected to the system ground plane 110, that is, grounded. The switching circuit 18 is used to switch the second radiating portion F2 to the system ground plane 110 so that the second radiating portion F2 is not grounded, or to switch the second radiating portion F2 to a different one. The ground position (equivalent to switching to a different impedance element) can effectively adjust the bandwidth of the antenna structure 100 to achieve the function of multi-frequency adjustment.

It can be understood that, in this embodiment, the specific structure of the switching circuit 18 may be in various forms, for example, it may include a single switch, a multiple switch, a single switch with matching components, a multiple switch with matching components, and so on.

Please also refer to FIG. 8A. In one of the embodiments, the switching circuit 18 includes a single switch 18a. The single-circuit switch 18a includes a movable contact a1 and a static contact a2. The movable contact a1 is electrically connected to the second radiating part F2. The static contact a2 of the single switch 18a is electrically connected To the system ground surface 110. In this way, by controlling the opening or closing of the single-circuit switch 18a, the second radiating portion F2 is electrically connected or disconnected from the system ground surface 110, that is, the second radiating portion F2 is controlled to be grounded or Not grounded to achieve the function of multi-frequency adjustment.

Understandably, please also refer to FIG. 8B. In one of the embodiments, the switching circuit 18 includes a multiplexer 18b. In this embodiment, the multiplexer 18b is a four-way switch. The multiplexer 18b includes a moving contact b1, a first static contact b2, a second static contact b3, a third static contact b4, and a fourth static contact b5. The movable contact b1 is electrically connected to the second radiating part F2. The first stationary contact b2, the second stationary contact b3, the third stationary contact b4, and the fourth stationary contact b5 are electrically connected to different positions of the system ground plane 110, respectively.

By controlling the switching of the moving contact b1, the moving contact b1 can be switched to the first static contact b2, the second static contact b3, the third static contact b4, and the fourth static contact. Point b5. In this way, the second radiating portion F2 will be electrically connected to different positions of the system ground plane 110, thereby achieving the function of multi-frequency adjustment.

Understandably, please also refer to FIG. 8C. In one of the embodiments, the switching circuit 18 includes a single switch 18c and a matching element 181. The single-circuit switch 18c includes a movable contact c1 and a static contact c2. The movable contact c1 is electrically connected to the second radiating part F2. The static contact c2 is electrically connected to the system ground surface 110 through the matching element 181. The matching element 181 has a preset impedance. The matching element 181 may include an inductor, a capacitor, or a combination of an inductor and a capacitor.

Please also refer to FIG. 8D. In one of the embodiments, the switching circuit 18 includes a multiplexer 18d and at least one matching element 183. In this embodiment, the multiplexer 18d is a four-way switch, and the switching circuit 18 includes three matching elements 183. The multiplexer 18d includes a moving contact d1, a first static contact d2, a second static contact d3, and a third static contact d4. And the fourth fixed contact d5. The movable contact d1 is electrically connected to the second radiating part F2. The first static contact d2, the second static contact d3, and the third static contact d4 are electrically connected to the system ground surface 110 through corresponding matching elements 183, respectively. The fourth static contact d5 is suspended. Each matching element 183 has a predetermined impedance, and the predetermined impedance of the matching elements 183 may be the same or different. Each matching element 183 may include an inductor, a capacitor, or a combination of an inductor and a capacitor. The position where each matching element 183 is electrically connected to the system ground plane 110 can be the same or different.

It can be understood that by controlling the switching of the movable contact d1, the movable contact d1 can be switched to the first stationary contact d2, the second stationary contact d3, the third stationary contact d4, and the first stationary contact d2, respectively. Four fixed contacts d5. In this way, the second radiating portion F2 will be electrically connected to or disconnected from the system ground plane 110 through different matching elements 183, thereby achieving the function of multi-frequency adjustment.

