TWM627483U - Dual-antennas system - Google Patents

Abstract

This application discloses a dual antenna system, which is provided with a grounding portion, a common radiating portion, a first feeding branch, a second feeding branch, a first feeding source, a second feeding source, and a first parasitic on a dielectric substrate. branch and second parasitic branch. The ground portion is adjacent to the first long side of the dielectric substrate, and the common radiation portion is adjacent to the second long side of the dielectric substrate. The first and second feed-in branches are respectively connected to the common radiating part and extend toward the ground part, so that a matching slot is formed between the common radiating part, the first feed-in branch, the ground part and the second feed-in branch . The first feed-in source is electrically connected to the first feed-in branch and the ground portion, and the second feed-in source is electrically connected to the second feed-in branch and the ground portion. The first parasitic branch is connected to the ground part and extends toward the common radiation part, so that the first parasitic branch and the first feeding branch are separated by a first coupling distance. The second parasitic branch is connected to the grounding portion and extends toward the common radiation portion, so that the second parasitic branch is separated from the second feeding branch by a second coupling distance.

Description

Dual Antenna System

This case relates to a dual-antenna system that is downsized and has low coupling characteristics at the same time.

As the exterior design of notebook computers is becoming more and more compact, the internal space of the case is relatively reduced, but in the case of continuous reduction in size, the design space for the antenna has long been insufficient, so the design of antenna integration is becoming more and more important. more and more attention. Furthermore, in order to meet consumers' demand for wireless communication speed, the frequency of wireless communication is also moved to high frequency, in order to have a wider bandwidth to increase the transmission capacity, but due to institutional limitations, the antenna radiates at high frequency. It is easy to have dead ends.

On the other hand, in order to improve the isolation between multiple antennas, the existing method is to increase the distance between the antennas to improve the antenna isolation, but this is often impossible under the premise of limited space. Another way is to add a resonant element between the two antennas to reduce the coupling energy between the antennas and improve the isolation between the two antennas. However, although this method can reduce the dryness between the antennas and improve the isolation, it still needs to increase the size of the antenna to achieve the opportunity. In the case of limited space, the number or size of the antenna is increased in order to increase the speed, and Furthermore, it is necessary to prevent the antennas from interfering with each other, which is difficult.

This application provides a dual-antenna system, including a dielectric substrate, a grounding portion, a common radiating portion, a first feeding branch, a second feeding branch, a first feeding source, and a second feeding source , a first parasitic branch and a second parasitic branch. The dielectric substrate includes an opposite first long side and a second long side. The grounding portion is located on the dielectric substrate and is adjacent to the first long side. The common radiation part is located on the dielectric substrate and is adjacent to the second long side. The first feed-in branch is located on the dielectric substrate, and the first feed-in branch is connected to the common radiation part and extends toward the ground part. The second feed-in branch is located on the dielectric substrate and corresponds to the first feed-in branch. The second feed-in branch is connected to the common radiating part and extends toward the grounding part. The common radiating part, the first feeding branch, and the grounding part There is a matching slot between the second feeding branch and the second feeding branch. The first feeding source is located on the dielectric substrate and is electrically connected to the first feeding branch and the grounding part. The second feeding source is located on the dielectric substrate and is electrically connected to the second feeding branch and the grounding portion. The first parasitic branch is located on the dielectric substrate and is located outside the first feeding branch, the first parasitic branch is connected to the ground part and extends toward the direction of the common radiation part, so that the first parasitic branch is separated from the first feeding branch a first coupling distance. The second parasitic branch is located on the dielectric substrate and is located outside the second feeding branch. The second parasitic branch is connected to the ground part and extends toward the common radiation part, so that the second parasitic branch is separated from the second feeding branch a second coupling distance.

