TWM594814U - Dual antenna system - Google Patents

Abstract

This case provides a dual-antenna system, which includes a dielectric substrate having opposite first sides and second sides. The ground portion is located on the first side of the dielectric substrate. The first and second metal branches are located on the dielectric substrate and adjacent to the second side. The first end of the first metal branch and the first end of the second metal branch extend toward the first side and connect to the ground, The first and second metal branches are each bent from the second end and extend in a direction perpendicular to the second side. The resonance element is connected to the first and second metal branches, so that part of the first metal branch, part of the second metal branch, the resonance element and the grounding portion form a loop structure. The first feed branch and the second end of the first metal branch are separated by a first coupling distance, and the second feed branch and the second end of the second metal branch are separated by a second coupling distance. The first feeding part is connected to the first feeding branch and the ground part, and the second feeding part is connected to the second feeding branch and the ground part.

Description

Dual antenna system

This case relates to a dual antenna system that is reduced in size and has low coupling characteristics.

Due to the high screen ratio and narrow bezel design of electronic products, the design space of antennas will continue to shrink, and in order to meet consumer demand for wireless communication speed, multi-band and multi-antenna technologies have also been introduced into the design of electronic products, so When the space continues to shrink and the number of antennas increases, the interference between the antennas will increase, resulting in low efficiency and greatly affecting the channel capacity, which will reduce the speed of wireless communication and the quality of communication.

In order to improve the interference between the antennas and increase the channel capacity, the existing method is to increase the distance between the dual antennas to improve the isolation of the antenna, but this method is often impossible to achieve in the case of limited space. Another way is to add a resonance unit between the two antennas to make the resonance units resonate at the same frequency, reduce the coupling energy of the antennas and improve the isolation between the two antennas. Although this method can reduce the interference between the antennas and improve Isolation, but it still needs to increase the size of the antenna to have a chance to achieve, but in the case of limited space, it will become very difficult to increase the size or number of antennas in order to increase the speed, and it must make the antennas not interfere with each other.

This case provides a dual-antenna system, including a dielectric substrate, a ground, a first metal branch, a second metal branch, a resonance element, a first feed-in branch, a second feed-in branch, A first feeding part and a second feeding part. The dielectric substrate includes a first side and a second side opposite to each other. The ground portion is located on the first side of the dielectric substrate. The first metal branch is located on the dielectric substrate and adjacent to the second side. The first metal branch has a first end and a second end. The first end of the first metal branch extends toward the first side and is connected to ground The first metal branch is bent from the second end and extends perpendicular to the second side. The second metal branch is located on the dielectric substrate and adjacent to the second side. The second metal branch has a first end and a second end close to the first end of the first metal branch. One end extends toward the first side and connects to the ground, and the second metal branch is bent from the second end and extends in a direction perpendicular to the second side. The resonance element is located on the second side of the dielectric substrate and connects the first metal branch and the second metal branch, so that part of the first metal branch, part of the second metal branch, the resonance element and the grounding portion form a loop structure. The first feed branch is located on the dielectric substrate and is adjacent to the first metal branch, the first feed branch is separated from the second end of the first metal branch by a first coupling distance, and the first feed branch is along The second side edge extends away from the loop structure. The second feed branch is located on the dielectric substrate and is adjacent to the second metal branch. The second feed branch is separated from the second end of the second metal branch by a second coupling distance, and the second feed branch is along The second side edge extends away from the loop structure. The first feeding part is connected to the first feeding branch and the ground part. The second feeding part is connected to the second feeding branch and the ground part.

In summary, in addition to the resonance mode of the antenna itself, a dual antenna system that is reduced in size and has low coupling characteristics is added a resonance element (capacitor) between the two metal branches. The structural design of the loop structure formed by some metal branches and the grounding part can effectively improve the isolation, so it can effectively reduce the size of the antenna, and at the same time it can have the characteristics of high isolation antenna. Therefore, this case can improve the coverage and quality of wireless communication at the same time without increasing the space of electronic products.