FIG. 9 is a graph of S parameters (scattering parameters) when the antenna structure 100 works in the GPS mode and the WIFI 2.4 GHz mode. Wherein, when the switching circuit 18 switches to an inductance value of 68nH, 33nH, 16nH and 7.5nH respectively, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A Band17 frequency band (704-746MHz), LTE-A When A Band13 frequency band (746-787MHz), LTE-A Band20 frequency band (791-862MHz) and LTE-A Band8 frequency band (880-960MHz), the antenna structure 100 works in GPS mode and WIFI 2.4GHz mode. The S11 value is roughly the same. FIG. 10 is a graph of the total radiation efficiency when the antenna structure 100 works in the GPS mode and the WIFI 2.4 GHz mode. Wherein, when the switching circuit 18 switches to an inductance value of 68nH, 33nH, 16nH and 7.5nH respectively, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A Band17 frequency band (704-746MHz), LTE-A A Band13 frequency band (746-787MHz), LTE-A Band20 frequency band (791-862MHz) and LTE-A In the Band 8 frequency band (880-960 MHz), the total radiation efficiency of the antenna structure 100 when operating in the GPS mode and the WIFI 2.4 GHz mode is approximately the same.

FIG. 11 is a graph of S parameter (scattering parameter) when the antenna structure 100 works in the WIFI 5GHz mode. Wherein, when the switching circuit 18 switches to an inductance value of 68nH, 33nH, 16nH and 7.5nH respectively, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A Band17 frequency band (704-746MHz), LTE-A When the A Band 13 frequency band (746-787 MHz), the LTE-A Band 20 frequency band (791-862 MHz) and the LTE-A Band 8 frequency band (880-960 MHz), the S11 value of the antenna structure 100 when operating in the WIFI 5GHz mode is approximately the same.

FIG. 12 is a graph of the total radiation efficiency when the antenna structure 100 works in the WIFI 5GHz mode. Wherein, when the switching circuit 18 switches to an inductance value of 68nH, 33nH, 16nH and 7.5nH respectively, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A Band17 frequency band (704-746MHz), LTE-A When the A Band13 frequency band (746-787MHz), the LTE-A Band20 frequency band (791-862MHz) and the LTE-A Band8 frequency band (880-960MHz), the total radiation efficiency of the antenna structure 100 when working in the WIFI 5GHz mode is approximately the same .

FIG. 13 is a graph of S parameters (scattering parameters) when the antenna structure 100 works in LTE-A low, medium, and high frequency modes. Wherein, the curve S131 is when the switching circuit 18 switches to an inductance value of 68nH, the antenna structure 100 works in the LTE-A Band17 frequency band (704-746MHz) and LTE-A mid- and high-frequency mode S11 value. The curve S132 is the S11 value when the switching circuit 18 switches to an inductance value of 33nH when the antenna structure 100 operates in the LTE-A Band13 frequency band and the LTE-A mid- and high-frequency modes. Curve S133 is S11 when the switching circuit 18 switches to an inductance value of 16nH and the antenna structure 100 works in the LTE-A Band20 frequency band (791-862MHz) and LTE-A mid- and high-frequency modes. value. Curve S134 is the S11 value of the antenna structure 100 when the switching circuit 18 switches to an inductance value of 7.5nH when the antenna structure 100 operates in the LTE-A Band8 frequency band (880-960MHz) and LTE-A mid- and high-frequency modes .

FIG. 14 is a graph showing the total radiation efficiency of the antenna structure 100 when operating in LTE-A low, medium and high frequency modes. Wherein, the curve S141 is the total when the switching circuit 18 switches to an inductance value of 68nH when the antenna structure 100 works in the LTE-A Band17 frequency band (704-746MHz) and the LTE-A mid- and high-frequency modes Radiation efficiency. The curve S142 is the total radiation efficiency of the antenna structure 100 when the switching circuit 18 switches to an inductance value of 33 nH when the antenna structure 100 operates in the LTE-A Band 13 frequency band and the LTE-A mid- and high-frequency modes. Curve S143 shows the total radiation efficiency of the antenna structure 100 when the switching circuit 18 switches to an inductance of 16nH when the antenna structure 100 operates in the LTE-A Band20 frequency band (791-862MHz) and LTE-A mid- and high-frequency modes . Curve S144 is the total radiation when the antenna structure 100 works in the LTE-A Band8 frequency band (880-960MHz) and the LTE-A mid- and high-frequency modes when the switching circuit 18 switches to an inductance value of 7.5nH. effectiveness.