To sum up, this case is a dual-antenna system design that is downsized and has low coupling characteristics at the same time. It uses a common radiating part to effectively save the size of the antenna, and adds two feeding sources in a single structure, and then uses The design of common mode and differential mode solves the problem of isolation, and by adding parasitic branch design, it can increase the available bandwidth of isolation while increasing the bandwidth. Therefore, this case can effectively support dual-mode resonance operation, and its resonance frequency band is 3.3 to 6 GHz, which can cover the operating frequency band (3.3 to 5 GHz) required by the new generation of communication systems N77, N78, and N79. Therefore, this case can solve the problem of isolation between the two antennas without increasing the system space of the product, and at the same time improve the coverage and quality of wireless communication.

Please refer to FIG. 1 , the dual antenna system 10 of the present application includes a dielectric substrate 12 , a grounding portion 14 , a common radiating portion 16 , a first feeding branch 18 , a second feeding branch 20 , a A first feeding source 22 , a second feeding source 24 , a first parasitic branch 26 and a second parasitic branch 28 .

As shown in FIG. 1 , in the dual antenna system 10 , the dielectric substrate 12 includes a first long side 121 and a second long side 122 and a first short side 123 and a second opposite The short side 124, the first short side 123 is connected to the same side of the first long side 121 and the second long side 122, and the second short side 124 is connected to the first long side 121 and the second long side 122 on the other side. The grounding portion 14 is located on the dielectric substrate 12 and is adjacent to the first long side 121 so as to be disposed along the first long side 121 . The common radiation portion 16 is located on the dielectric substrate 12 and is adjacent to the second long side 122. In this embodiment, the common radiation portion 16 extends to the second long side 122, the first short side 123 and the second short side Side 124. The first feeding branch 18 is located on the dielectric substrate 12 , one end of the first feeding branch 18 is connected to the common radiation part 16 , and the other end extends toward the grounding part 14 ; the second feeding branch 20 is located on the dielectric substrate 12 And corresponding to the first feeding branch 18 , one end of the second feeding branch 20 is connected to the common radiating part 16 , and the other end extends toward the grounding part 14 , wherein the common radiating part 16 , the first feeding branch 18 , There is a matching slot 30 between the grounding portion 14 and the second feeding branch 20 , so that the length of the matching slot 30 can be used to adjust a distance between the first feeding branch 18 and the second feeding branch 20 . distance. The first feeding source 22 is located on the dielectric substrate 12 and is electrically connected to the first feeding branch 18 and the grounding portion 14 , and the second feeding source 24 is located on the dielectric substrate 12 and is electrically connected to the second feeding branch The circuit 20 and the grounding portion 14 are used to transmit and receive radio frequency signals by using the first feeding source 22 and the second feeding source 24 . The first parasitic branch 26 is located on the dielectric substrate 12 and is located outside the first feeding branch 18 , one end of the first parasitic branch 26 is connected to the grounding portion 14 , the other end extends toward the direction of the common radiating portion 16 , and then The bend extends away from the first feeding branch 18 (extends in the direction of the first short side 123 ), so that the first parasitic branch 26 is separated from the first feeding branch 18 by a first coupling distance D1 . The second parasitic branch 28 is located on the dielectric substrate 12 and outside the second feeding branch 20 . One end of the second parasitic branch 28 is connected to the grounding portion 14 , the other end extends toward the common radiating portion 16 , and then The bend extends in the direction away from the second feed-in branch 20 (extends in the direction of the second short side 124 ), so that the second parasitic branch 28 is separated from the second feed-in branch 20 by a second coupling distance D2 . Therefore, in this case, the design of the first parasitic branch 26 and the second parasitic branch 28 is used to increase the bandwidth.

As shown in FIG. 1 , the outer side of the first long side 121 of the dielectric substrate 12 of the dual antenna system 10 is further provided with a system ground plane 32, so that the ground portion 14 is electrically connected to the system ground plane 32, and the first parasitic branch The path 26 and the second parasitic branch 28 may also be connected to the system ground plane 32 at the same time. Of course, in another embodiment, the first parasitic branch 26 and the second parasitic branch 28 can also be only electrically connected to the grounding portion 14 , and then electrically connected to the system ground plane 32 through the grounding portion 14 . In one embodiment, the system ground plane 32 may be an independent metal sheet, or may be located on a metal plane of an electronic device. Metal sheet or sputtered metal part, but not limited to this case. For example, when the electronic device is a notebook computer, the system ground plane 32 may be a system ground plane of a notebook computer screen or a metal part such as an EMI aluminum foil or a sputtered metal area in the notebook computer screen casing. The shape and size of the system ground plane 32 drawn in the drawings are for illustration only, and the shape or size of the system ground plane 32 can be changed with the application of the dual antenna system 10 , but not limited thereto.

