TWM666370U - Multi-band dual antenna system - Google Patents

Abstract

The invention discloses a multi-frequency dual antenna system, comprising a dielectric substrate and a first antenna unit, a second antenna unit, a first interdigitated electrode portion and a second interdigitated electrode portion thereon. The first antenna unit comprises a first radiation portion, a third radiation portion, a first signal source and a ground portion, and the second antenna unit comprises a second radiation portion, a fourth radiation portion, a second signal source and a ground portion. The first interdigitated electrode portion and the second interdigitated electrode portion are located on the dielectric substrate and between the first radiation portion and the second radiation portion. One end of the first interdigitated electrode portion is connected to the first radiation portion and the second radiation portion, and one end of the second interdigitated electrode portion is connected to the ground portion. The first interdigitated electrode portion and the second interdigitated electrode portion are interlaced with each other to provide good isolation by the first interdigitated electrode portion and the second interdigitated electrode portion.

Description

Multi-band dual antenna system

This case is about a multi-band dual antenna system that has both compact size and low coupling characteristics.

In the dual-antenna design of a general laptop, the area size of a single antenna unit in the dual-antenna system is usually 8 mm*40 mm or 10 mm*30 mm, and the distance between the two antenna units is usually maintained at more than 0.5 times the wavelength of the antenna's lowest operating frequency. Taking Wi-Fi 7 as an example, the distance between the two antenna units is required to be 0.5 times the wavelength of the low-frequency 2.4 GHz, which is about 62.5 mm, to ensure good isolation between the antenna units. Therefore, the distance between the two antennas cannot be designed to be very close, resulting in a lack of good spatial integration.

If a dual antenna needs to be designed in the space of a traditional single antenna, the two antenna units need to share the antenna structure. In order to increase the isolation between the two antenna units, a decoupling element will be added between the antenna units to achieve the purpose of reducing the usage area while taking into account the performance. However, adding decoupling elements will lead to increased costs and increase the risks of assembly and transportation, which is not conducive to the mass production of dual antenna designs.

The invention provides a multi-frequency dual antenna system, comprising a dielectric substrate, a grounding portion, a first radiation portion, a second radiation portion, a first interdigitated electrode portion, a second interdigitated electrode portion, a third radiation portion, a fourth radiation portion, a first signal source and a second signal source. The dielectric substrate has a first long side and a second long side opposite to each other and a first short side and a second short side opposite to each other. The grounding portion is disposed on the dielectric substrate and along the first long side. The first radiation portion is disposed on the dielectric substrate and along the second long side. The first radiation portion has a first end and a second end. The first end is disposed on the second long side. The second end first bends to extend in the direction of the first long side and then bends again to continue to extend in the direction of the second short side to connect to the ground portion. The second radiation portion is disposed on the dielectric substrate and along the second long side. The second radiation portion has a third end and a fourth end. The third end is disposed on the second long side. The fourth end first bends to extend in the direction of the first long side and then bends again to continue to extend in the direction of the first short side to connect to the ground portion. The first interdigitated electrode portion is disposed on the dielectric substrate and between the first radiation portion and the second radiation portion. One end of the first interdigitated electrode portion is connected to the first end and the third end. The second interdigitated electrode portion is disposed on the dielectric substrate and between the first radiation portion and the second radiation portion, the second interdigitated electrode portion is interlaced with the first interdigitated electrode portion, and one end of the second interdigitated electrode portion is connected to the ground portion. The third radiation portion is disposed on the dielectric substrate and along the first short side. The fourth radiation portion is disposed on the dielectric substrate and along the second short side. The first signal source is connected to the third radiation portion and the ground portion. The second signal source is connected to the fourth radiation portion and the ground portion.

In summary, this case is a multi-band dual antenna system design, which uses a multi-bend and coupling design. The multi-bend fold loop design can make the antenna obtain a wider bandwidth, and the interdigitated electrode part is used as the isolation part to reduce the coupling between the dual antennas, so that the multi-band dual antenna system has good isolation to improve the antenna performance. Therefore, the multi-band dual antenna system of this case not only does not increase the product system space, but also can reduce the antenna manufacturing cost and the risk of assembly and transportation, solve the coupling problem between the dual antennas, and support a wider frequency band range, so as to simultaneously improve the coverage and quality of wireless communications.