FIG. 1 is a schematic structural diagram of a dual antenna system according to an embodiment of the present case. Referring to FIG. 1, a dual antenna system 1 includes a dielectric substrate 10, a ground portion 12, a first metal branch 14, and a first Two metal branches 16, a capacitor 18 as a resonance element, a first feed branch 20, a second feed branch 22, a common metal section 24, a first feed portion 26 and a second feed portion 28. The first antenna unit 30 includes a first metal branch 14, a first feeding branch 20 and a first feeding section 26, and the second antenna unit 32 includes a second metal branch 16 and a second feeding branch 22和一个第一Feeding portion 28. The dielectric substrate 10 includes two opposite long sides, a first side 101 and a second side 102, and the first side 101 and the second side 102 are parallel to each other, provided on the surface of the dielectric substrate 10 The first antenna unit 30, the capacitor 18, the common metal segment 24, and the second antenna unit 32. The capacitor 18 is located on the second side 102 of the dielectric substrate 10 and between the first metal branch 14 and the second metal branch 16, the capacitor 18 connects the first metal branch 14 and the second metal branch 16, so that A metal branch 14, a part of the second metal branch 16, the capacitor 18, the common metal segment 24 and the ground portion 12 form a loop structure 34.

In this dual antenna system 1, the ground portion 12 is located on the first side 101 of the dielectric substrate 10. The first metal branch 14 is located on the dielectric substrate 10 and adjacent to the second side 102. The first metal branch 14 has a first end 141 and a second end 142. The first metal branch 14 further includes a first bend Folding portion 143, the first metal branch 14 extends vertically from the first end 141 to the first side 101 to form a first bending portion 143, and is connected to one end of the common metal segment 24 through the first bending portion 143, The other end of the common metal section 24 is connected to the ground portion 12, the first metal branch 14 further includes a first vertical section 144 and a first horizontal section 145, the first metal branch 14 is bent from the second end 142 and merged The first vertical section 144 extends toward the direction perpendicular to the second side 102. The first horizontal section 145 vertically connects the first vertical section 144 and extends toward the loop structure 34. The second metal branch 16 is located on the dielectric substrate 10 and adjacent to the second side 102. The second metal branch 16 has a first end 161 and a second end 162 close to the first end 141 of the first metal branch 14 The second metal branch 16 further includes a second bending portion 163. The second metal branch 16 extends vertically from the first end 161 toward the first side 101 to form a second bending portion 163, and The second bending portion 163 is connected to the common metal segment 24. The second metal branch 16 further includes a second vertical section 164 and a second horizontal section 165. The second metal branch 16 is bent from the second end 162 and extends in a direction perpendicular to the second side 102 to form a second The vertical section 164 and the second horizontal section 165 are vertically connected to the second vertical section 164 and extend toward the loop structure 34. In this embodiment, the first metal branch 14 and the second metal branch 16 are connected to the grounding portion 12 through the common metal segment 24, so the first metal branch 14, the common metal segment 24, and the second metal branch 16 series connected together. The first feed branch 20 is located on the dielectric substrate 10 and is adjacent to the first metal branch 14. The first feed branch 20 is separated from the second end 142 of the first metal branch 14 by a first coupling distance D1 (also That is, the first feed branch 20 is separated from the first vertical section 144 by a first coupling distance D1). The first feeding branch 20 further includes a third bending portion 201, and the first feeding branch 20 extends along the second side 102 away from the loop structure 34 (ie, the first feeding branch 20 Extending toward the short side of the dielectric substrate 10), and bent in a direction perpendicular to the second side 102 to form a third bent portion 201. The second feed branch 22 is located on the dielectric substrate 10 and is adjacent to the second metal branch 16. The second feed branch 22 is separated from the second end 162 of the second metal branch 16 by a second coupling distance D2 (also That is, the second feed branch 22 is separated from the second vertical section 164 by a second coupling distance D2). The second feed branch 22 further includes a fourth bent portion 221, and the second feed branch 22 extends along the second side 102 away from the loop structure 34 (ie, the second feed branch 22 Extending toward the short side of the dielectric substrate 10), and bent toward the direction perpendicular to the second side 102 to form a fourth bent portion 221. The first feeding portion 26 connects the first feeding branch 20 and the grounding portion 12 so that the first antenna unit 30 transmits or receives radio frequency signals. The second feeding part 28 connects the second feeding branch 22 and the grounding part 12 so that the second antenna unit 32 transmits or receives radio frequency signals.