In another embodiment, as shown in FIG. 2 , the common radiating portion 16 is located on the dielectric substrate 12 and is adjacent to the second long side 122 , and the common radiating portion 16 does not need to extend to the second long side 122 and the second long side 122 . The edges of one short side 123 and the second short side 124, since the length of the common radiating portion 16 can be used to adjust the resonant frequency, and the width can be used to adjust the antenna matching, so as long as the common radiating portion 16 has sufficient length and width , the common radiating portion 16 can be spaced apart from the second long side 122 , the first short side 123 and the second short side 124 respectively.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the length of the first parasitic branch 26 is the length of 0.25 times the wavelength of the operating frequency. Similarly, the length of the second parasitic branch 28 is the length of 0.25 times the wavelength of the operating frequency.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the common radiating part 16 , the first feeding branch 18 , the second feeding branch 20 , the first parasitic branch 26 , the second parasitic branch 28 , Elements such as the grounding portion 14 are made of conductive metal materials, such as silver, copper, aluminum, iron or alloys thereof, but the present application is not limited thereto.

As shown in FIGS. 1 and 2 , the dual-antenna system 10 of the present application supports dual-mode resonance operation. The first feeding source 22 , the first feeding branch 18 , the common radiating part 16 and the first parasitic branch 26 are used as a first antenna 34 , and the second feeding source 24 and the second feeding branch are used as a first antenna 34 . 20. The common radiating portion 16 and the second parasitic branch 28 are used as a second antenna 36 . The structures of the first antenna 34 and the second antenna 36 substantially mirror each other and are located on one side of the dielectric substrate 12 respectively, and support dual-mode resonance operation.

Please refer to FIG. 1 and FIG. 3 at the same time, in the first antenna 34, the first feeding source 22, the first feeding branch 18, and the common radiating portion 16 can generate a first resonance mode, and the current path is as follows: As shown in FIG. 4, the first feed source 22 is excited at an operating frequency of 3.4 GHz to form a resonance mode with a resonance path of about 0.25 wavelengths. Since there is a first coupling distance D1 between the first parasitic branch 26 and the first feeding branch 18 , the first feeding branch 18 , the common radiating part 16 , the first parasitic branch 26 , the system ground plane 32 and the ground The portion 14 forms a first coupled loop structure to generate a second resonant mode, the current path of which is shown in FIG. 5 , and the first feed source 22 is excited at an operating frequency of 5.5 GHz to form a resonant path of about 0.5 wavelength-doubling resonance modes. Therefore, through the combination of the first resonance mode and the second resonance mode, the first antenna 34 can achieve a wide-band operating frequency band, and its frequency band range covers 3.3 GHz to 6 GHz, which is in line with the N77, N78, Operating frequency band of N79 (3.3 GHz ~ 5 GHz).

Please refer to FIG. 1 and FIG. 3 at the same time. In the second antenna 36, the second feeding source 24, the second feeding branch 20, and the common radiating portion 16 can generate a third resonance mode. The input source 24 is excited at the operating frequency of 3.4 GHz, and forms a resonance mode with a resonance path of about 0.25 wavelengths (0.25λ). On the other hand, since there is a second coupling distance D2 between the second parasitic branch 28 and the second feeding branch 20, the second feeding branch 20, the common radiating part 16, the second parasitic branch 28, the system connection The ground 32 and the ground portion 14 will form a second coupled loop structure to generate a fourth resonance mode. When the second feed source 24 is excited at the operating frequency of 5.5 GHz, a resonance path will be formed about 0.5 times the wavelength ( 0.5λ) resonance mode. Therefore, the second antenna 36 can also achieve a broadband operating frequency band through the combination of the third resonance mode and the fourth resonance mode, and its frequency band covers 3.3 GHz to 6 GHz, which is in line with the N77 and N78 of the new generation of mobile communications. , N79 operating frequency band (3.3 GHz ~ 5 GHz).