The following will be used in conjunction with the relevant drawings to illustrate the embodiments of the present invention. In addition, the drawings in the embodiments omit some components or structures to clearly show the technical features of the present invention. In these drawings, the same reference numerals represent the same or similar components or circuits. It must be understood that although the terms "first", "second", etc. may be used in this article to describe various components, parts, regions or functions, these components, parts, regions and/or functions should not be limited by these terms. These terms are only used to separate one component, component, region or function from another component, component, region or function.

1 , the multi-band dual antenna system 10 of the present invention includes a dielectric substrate 12, a ground portion 14, a first radiation portion 16, a second radiation portion 18, a first interdigitated electrode portion 20, a second interdigitated electrode portion 22, a third radiation portion 24, a fourth radiation portion 26, a first signal source 28, a second signal source 30, and an antenna ground plane 36.

As shown in FIG1 , in the multi-band 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 short side 124. The first short side 123 connects the same side of the first long side 121 and the second long side 122, and the second short side 124 connects the other same side of the first long side 121 and the second long side 122. In one embodiment, the dielectric substrate 12 can be a hard board (such as FR4), a soft board (such as FPCB) or a three-dimensional substrate (such as LDS). The grounding portion 14 is located on the dielectric substrate 12 and is arranged along the first long side 121. The first radiating portion 16 is located on the dielectric substrate 12 and is disposed along the second long side 122. The first radiating portion 16 has a first end 161 and a second end 162. The first end 161 is located in the middle of the second long side 122. The second end 162 first bends to extend toward the first long side 121 and then bends to continue to extend toward the second short side 124, so that the second end 162 is connected to the ground portion 14. A first continuous bending section 163 is further provided on the segment of the first radiating portion 16 extending toward the second short side 124 to ensure that the first radiating portion 16 has a sufficient antenna length. The second radiating portion 18 is located on the dielectric substrate 12 and is arranged along the second long side 122 and corresponds to the first radiating portion 16. The second radiating portion 18 has a third end 181 and a fourth end 182. The third end 181 is located in the middle of the second long side 122 and is connected to the first end 161 of the first radiating portion 16. The fourth end 182 first bends to extend toward the first long side 121 and then bends to continue to extend toward the first short side 123, so that the fourth end 182 is connected to the ground portion 14. A second continuous bending section 183 is further provided on the segment of the second radiating portion 18 extending toward the first short side 123 to ensure that the second radiating portion 18 has a sufficient antenna length.

The first interdigitated electrode portion 20 is located on the dielectric substrate 12 and between the first radiation portion 16 and the second radiation portion 18 . One end of the first interdigitated electrode portion 20 is connected to the first end 161 and the third end 181 . The plurality of first interdigitated electrodes 201 of the first interdigitated electrode portion 20 face the first long side 121 . The second interdigitated electrode portion 22 is located on the dielectric substrate 12 and between the first radiation portion 16 and the second radiation portion 18. One end of the second interdigitated electrode portion 22 is connected to the ground portion 14. The second interdigitated electrodes 221 of the second interdigitated electrode portion 22 face the second long side 122, so that the second interdigitated electrodes 221 of the second interdigitated electrode portion 22 and the first interdigitated electrodes 201 of the first interdigitated electrode portion 20 are interdigitated with each other. There is no contact, so that the first interdigitated electrode portion 20 and the second interdigitated electrode portion 22 are used to form an isolation portion. In this case, the first interdigitated electrode portion 20 and the second interdigitated electrode portion 22 are used as the isolation portion, which can greatly reduce the used space, and the number of interdigitated electrodes of the first interdigitated electrode 201 and the second interdigitated electrode 221 can be increased or decreased according to the antenna design to adjust the coupling amount between the first interdigitated electrode portion 20 and the second interdigitated electrode portion 22. The third radiation portion 24 is located on the medium substrate 12 and is arranged along the first short side 123, wherein the third radiation portion 24 has a fifth end 241 and a sixth end 242, wherein the fifth end 241 is connected to the first signal source 28, and the sixth end 242 first extends toward the second short side 124, bends to extend toward the second long side 122, and then bends to continue to extend toward the first short side 123, so that the third radiation portion 24 has a secondary bend, but the present case is not limited to this. The fourth radiation portion 26 is located on the medium substrate 12 and is arranged along the second short side 124, wherein the fourth radiation portion 26 has a seventh end 261 and an eighth end 262, the seventh end 261 is connected to the second signal source 30, and the eighth end 262 first extends toward the first short side 123, bends to extend toward the second long side 122, and then bends and continues to extend toward the second short side 124, so that the fourth radiation portion 26 has a secondary bend, but the present case is not limited to this. The two ends of the first signal source 28 are connected to the fifth end 241 of the third radiating portion 24 and the ground portion 14, respectively. The two ends of the second signal source 30 are connected to the seventh end 261 of the fourth radiating portion 26 and the ground portion 14, respectively, so as to utilize the first signal source 28 and the second signal source 30 to transmit and receive wireless radio frequency signals. The antenna ground plane 36 is adjacent to the first long side 121 of the dielectric substrate 12, so that the ground portion 14 is connected to the antenna ground plane 36 to form an electrical connection. In one embodiment, the antenna ground plane 36 is a conductive material, such as copper foil, aluminum foil or conductive cloth.