In an embodiment, the first feed branch 20 further includes a third horizontal section 202. The first feed branch 20 is connected to the first end of the first metal branch 14 from the end of the first feed branch 20 connected to the first feed section 26. The third horizontal section 202 extends in the direction of the horizontal section 145 so that the third horizontal section 202 is also separated from the first horizontal section 145 by the first coupling distance D1. The second feed branch 22 further includes a fourth horizontal section 222. The second feed branch 22 extends from one end of the second feed section 28 connected to the second feed section 28 along the direction of the second horizontal section 165 of the second metal branch 16 The fourth horizontal section 222 makes the fourth horizontal section 222 and the second horizontal section 165 separated by a second coupling distance D2.

In one embodiment, the range of the first coupling pitch D1 and the second coupling pitch D2 is between 0.1 and 3 mm.

In addition, the ground portion 12 of the dual antenna system 1 is more electrically connected to a system ground plane 36, which is located outside the first side 101 of the dielectric substrate 10. In one embodiment, the system ground plane 36 can be a separate metal sheet or located on a metal plane of an electronic device. For example, the system ground plane 36 can be a metal chassis of an electronic device or a plastic chassis of an electronic device Internal metal parts, but not limited to this. The size of the system ground plane 36 is only for illustration, and the size of the system ground plane 36 may change with the application of the dual antenna system 1.

In an embodiment, the first metal branch 14 and the first feed branch 20 of the first antenna unit 30, the second metal branch 16 and the second feed branch 22 of the second antenna unit 32, The common metal segment 24 is made of conductive metal material, such as silver, copper, aluminum, iron, or alloys thereof, but it is not limited thereto.

As shown in FIG. 1, with the common metal segment 24 as the center, the first antenna unit 30 and the second antenna unit 32 are mirror-symmetrical to each other, and can support dual-band operation, including a low-band operation and a High frequency band operation. In the first antenna unit 30, when operating in a high frequency band, the first feed section 26 feeds the radio frequency signal into the first feed branch 20 as a resonance path to form a monopole antenna with a wavelength of about 0.25 times Frequency band operation produces a resonance mode; during low frequency band operation, the first feed branch 20 will couple to the first metal branch 14 so that the first metal branch 14 is excited to resonate at a loop current of about 0.25 times the wavelength, This loop current generates a resonant mode during low-band operation. Similarly, in the second antenna unit 32, when operating in a high frequency band, the second feeder 28 feeds the RF signal into the second feeder branch 22 as a resonance path to form a monopole antenna with a wavelength of about 0.25 times The operation in the high frequency band produces a resonance mode; in the low frequency band operation, the second feed branch 22 will couple to the second metal branch 16 so that the second metal branch 16 will resonate and resonate about 0.25 times the wavelength. Loop current. This loop current generates a resonance mode when operating in the low frequency band. In addition, the first coupling pitch D1 between the first feed branch 20 and the first metal branch 14 and the second coupling pitch D2 between the second feed branch 22 and the second metal branch 16 are respectively formed A distributed coupling capacitor can adjust the antenna matching and frequency offset by adjusting the value of the distributed coupling capacitor to improve the freedom of antenna matching and frequency adjustment. Among them, the value of the distributed coupling capacitance of the first antenna unit 30 is related to the first coupling distance D1 and the length of the corresponding overlapping of the first feed branch 20 and the first metal branch 14, the second antenna unit 32 The value of the distributed coupling capacitance is related to the second coupling distance D2 and the length of the corresponding overlap between the second feed branch 22 and the second metal branch 16.

In this case, two sets of different resonance structures are designed in a frequency band, and the coupling energy between the first antenna unit 30 and the second antenna unit 32 is reduced by a design in which the partial currents are 180 degrees out of phase. As shown in FIG. 1, when the RF signal is fed into the first antenna unit 30 from the first feeder 26 to excite energy, a first resonance frequency will be generated at a low frequency. As shown in FIG. 2, at the first resonance frequency A current direction is generated on the first metal branch 14 of the first antenna unit 30, and an opposite current direction is generated on the second metal branch 16 of the second antenna unit 32. These two current directions are called This is the first current path, and its current direction is about mirror symmetry around the common metal segment 24. And while the first antenna unit 30 is excited, part of the first metal branch 14, the common metal segment 24, part of the second metal branch 16, the capacitor 18, and the ground portion 12 form a loop structure 34, and the loop structure 34 The loop inductance is formed and resonates with the capacitor 18 to generate a second resonance frequency. As shown in FIG. 3, at the second resonance frequency, the first metal branch 14 of the first antenna unit 30 and the second antenna unit 32 The second metal branch 16 generates a co-current current direction, and the current path generated by the second resonance frequency is called a second current path. Referring to the current directions of FIG. 2 and FIG. 3 at the same time, it can be found that the current direction on the second antenna unit 32 is opposite, indicating that the current phase on the second antenna unit 32 is 180 degrees out of phase, so when the first antenna When the unit 30 is excited, the currents above the second antenna unit 32 will cancel each other out, so that the current on the first antenna unit 30 cannot flow to the second feeding portion 28 of the second antenna unit 32, which can greatly improve the isolation .