Furthermore, since the first antenna 34 and the second antenna 36 share the same common radiating portion 16, the first feeding branch 18, the common radiating portion 16, the second feeding branch 20 and the The matching slot 30 formed by the grounding portion 14 is used to adjust the matching and isolation. Wherein, the length of the matching slot 30 can adjust the distance between the first feeding branch 18 and the second feeding branch 20 (that is, the distance between the first feeding source 22 and the second feeding source 24 ), Further, the common mode (inputs of the first feeding source 22 and the second feeding source 24 are in phase) and the differential mode (the first feeding source 22 and the second feeding source 24 are in phase) and the differential mode (the first feeding source 22 and the second feeding source 24 are in phase) can be controlled between the first antenna 34 and the second antenna 36 . The current phase of the input source 24 is adjusted to improve the isolation, so as to obtain a better isolation; the width of the matching slot 30 can adjust the matching of the antenna, and the grounding part 14 can also be adjusted by adjusting the height. The matching of the antennas, and the first coupled loop structure of the first antenna 34 and the second coupled loop structure of the second antenna 36 can also be adjusted in the same way to improve the isolation. Therefore, in this case, the first antenna 34 and the second antenna 36 can share the same common radiating portion 16 to effectively save the antenna size and space, and achieve good isolation.

The dual antenna system 10 proposed in this case does have good reflection coefficient and isolation. Please refer to FIG. 1 and FIG. 3 at the same time. In the dual-antenna system 10, the size of the entire dual-antenna system 10 is 38 mm*7.5 mm, so that the dual-antenna system 10 performs S-parameter measurement during RF signal transmission. Simulation analysis. The S-parameter simulation results of the dual-antenna system 10 in the low-frequency operating frequency band and the high-frequency operating frequency band respectively are shown in FIG. The reflection coefficients (S11) of the resonance modes are all less than -10 dB (S11 <-10 dB), and the reflection coefficients (S22) of the third resonance mode and the fourth resonance mode are also less than -10 dB (S11 <-10 dB), which proves that it has a good reflection coefficient in both the low frequency operating band and the high frequency operating band. On the other hand, the isolation curve (S21) at the bottom of the diagram shows that the antenna isolation can reach -11 dB in the operating frequency band (S21 <-11 dB), which proves that both the low frequency operating frequency band and the high frequency operating frequency band have good isolation. Therefore, the dual antenna system 10 of the present application has good isolation in the operating frequency band of the same frequency dual feed.

To sum up, this case is a dual-antenna system design that is downsized and has low coupling characteristics at the same time. It uses a common radiating part to effectively save the size of the antenna, and adds two feeding sources in a single structure, and then uses The design of common mode and differential mode solves the problem of isolation, and by adding parasitic branch design, it can increase the available bandwidth of isolation while increasing the bandwidth. Therefore, this case can effectively support dual-mode resonance operation, and its resonance frequency band is 3.3-6 GHz, which can cover the new generation communication systems N77 (3.3-4.2 GHz), N78 (3.3-3.8 GHz), N79 (4.4-5 GHz) ) required operating frequency band (3.3 to 5 GHz). Therefore, this case can solve the problem of isolation between the two antennas without increasing the system space of the product, and at the same time improve the coverage and quality of wireless communication.

The above-mentioned embodiments are only intended to illustrate the technical ideas and features of this case, and their purpose is to enable those familiar with the art to understand the content of this case and implement them accordingly. Equivalent changes or modifications made to the disclosed spirit shall still be covered within the scope of the patent application in this case.