Obviously, it can be seen from FIGS. 9 to 14 that the antenna structure 100 is provided with the switching circuit 18 to switch the low-frequency modes of the antenna structure 100, which can effectively increase the low-frequency bandwidth and have the highest frequency. Good antenna efficiency. Furthermore, when the antenna structure 100 works in the LTE-A Band17 frequency band (704-746MHz), the LTE-A Band13 frequency band (746-787MHz), the LTE-A Band20 frequency band (791-862MHz) and the LTE-A Band8 frequency band, respectively (880-960MHz), the LTE-A middle and high frequency bands of the antenna structure 100 are both 1710-2690MHz, and the antenna structure 100 can also cover the corresponding GPS frequency band, WIFI 2.4GHz frequency band and WIFI 5GHz Frequency band. That is, when the switching circuit 18 switches, the switching circuit 18 is only used to change the The low-frequency mode of the antenna structure 100 does not affect the middle and high-frequency modes, which is beneficial to the carrier aggregation (CA) application of LTE-A.

In other words, the antenna structure 100 can generate various operating modes, such as low frequency mode, intermediate frequency mode, high frequency mode, GPS mode, and WIFI 2.4 GHz mode through the switching of the switching circuit 18 And WIFI 5GHz mode, covering the communication frequency band commonly used in the world. Specifically, the antenna structure 100 can cover GSM850/900/WCDMA Band5/Band8/Band13/Band17/Band20 at low frequencies, GSM 1800/1900/WCDMA 2100 (1710-2170MHz) at intermediate frequencies, and LTE- A Band7, Band40, Band41 (2300-2690MHz), it can also cover GPS frequency band, Wi-Fi 2.4GHz frequency band and Wi-Fi 5GHz frequency band. The designed frequency band of the antenna structure 100 can be applied to the operation of GSM Qual-band, UMTS Band I/II/V/VIII frequency bands, and LTE 850/900/1800/1900/2100/2300/2500 frequency bands commonly used in the world.

Of course, it can be understood that in other embodiments, the switching circuit 18 is not limited to be electrically connected to the second radiating portion F2, and its position can be adjusted according to specific requirements. For example, the switching circuit 18 may be electrically connected to the first radiating part F1 or the third radiating part F3.

In summary, the antenna structure 100 of the present invention is divided from the frame 111 by providing at least one break point (for example, the first break point 119, the second break point 120, and the third break point 121) on the frame 111 At least three radiating parts. The antenna structure 100 is also provided with the switching circuit 18, which can cover multiple frequency bands such as low frequency, intermediate frequency, high frequency, GPS, Wi-Fi 2.4GHz and Wi-Fi 5GHz by different switching methods, and As a result, the radiation of the antenna structure 100 has a wider frequency effect than that of a general metal back cover antenna. The antenna structure 100 can increase the low frequency bandwidth and has better antenna efficiency, covering global frequency band applications and supporting carrier aggregation (carrier aggregation). Aggregation, CA) application requirements. In addition, it is understandable that the antenna structure 100 of the present invention has a front full screen, and the antenna structure 100 still has a good performance in the unfavorable environment where the all-metal back plate 113, the frame 111 and a large amount of metal surround it.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made according to the spirit of the present invention should all be included in the scope of protection claimed by the present invention.

110: System ground plane

118: Slotting

119: The first breakpoint

120: second breakpoint

121: Third Breakpoint

130: circuit board

F1: The first radiation department

F2: The second radiating part

F3: Third Radiation Department

12: The first feed-in part

13: The second feed-in part

14: The third feed-in part

15: The first grounding part

16: The second ground part

18: Switching circuit

21: The first electronic component

23: The second electronic component

25: The third electronic component

27: The fourth electronic component

Claims (10)