In one embodiment, as shown in FIG. 1 , the multi-band dual antenna system 10 includes a first antenna unit 32 and a second antenna unit 34, and both the first antenna unit 32 and the second antenna unit 34 support multi-band operations. In addition to supporting the operating frequency bands of 2400-2484 MHz and 5150-5850 MHz of traditional Wi-Fi, they can also meet the operating frequency band of 5925-7125 MHz of Wi-Fi 7. The first antenna unit 32 includes the first radiation part 16, the third radiation part 24, the first signal source 28 and the ground part 14 in the left half, and the second antenna unit 34 includes the second radiation part 18, the fourth radiation part 26, the second signal source 30 and the ground part 14 in the right half, so that the first interdigitated electrode part 20 and the second interdigitated electrode part 22 are located between the first antenna unit 32 and the second antenna unit 34 and serve as an isolation part to effectively isolate the first antenna unit 32 and the second antenna unit 34 and reduce the coupling between the first antenna unit 32 and the second antenna unit 34. The first antenna unit 32 is mirror-symmetrical to the second antenna unit 34 , so that the first antenna unit 32 and the second antenna unit 34 present a symmetrical mirror design on the left and right sides of the first interdigitated electrode portion 20 and the second interdigitated electrode portion 22 .

In one embodiment, please refer to FIG. 1 and FIG. 2 , a system ground plane 38 is further provided around the antenna ground plane 36 of the multi-band dual antenna system 10, so that the antenna ground plane 36 is directly connected to the system ground plane 38 and forms an electrical connection to ensure that the multi-band dual antenna system 10 is grounded to the surrounding system ground plane 38, thereby improving stability. In one embodiment, the system ground plane 38 can be a metal plane of an electronic device, for example, the system ground plane 38 can be a metal frame of the electronic device or a metal sheet or a sputtered metal part inside the housing of the electronic device, but the present invention is not limited thereto.

Please refer to Figure 3, the first radiation portion 16 is located on the medium substrate 12 and is arranged along the second long side 122. The first radiation portion 16 has a first end 161 and a second end 162. The first end 161 is located in the middle of the second long side 122, and the second end 162 first bends to extend toward the first long side 121 and then bends to continue to extend toward the second short side 124, so that the second end 162 is connected to the ground portion 14. Among them, a first continuous bending section 163 is further provided on the segment of the first radiation portion 16 arranged along the second long side 122. The second radiation portion 18 is located on the dielectric substrate 12 and is arranged along the second long side 122 and corresponds to the first radiation portion 16. The second radiation portion 18 has a third end 181 and a fourth end 182. The third end 181 is located in the middle of the second long side 122 and is connected to the first end 161 of the first radiation portion 16. The fourth end 182 first bends to extend toward the first long side 121 and then bends to continue to extend toward the first short side 123, so that the fourth end 182 is connected to the ground portion 14. A second continuous bending section 183 is further provided on the segment of the second radiation portion 18 arranged along the second long side 122. The third radiation portion 24 has a fifth end 241 and a sixth end 242. The fifth end 241 is connected to the first signal source 28. The sixth end 242 first extends toward the second long side 122, and then continuously bends in the inner direction (the direction of the first radiation portion 16) and extends toward the first long side 121, so that the third radiation portion 24 has a secondary bend, but the present invention is not limited thereto. The fourth radiation portion 26 has a seventh end 261 and an eighth end 262. The seventh end 261 is connected to the second signal source 30. The eighth end 262 first extends toward the second long side 122, and then continuously bends in the inner direction (the direction of the second radiation portion 18) and extends toward the first long side 121, so that the fourth radiation portion 26 has a secondary bend, but the present invention is not limited thereto. The remaining structures are the same as those of the embodiments shown in FIG. 1 and FIG. 2 , so please refer to the aforementioned description and will not be described again here.