Similarly, as shown in FIG. 1, when the RF signal is fed into the second antenna unit 32 from the second feeder 28 to excite energy, a first resonance frequency will be generated at a low frequency, as shown in FIG. 2, at the first resonance At a frequency, a current direction is generated on the second metal branch 16 of the second antenna unit 32, and a current direction in the opposite direction is generated on the first metal branch 14 of the first antenna unit 30. The direction of the current is called the first current path, and while the second antenna unit 32 is excited, the loop structure 34 will form a loop inductance and resonate with the capacitor 18 to generate a second resonance frequency, as shown in FIG. 4, At the second resonance frequency, the second metal branch 16 of the second antenna unit 32 and the first metal branch 14 of the first antenna unit 30 generate a co-current direction, and the current path generated by the second resonance frequency is called This is the second current path. With reference to the current directions of FIG. 2 and FIG. 4, it can be found that the current direction on the first antenna unit 30 is opposite, indicating that the current phase on the first antenna unit 30 is 180 degrees out of phase. Therefore, when the second antenna unit 32 is excited, the currents above the first antenna unit 30 will cancel each other, so that the current on the second antenna unit 32 cannot flow to the first feeding portion 26 of the first antenna unit 30 , You can greatly improve the isolation.

Among them, the second resonance frequency can be effectively changed by adjusting the value of the capacitor 18 and the length of the loop structure 34. In addition, if the best antenna isolation is obtained, the first resonance frequency and the second resonance frequency can be adjusted To the same resonant frequency, and the resonant frequency will fall somewhere between 2400MHz and 2500MHz to meet the required bandwidth.

In one embodiment, this case does not limit the use of common metal segments, please refer to FIG. 5. The components of the dual antenna system 1 of FIG. 5 are roughly similar to the components of the dual antenna system 1 of FIG. 1. The dual antenna system 1 of FIG. 5 also includes a dielectric substrate 10, a ground portion 12, a first metal branch 14, a The second metal branch 16, a capacitor 18 as a resonance element, a first feeding branch 20, a second feeding branch 22, a first feeding portion 26, and a second feeding portion 28. The difference between the dual antenna system 1 of FIG. 5 and the dual antenna system 1 of FIG. 1 is that the first end 141 of the first metal branch 14 of the dual antenna system 1 of FIG. 5 extends vertically to the first side 101 and is directly connected To the ground portion 12, the first end 161 of the second metal branch 16 extends vertically to the first side 101 and is directly connected to the ground portion 12. The remaining structural features are the same as those in the previous embodiment, and will not be repeated here. The induced current on the loop structure 34 shown in FIG. 5 can also generate loop inductance and form a resonance (second resonance frequency) with the capacitor 18, thereby achieving the effect of improving isolation.

Please refer to FIG. 6. In an embodiment, in order to increase the length of the loop structure 34, the first metal branch 14 further includes a first bent portion 143. The first metal branch 14 extends vertically from the first end 141 to the One side 101 extends to form a first bent portion 143, and is connected to the ground portion 12 through the first bent portion 143. The second metal branch 16 further includes a second bent portion 163. The second metal branch 16 extends vertically from the first end 161 toward the first side 101 to form a second bent portion 163, and The folded portion 163 is connected to the ground portion 12. In the dual antenna system 1, the length of the loop structure 34 is increased by the first bending portion 143 and the second bending portion 163, and the second resonance frequency is adjusted according to the value of the capacitor 18. In the present embodiment, the first bending portion 143 and the second bending portion 163 are designed in a relative shape, but not limited to this. The induced current on the loop structure 34 shown in FIG. 6 can also generate loop inductance and form resonance with the capacitor 18, which can also improve the isolation.

Inherited, regardless of the dual antenna system 1 shown in FIG. 1, FIG. 5 or FIG. 6, the first antenna unit 30 and the second antenna unit 32 with mirror symmetry configuration will contribute to the dual antenna system 1 Design can reduce the complexity of antenna design.