An antenna structure. The improvement is that the antenna structure includes a housing, a first feeding portion, a second feeding portion, and a first grounding portion. The housing includes a metal frame, a metal middle frame, and an all-metal back plate. The metal middle frame is arranged parallel to the all-metal back plate, the metal frame is arranged around the edge of the all-metal back plate, the metal frame is provided with a first breaking point and a second breaking point, the all-metal back The board is provided with a slot, and the slot, the first break point and the second break point jointly divide the first radiation part from the metal frame, the first break point and the second break point The metal frame between the break points forms the first radiating part, and the first feeding part and the second feeding part are spaced apart, and both are electrically connected to the first radiating part to form the first radiating part. The radiating part feeds current, one end of the first grounding part is electrically connected to the ground plane of the system, and the other end is electrically connected to the first radiating part to provide a ground for the first radiating part. When the first feeding part After the current is fed in, the current flows through the first radiating part and flows to the second breakpoint, thereby exciting the GPS mode and the WIFI 2.4GHz mode. When the second feeding part feeds the current, The current flows through the first radiating part and flows to the first breaking point, thereby exciting the WIFI 5GHz mode. The antenna structure according to claim 1, wherein the antenna structure further includes a third feed-in portion, and a third breakpoint is also provided on the metal frame, between the first breakpoint and the third breakpoint The metal frame forms a second radiating part, and the third feeding part is electrically connected to the second radiating part for feeding current to the second radiating part. The antenna structure according to claim 2, wherein the frame at least includes an end portion, a first side portion, and a second side portion, and the first side portion and the second side portion are respectively connected to two of the end portions The slot is opened on a side of the metal back plate close to the end portion, and respectively extends in the direction of the first side portion and the second side portion, and the first breaking point is opened on the The end portion, the second break point is opened on the first side portion, the third break point is opened on the end portion, the third break point and the slot are located between the second side portion The border between the end points A third radiating part is formed, and the metal middle frame, the all-metal back plate, and the metal frames other than the first to third radiating parts are connected to each other to form the system ground plane, so as to provide a ground for the antenna structure. The antenna structure according to claim 3, wherein after the third feeding part feeds current, the current flows through the second radiating part, and flows to the first break point, thereby exciting an LTE-A Low frequency mode and LTE-A intermediate frequency mode; after the third feeding part feeds current, the current also flows into the second radiating part, and is coupled to the second radiating part through the third break point The three radiating parts flow into the system ground plane and the metal middle frame to excite an LTE-A high-frequency mode. The antenna structure according to claim 4, wherein the antenna structure further includes a second grounding portion, the first grounding portion is provided between the first feeding portion and the second feeding portion, and the second One end of the grounding part is electrically connected to the system ground plane, and the other end is electrically connected to the third radiating part, so as to provide a ground for the third radiating part and adjust the LTE-A mid- and high-frequency bands. The antenna structure according to claim 3, wherein the antenna structure further includes a switching circuit, one end of the switching circuit is electrically connected to the first radiating part, the second radiating part, or the third radiating part One, the other end is electrically connected to the system ground plane. The antenna structure according to claim 6, wherein the switching circuit includes a single-circuit switch, the single-circuit switch includes a moving contact and a static contact, the moving contact is electrically connected to one of the radiating parts, and the static The contact is directly electrically connected to the system ground plane or is electrically connected to the system ground plane through a matching element, and the matching element has a preset impedance. The antenna structure according to claim 6, wherein the switching circuit includes a multiple switch, and the multiple switch includes a movable contact, a first fixed contact, a second fixed contact, a third fixed contact, and a fourth A stationary contact, the movable contact is electrically connected to one of the radiating parts, the first stationary contact, the second stationary contact, and the third stationary contact are directly electrically connected to different positions on the ground plane of the system or The corresponding matching element is electrically connected to different positions of the system ground plane, the fourth static contact is directly electrically connected to the system ground plane or is set in the air, and the matching element has a preset impedance. A wireless communication device, which is improved in that the wireless communication device includes the antenna structure according to any one of claims 1 to 8. The wireless communication device according to claim 9, wherein the wireless communication device further includes a display unit, the display unit is accommodated in an opening on one side of the metal frame, and the display unit is a full screen.

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