In one embodiment, referring to FIG. 1 and FIG. 3 , in the multi-band dual antenna system 10, the first radiating portion 16, the second radiating portion 18, the third radiating portion 24, and the fourth radiating portion 26 may have a vertically bent structure (pattern) design and may also have other different shapes of structure designs as long as the radiation length is sufficient.

In one embodiment, as shown in FIG. 1 and FIG. 3 , the ground portion 14, the first radiation portion 16, the second radiation portion 18, the first interdigitated electrode portion 20, the second interdigitated electrode portion 22, the third radiation portion 24, and the fourth radiation portion 26 are made of conductive metal materials, such as silver, copper, aluminum, iron, or alloys thereof, but the present invention is not limited thereto.

Please refer to FIG. 1 and FIG. 4 . In the first antenna unit 32 of the multi-band dual antenna system 10, when operating in the low-band, the first signal source 28 feeds an RF signal to the third radiating portion 24. The third radiating portion 24 then couples the signal to the first radiating portion 16, so that the first radiating portion 16, the ground portion 14 and the antenna ground plane 36 are excited to resonate a loop current of 1 times the wavelength. This loop current mainly excites a first operating mode, whose center frequency is about 2.45 GHz. By changing the length and width of the first radiating portion 16 or the distance between the third radiating portion 24 and the first radiating portion 16, the frequency and matching of the first operating mode can be adjusted. In high-band operation, the third radiation portion 24 mainly excites a second operating mode and a third operating mode. The center frequency of the second operating mode is approximately 6.15 GHz, and the center frequency of the third operating mode is approximately 6.68 GHz. The two modes can be combined into one bandwidth to achieve broadband characteristics, and by changing the length and width of the third radiation portion 24, the frequency and matching of the second operating mode and the third operating mode can be adjusted. In the second antenna unit 34 of the multi-band dual antenna system 10, when operating in the low-band, the second signal source 30 feeds an RF signal to the fourth radiation portion 26, and the fourth radiation portion 26 couples the signal to the second radiation portion 18, so that the second radiation portion 18, the ground portion 14 and the antenna ground surface 36 are excited to resonate a loop current of 1 times the wavelength. This loop current mainly excites a fourth operating mode, whose center frequency is about 2.45 GHz. By changing the length and width of the second radiation portion 18 or the distance between the fourth radiation portion 26 and the second radiation portion 18, the frequency and matching of the fourth operating mode can be adjusted. In high-band operation, the fourth radiating portion 26 mainly excites a fifth operating mode and a sixth operating mode. The center frequency of the fifth operating mode is about 6.15 GHz, and the center frequency of the sixth operating mode is about 6.68 GHz. The two modes can be combined into one bandwidth to achieve broadband characteristics, and the frequency and matching of the fifth operating mode and the sixth operating mode can be adjusted by changing the length and width of the fourth radiating portion 26. Therefore, combining the above six operating modes (the first operating mode to the sixth operating mode), the operating bandwidth of the multi-band dual antenna system 10 can meet the multi-band operation of Wi-Fi 7 (2.4/5/6 GHz, i.e., 2400-2484/5150-5825/5925-7125 MHz).

The multi-band dual antenna system 10 of the present invention is applicable to general wireless communication devices, especially portable wireless communication devices, such as laptop computers, tablet computers or all-in-one personal computers, but the application of the present invention is not limited thereto. The multi-band dual antenna system 10 on the dielectric substrate 12 has a length of 38 mm and a width of 8 mm, which is actually a small-sized multi-band dual antenna system 10 structure design.