The dual-antenna system proposed in this case does have good isolation in both the low-frequency band and the high-frequency band. Please refer to FIG. 7, FIG. 8 and FIG. 9 at the same time. FIG. 7 is a schematic diagram of the actual size of the dual antenna system according to an embodiment of the present case. In this dual antenna system 1, the first coupling distance D1 and the second coupling distance D2 is 0.3 mm, the actual total length of the first antenna unit 30 and the second antenna unit 32 is 29.4 mm, and the width of the entire dual antenna system 1 is only 5 mm, which is actually the structure of a small size dual antenna system 1 The design uses this dual-antenna system 1 to simulate S-parameters when transmitting RF signals. When operating in the low frequency band (2.4 GHz), the S-parameter simulation results are shown in Figure 8. The isolation curve (S21) below the diagram is less than -15 dB in the frequency band, indicating that the isolation is greater than 15 dB, so It has good isolation when operating in the low frequency band. When operating in the high frequency band (5 GHz), the S-parameter simulation results are shown in Figure 9. The isolation curve (S21) below the diagram is less than -15 dB in the frequency band, indicating that the isolation is greater than 15 dB, so It also has good isolation under high-band operation. Therefore, the dual-antenna system 1 of this case has good isolation under dual-band operation.

In summary, in a dual antenna system with reduced size and low coupling characteristics, the first metal branch of the first antenna unit and the second metal branch of the second antenna unit are close to each other (and connected together The common metal segment is connected to the ground), which effectively saves the antenna space required by the dual antenna system. In terms of isolation, in addition to the resonance mode of the antenna itself, a resonance element (capacitor) is added between the first metal branch and the second metal branch. With the resonance element, part of the metal branch and the ground The structural design of the formed loop structure can effectively improve the isolation, so the size of the antenna can be effectively reduced in this case, and at the same time it can have the characteristics of high isolation antenna. Therefore, this case can improve the coverage and quality of wireless communication at the same time without increasing the space of electronic products.

The above-mentioned embodiments are only to illustrate the technical ideas and features of this case, and its purpose is to enable those familiar with this technology to understand the contents of this case and implement it accordingly, but cannot limit the patent scope of this case, that is, according to this case Equal changes or modifications made by the disclosed spirit should still be covered by the patent application in this case.

1: Dual antenna system 10: dielectric substrate 101: first side 102: second side 12: Ground 14: The first metal branch 141: The first end 142: Second end 143: First bend 144: first vertical segment 145: the first horizontal section 16: Second metal branch 161: The first end 162: Second end 163: Second bend 164: Second vertical segment 165: Second horizontal section 18: capacitance 20: First feed branch 201: Third bend 202: third horizontal section 22: Second feed-in branch 221: Fourth bend 222: Fourth horizontal section 24: Common metal segment 26: First Feeding Department 28: Second feed-in 30: The first antenna unit 32: Second antenna unit 34: Loop structure 36: System ground plane D1: First coupling pitch D2: Second coupling pitch

FIG. 1 is a schematic structural diagram of a dual-antenna system according to an embodiment of the present case. FIG. 2 is a schematic diagram of a first current path of the dual antenna system according to FIG. 1. FIG. 3 is a schematic diagram of a second current path of the first antenna unit of the dual antenna system of FIG. 1. 4 is a schematic diagram of a second current path of the second antenna unit of the dual antenna system of FIG. 1. 5 is a schematic structural diagram of a dual-antenna system according to another embodiment of the present case. 6 is a schematic structural diagram of a dual-antenna system according to yet another embodiment of the present case. 7 is a schematic diagram of the actual size of the dual antenna system according to an embodiment of the present case. 8 is a schematic diagram of S-parameter simulation generated at low frequency according to an embodiment of the dual-antenna system of the present case. 9 is a schematic diagram of S-parameter simulation generated at high frequency according to an embodiment of the dual-antenna system of the present case.