10: Dual Antenna System 12: Dielectric substrate 121: The first long side 122: The second longest side 123: The first short side 124: Second Short Side 14: Grounding 16: Shared Radiation Department 18: First feed branch 20: Second feed branch 22: First feed source 24: Second feed source 26: The first parasitic branch 28: Second parasitic branch 30: Matching slotted holes 32: System ground plane 34: The first antenna 36: Second Antenna D1: The first coupling distance D2: Second coupling pitch

FIG. 1 is a schematic structural diagram of a dual-antenna system according to an embodiment of the present invention. FIG. 2 is a schematic structural diagram of a dual-antenna system according to another embodiment of the present application. FIG. 3 is a schematic diagram of S-parameter simulation generated by the dual-antenna system of the present application. FIG. 4 is a current path distribution diagram of the first feed source excited at 3.4 GHz of the dual antenna system according to an embodiment of the present application. FIG. 5 is a current path distribution diagram of the first feed source excited at 5.5 GHz of the dual antenna system according to an embodiment of the present application.

10: Dual Antenna System

12: Dielectric substrate

121: The first long side

122: The second longest side

123: The first short side

124: Second Short Side

14: Grounding

16: Shared Radiation Department

18: First feed branch

20: Second feed branch

22: First feed source

24: Second feed source

26: The first parasitic branch

28: Second parasitic branch

30: Matching slotted holes

32: System ground plane

34: The first antenna

36: Second Antenna

D1: The first coupling distance

D2: Second coupling pitch

Claims (12)

A dual antenna system comprising: a dielectric substrate including a first long side and a second long side opposite to each other; a grounding portion located on the dielectric substrate and adjacent to the first long side; a common radiation portion located on the dielectric substrate and adjacent to the second long side; a first feed-in branch, located on the dielectric substrate, the first feed-in branch is connected to the common radiation part and extends toward the ground part; a second feed-in branch, located on the dielectric substrate and corresponding to the first feed-in branch, the second feed-in branch is connected to the common radiating part and extends toward the ground part, the common radiating part, the A matching slot is formed between the first feed-in branch, the ground portion and the second feed-in branch; a first feed-in source located on the dielectric substrate and electrically connected to the first feed-in branch and the ground portion; a second feed-in source located on the dielectric substrate and electrically connected to the second feed-in branch and the ground portion; a first parasitic branch, located on the dielectric substrate and outside the first feeding branch, the first parasitic branch is connected to the grounding part and extends toward the common radiation part, so that the first parasitic branch is spaced apart from the first feeding branch by a first coupling distance; and A second parasitic branch is located on the dielectric substrate and is located outside the second feeding branch, the second parasitic branch is connected to the ground part and extends toward the common radiation part, so that the second parasitic branch is A second coupling distance is separated from the second feeding branch. The dual-antenna system of claim 1, wherein the dielectric substrate further comprises a first short side and a second short side, the common radiating portion extends to the second long side, the first short side the short side and the second short side. The dual-antenna system of claim 1, wherein the first parasitic branch is more bent and extends in a direction away from the first feeding branch. The dual-antenna system of claim 1, wherein the second parasitic branch is more bent and extends in a direction away from the second feeding branch. The dual-antenna system of claim 1, wherein the first feeding source, the first feeding branch, the common radiating portion and the first parasitic branch serve as a first antenna. The dual-antenna system of claim 1, wherein the second feeding source, the second feeding branch, the common radiating portion and the second parasitic branch serve as a second antenna. The dual-antenna system of claim 1, wherein the length of the first parasitic branch is a length of 0.25 times the wavelength of the operating frequency. The dual antenna system of claim 1, wherein the length of the second parasitic branch is a length of 0.25 times the wavelength of the operating frequency. The dual-antenna system of claim 1 further includes a system ground plane located on the first long side of the dielectric substrate and connected to the ground portion. The dual antenna system of claim 9, wherein the first parasitic branch and the second parasitic branch are connected to the system ground plane. The dual antenna system of claim 10, wherein the first feeding branch, the common radiating portion, the first parasitic branch, the system ground plane and the ground portion form a first coupled loop structure . The dual antenna system of claim 10, wherein the second feeding branch, the common radiating portion, the second parasitic branch, the system ground plane and the ground portion form a second coupled loop structure .

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