The multi-band dual antenna system 10 proposed in this case does have good reflection coefficient and isolation. Please refer to FIG. 1 and FIG. 4 at the same time. In this multi-band dual antenna system 10, the size of the entire multi-band dual antenna system 10 is 38 mm * 8 mm. When the multi-band dual antenna system 10 is used to transmit RF signals, S parameters (including reflection coefficient curve S ₁₁ /S ₂₂ and penetration coefficient curve S ₂₁ ) are simulated and analyzed. When the multi-band dual antenna system 10 is in the low frequency operating band and the high frequency operating band, the S parameter simulation results are shown in FIG. 4 . It can be seen from the reflection coefficient curves (S ₁₁ , S ₂₂ ) shown in FIG. 4 that the reflection coefficient curves (S ₁₁ , S ₂₂ ) of the first operating mode to the sixth operating mode are all less than -6 dB (S ₁₁ , S ₂₂ ＜-6 dB), and the reflection coefficient curves (S ₁₁ , S ₂₂ ) of the first operating mode and the fourth operating mode are less than -10 dB (S ₁₁ , S ₂₂ ＜-10 dB), and the bandwidth can reach 150 MHz, which proves that it has good impedance matching in both low-frequency operating band and high-frequency operating band, and can meet the WiFi multi-band of 2400-2484 MHz, 5150-5850 MHz and 5925-7125 MHz. Furthermore, from the penetration coefficient curve (S ₂₁ ) shown in FIG4 , it can be seen that the penetration coefficient curve (S ₂₁ ) is less than -16 dB (S ₂₁ ＜-16 dB) in the low-frequency band, which means that the isolation is higher than 16 dB, so it can be proved that the multi-band dual antenna system 10 has a good antenna decoupling effect.

Therefore, the multi-band dual antenna system proposed in this case is different from the traditional method of increasing the distance between the two antenna units to increase the antenna isolation, or adding a resonance structure of a specific wavelength between the two antenna units, or using lumped elements to achieve decoupling and size reduction, or using a double-panel coupling design to achieve decoupling and size reduction. This case only uses a simple single-sided antenna design, and can adjust the decoupling frequency through the coupling area of the first interdigitated electrode part and the second interdigitated electrode part as the isolation part, so as to effectively reduce the size of the antenna and significantly reduce the antenna cost and transportation risk.

In summary, this case is a multi-band dual antenna system design, which uses a multi-bend and coupling design. The multi-bend fold loop design can make the antenna obtain a wider bandwidth, and the interdigitated electrode part is used as the isolation part to reduce the coupling between the dual antennas, so that the multi-band dual antenna system has good isolation to improve the antenna performance. In addition to being applicable to the 2400-2484 MHz and 5150-5850 MHz frequency bands, this case can also meet the Wi-Fi 7 frequency band (5925-7125 MHz). Therefore, the multi-band dual-antenna system in this case not only does not increase the product system space, but also can reduce the antenna manufacturing cost and the risk of assembly and transportation, solve the coupling problem between the dual antennas, and support a wider frequency band range to simultaneously improve the coverage and quality of wireless communications.

The implementation examples described above are only for illustrating the technical ideas and features of this case. Their purpose is to enable those familiar with this technology to understand the content of this case and implement it accordingly. They cannot be used to limit the patent scope of this case. In other words, any equivalent changes or modifications made according to the spirit disclosed in this case should still be covered by the scope of the patent application of this case.

10: Multi-band dual antenna system 12: Dielectric substrate 121: First long side 122: Second long side 123: First short side 124: Second short side 14: Grounding portion 16: First radiation portion 161: First end 162: Second end 163: First continuous bending section 18: Second radiation portion 181: Third end 182: Fourth end 183: Second continuous bending section 20: First interdigitated electrode portion 201: First interdigitated electrode portion 22: Second interdigitated electrode portion 221: Second interdigitated electrode portion 24: Third radiation portion 241: Fifth end 242: Sixth end 26: Fourth radiating part 261: Seventh terminal 262: Eighth terminal 28: First signal source 30: Second signal source 32: First antenna unit 34: Second antenna unit 36: Antenna ground plane 38: System ground plane

FIG1 is a schematic diagram of the structure of a multi-frequency dual antenna system according to an embodiment of the present invention. FIG2 is a schematic diagram of the structure of a multi-frequency dual antenna system connected to a system ground plane according to an embodiment of the present invention. FIG3 is a schematic diagram of the structure of a multi-frequency dual antenna system according to another embodiment of the present invention. FIG4 is a schematic diagram of the simulation of the reflection coefficient curve ( _S11 and _S22 parameters) and the penetration coefficient curve ( _S21 parameter) generated by the multi-frequency dual antenna system according to the present invention.