1: Dual antenna system

10: dielectric substrate

101: first side

102: second side

12: Ground

14: The first metal branch

141: The first end

142: Second end

143: First bend

144: first vertical segment

145: the first horizontal section

16: Second metal branch

161: The first end

162: Second end

163: Second bend

164: Second vertical segment

165: Second horizontal section

18: capacitance

20: First feed branch

201: Third bend

202: third horizontal section

22: Second feed-in branch

221: Fourth bend

222: Fourth horizontal section

24: Common metal segment

26: First Feeding Department

28: Second feed-in

30: The first antenna unit

32: Second antenna unit

34: Loop structure

36: System ground plane

D1: First coupling pitch

D2: Second coupling pitch

Claims (10)

A dual-antenna system, including: A dielectric substrate, including a first side and a second side opposite to each other; A grounding portion located on the first side of the dielectric substrate; A first metal branch is located on the dielectric substrate and adjacent to the second side. The first metal branch has a first end and a second end. The first end of the first metal branch faces the The first side extends and connects to the ground, and the first metal branch is bent from the second end and extends in a direction perpendicular to the second side; A second metal branch located on the dielectric substrate and adjacent to the second side, the second metal branch has a first end and a second end close to the first end of the first metal branch, The first end of the second metal branch extends toward the first side and connects to the grounding portion, the second metal branch is bent from the second end and extends in a direction perpendicular to the second side; A resonance element located on the second side of the dielectric substrate and connecting the first metal branch and the second metal branch so that part of the first metal branch, part of the second metal branch, and the resonance The element and the grounding part form a loop structure; A first feed branch located on the dielectric substrate and adjacent to the first metal branch, the first feed branch is separated from the second end of the first metal branch by a first coupling distance, and The first feeding branch extends along the second side in a direction away from the loop structure; A second feed-in branch located on the dielectric substrate and adjacent to the second metal branch, the second feed-in branch is separated from the second end of the second metal branch by a second coupling distance, and The second feeding branch extends along the second side in a direction away from the loop structure; A first feeding part connecting the first feeding branch and the ground part; and A second feeding part is connected to the second feeding branch and the ground part. The dual antenna system according to claim 1, further comprising a common metal section, one end of which is connected to the first end of the first metal branch and the first end of the second metal branch, the common metal section The other end is connected to the grounding portion, so that part of the first metal branch, part of the second metal branch, the resonant element and the common metal segment form the loop structure. The dual antenna system according to claim 2, wherein the first metal branch further includes a first bent portion, and the first metal branch extends vertically from the first end to the first side to form the first A bent portion; and the second metal branch further includes a second bent portion, the second metal branch extends perpendicularly from the first end to the first side to form the second bent portion, and The first bending portion and the second bending portion are connected to the common metal segment. The dual antenna system according to claim 1, wherein the first metal branch further includes a first bent portion, and the first metal branch extends vertically from the first end to the first side to form the first A bent portion; and the second metal branch further includes a second bent portion, the second metal branch extends perpendicularly from the first end to the first side to form the second bent portion, and The first bending portion and the second bending portion are connected to the ground portion. The dual antenna system according to claim 1, wherein the first metal branch further includes a first vertical section, the first metal branch is bent from the second end and extends toward the second side The first vertical section, the first feed branch is separated from the first vertical section by the first coupling distance; and the second metal branch further includes a second vertical section, the second metal branch from the The second end is bent and extends toward a direction perpendicular to the second side to form the second vertical section, and the second feed branch is separated from the second vertical section by the second coupling distance. The dual antenna system according to claim 5, wherein the first metal branch further includes a first horizontal section, the first horizontal section is vertically connected to the first vertical section and extends toward the loop structure; and the second The metal branch further includes a second horizontal section that is vertically connected to the second vertical section and extends toward the loop structure. The dual-antenna system according to claim 6, wherein the first feed branch further includes a third horizontal section, and the first feed branch branches from an end connected to the first feed section along the first horizontal section The third horizontal section extends in a direction so that the third horizontal section and the first horizontal section are separated by the first coupling distance; and the second feed branch further includes a fourth horizontal section, the second feed branch The path extends from the one end connecting the second feed portion along the direction of the second horizontal section to the fourth horizontal section, so that the fourth horizontal section and the second horizontal section are separated by the second coupling distance. The dual-antenna system according to claim 1, wherein the first feeding branch further includes a third bending portion, the first feeding branch is along the second side facing away from the loop structure Extending in the direction and being bent in a direction perpendicular to the second side to form the third bending portion; and the second feeding branch further includes a fourth bending portion, the second feeding branch is along the first The two side edges extend away from the loop structure and are bent in a direction perpendicular to the second side edge to form the fourth bent portion. The dual antenna system according to claim 1, wherein the resonance element is a capacitor. The dual-antenna system according to claim 1, wherein the ground portion is further connected to a system ground plane.

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