10: Multi-frequency dual antenna system

12: Dielectric substrate

121: First long side

122: Second longest side

123: First short side

124: Second short side

14: Grounding part

16: First Radiation Division

161: First end

162: The second end

163: The first continuous bending segment

18: Second Radiation Division

181: The third end

182: The fourth end

183: Second continuous bending segment

20: First interdigitated electrode part

201: First interdigitated electrode

22: Second interdigitated electrode part

221: Second interdigitated electrode

24: The Third Radiation Division

241: The Fifth End

242: The Sixth End

26: The Fourth Radiation Division

261: The Seventh End

262: The Eighth End

28: First signal source

30: Second signal source

32: First antenna unit

34: Second antenna unit

36: Antenna ground plane

Claims (11)

A multi-band dual antenna system, comprising: a dielectric substrate, which has a first long side and a second long side opposite to each other and a first short side and a second short side opposite to each other; a grounding portion, located on the dielectric substrate and arranged along the first long side; a first radiating portion, located on the dielectric substrate and arranged along the second long side, the first radiating portion having a first end and a second end, the first end being located on the second long side, the second end first being bent to extend in the direction of the first long side and then being bent again to continue to extend in the direction of the second short side to connect to the grounding portion; A second radiating portion, located on the dielectric substrate and disposed along the second long side, the second radiating portion having a third end and a fourth end, the third end being located on the second long side, the fourth end first bends to extend toward the first long side and then bends again to continue to extend toward the first short side to connect to the grounding portion; A first interdigitated electrode portion, located on the dielectric substrate and between the first radiating portion and the second radiating portion, one end of the first interdigitated electrode portion connecting the first end and the third end; A second interdigitated electrode portion is located on the dielectric substrate and between the first radiating portion and the second radiating portion, the second interdigitated electrode portion is interlaced with the first interdigitated electrode portion, and one end of the second interdigitated electrode portion is connected to the ground portion; A third radiating portion is located on the dielectric substrate and arranged along the first short side; A fourth radiating portion is located on the dielectric substrate and arranged along the second short side; A first signal source is connected to the third radiating portion and the ground portion; and A second signal source is connected to the fourth radiating portion and the ground portion. The multi-frequency dual antenna system as described in claim 1, wherein a first continuous bending section is further provided on the segment of the first radiating portion extending toward the second short side; and a second continuous bending section is further provided on the segment of the second radiating portion extending toward the first short side. The multi-frequency dual antenna system as described in claim 1, wherein a first continuous bending section is further provided on the segment of the first radiating portion arranged along the second long side; and a second continuous bending section is further provided on the segment of the second radiating portion arranged along the second long side. A multi-band dual antenna system as described in claim 1, wherein the third radiating portion has a fifth end and a sixth end, the fifth end is connected to the first signal source, the sixth end further extends toward the second short side, bends to extend toward the second long side, and then bends to continue to extend toward the first short side; and the fourth radiating portion has a seventh end and an eighth end, the seventh end is connected to the second signal source, the eighth end further extends toward the first short side, bends to extend toward the second long side, and then bends to continue to extend toward the second short side. A multi-frequency dual antenna system as described in claim 1, wherein the third radiating portion has a fifth end and a sixth end, the fifth end is connected to the first signal source, the sixth end further extends toward the second long side, and bends inward continuously to extend toward the first long side; and the fourth radiating portion has a seventh end and an eighth end, the seventh end is connected to the first signal source, the eighth end further extends toward the second long side, and bends inward continuously to extend toward the first long side. The multi-band dual antenna system as described in claim 1 further comprises an antenna ground plane adjacent to the first long side of the dielectric substrate, so that the ground portion is connected to the antenna ground plane. A multi-band dual-antenna system as described in claim 6, wherein the antenna ground plane is further connected to a system ground plane, and the system ground plane is located outside the antenna ground plane. The multi-frequency dual antenna system as described in claim 1 further includes a first antenna unit and a second antenna unit, the first antenna unit includes the first radiation part, the third radiation part, the first signal source and the ground part, and the second antenna unit includes the second radiation part, the fourth radiation part, the second signal source and the ground part, so that the first interdigitated electrode part and the second interdigitated electrode part are located between the first antenna unit and the second antenna unit and serve as an isolation part. A multi-frequency dual antenna system as described in claim 8, wherein the first antenna unit is mirror-symmetrical to the second antenna unit. A multi-frequency dual antenna system as described in claim 6, wherein the first signal source feeds an RF signal to the third radiating portion, and the third radiating portion couples the signal to the first radiating portion, so that the first radiating portion, the ground portion and the antenna ground plane excite a first operating mode, and the third radiating portion excites a second operating mode and a third operating mode. A multi-frequency dual antenna system as described in claim 6, wherein the second signal source feeds an RF signal to the fourth radiating portion, and the fourth radiating portion couples the signal to the second radiating portion, so that the second radiating portion, the ground portion and the antenna ground plane excite a fourth operating mode, and the fourth radiating portion excites a fifth operating mode and a sixth operating mode.

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