Antenna device
By designing symmetrical hook-shaped excitation parts and low-frequency matching bodies on the substrate of the antenna device, the return loss problem of the WiFi 7 band is solved, and higher communication quality is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2026-03-13
AI Technical Summary
Existing antenna devices have excessively high return loss in the WiFi 7 band, which cannot meet users' communication needs.
Design an antenna device including a substrate, an exciter, and a low-frequency matching element. The exciter has symmetrical hook-shaped first and second excitation parts on one side of the substrate, and the low-frequency matching element is on the other side of the substrate. This structural design reduces return loss.
It effectively reduces return loss in the WiFi 7 band, improves communication quality, and meets users' communication needs.
Smart Images
Figure CN121663171A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an antenna device, and more particularly to an antenna device having an excitation element and a low-frequency matching element. Background Technology
[0002] With the advancement of mobile communication technology, various electronic devices are constantly evolving towards greater functionality, thinner and lighter designs, and faster and more efficient data transmission. In particular, mobile communication technology is about to enter the WiFi 7 era, meeting various life applications and business needs that WiFi 6E could not achieve. By utilizing the WiFi 7 band, bandwidth can be increased, resulting in faster communication speeds. As a result, the WiFi 7 band can be applied to fields such as high-resolution video streaming, virtual reality (VR), augmented reality (AR), self-driving cars, industrial automation, telemedicine, smart cities, smart agriculture, and smart manufacturing.
[0003] However, current antenna devices still suffer from excessively high return loss in the WiFi 7 band, failing to meet users' communication needs for WiFi 7. Therefore, improving the communication quality required by antenna devices in the WiFi 7 band is one of the problems that researchers must solve. Summary of the Invention
[0004] The present invention provides an antenna device to improve the communication quality required by the antenna device in the WiFi 7 band technology.
[0005] An embodiment of the present invention discloses an antenna device comprising a substrate, an exciter, and a low-frequency matching element. The substrate has a first surface and a second surface facing away from each other. The exciter is disposed on the first surface and includes two separate first exciter portions and a second exciter portion. The two first exciter portions are symmetrical. Each first exciter portion includes a first exciter segment, a second exciter segment, a third exciter segment, a fourth exciter segment, and a fifth exciter segment. One end of the second exciter segment is perpendicularly connected to one end of the first exciter segment, and one end of the third exciter segment is perpendicularly connected to the other end of the second exciter segment, and the third exciter segment extends in a direction away from the first exciter segment. One end of the fourth exciter segment is perpendicularly connected to the other end of the third exciter segment, and the fourth exciter segment extends in a direction toward the first exciter segment. One end of the fifth exciter segment is perpendicularly connected to the other end of the fourth exciter segment, and the fifth exciter segment extends in a direction toward the first exciter segment. The two fourth exciter segments and the second exciter portion are respectively adjacent to opposite sides of the substrate. The low-frequency matching element is disposed on the second surface and is separate from the side of the substrate.
[0006] According to the antenna device of the above embodiment, since the antenna device has two first excitation parts and a second excitation part on the first side of the substrate, and a low-frequency matching body on the second side of the substrate, and the two first excitation parts are symmetrically hooked, the antenna device can excite a frequency band that can cover WiFi 7 and reduce the return loss in this frequency band to meet the user's communication needs for WiFi 7. In this way, the communication quality required by the antenna device in the WiFi 7 frequency band can be improved.
[0007] The above description of the invention and the following description of the embodiments are intended to demonstrate and explain the principles of the invention, and to provide a further explanation of the scope of the patent application. Attached Figure Description
[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0009] Figure 1 This is a three-dimensional schematic diagram of an antenna device according to an embodiment of the present invention.
[0010] Figure 2 for Figure 1 An exploded view of the antenna device.
[0011] Figure 3 for Figure 1 A planar perspective view of the antenna device.
[0012] Figure 4 for Figure 1 A plan view of the first side of the antenna device.
[0013] Figure 5 for Figure 1 A partially enlarged planar schematic diagram of the first surface of the antenna device.
[0014] Figure 6 for Figure 1 Another enlarged planar schematic diagram of the first surface of the antenna device.
[0015] Figure 7 for Figure 1 A plan view of the second side of the antenna device.
[0016] Figure 8 for Figure 1 Line graph of return loss of antenna device.
[0017] Attached image annotations:
[0018] 10: Antenna device
[0019] 11:Substrate
[0020] 111: First side
[0021] 112: Second side
[0022] 113: Third side
[0023] 114: Fourth side
[0024] 115: First Page
[0025] 116: Second page
[0026] 12: Excitation body
[0027] 121: First Excitation Section
[0028] 122: Second Excitation Section
[0029] 13: Grounding electrode
[0030] 14: Feed body
[0031] 15: Low-frequency matching body
[0032] 16: Decoupling body Detailed Implementation
[0033] Please see Figure 1 and Figure 2 . Figure 1 This is a three-dimensional schematic diagram of an antenna device according to an embodiment of the present invention. Figure 2 for Figure 1 An exploded view of the antenna device.
[0034] The antenna device 10 of this embodiment is applicable, for example, to the frequency bands of WiFi 7 (2.16 GHz to 2.55 GHz, 4.34 GHz to 8.5 GHz), and includes a substrate 11, an exciter 12, two ground bodies 13, two feed bodies 14, and a low-frequency matching body 15. The substrate 11 is made of, for example, glass fiber material, and has a first side 111, a second side 112, a third side 113, a fourth side 114, a first surface 115, and a second surface 116. The first side 111, the second side 112, the third side 113, and the fourth side 114 are connected. The first side 111 is opposite to the second side 112. The third side 113 is opposite to the fourth side 114. The first side 111, the second side 112, the third side 113, and the fourth side 114 together surround the first surface 115 and the second surface 116, and the first surface 115 and the second surface 116 are opposite to each other. The thickness T of the substrate 11 is, for example, 0.4 mm.
[0035] Please refer to the following: Figures 3 to 7 . Figure 3 for Figure 1 A planar perspective view of the antenna device. Figure 4 for Figure 1 A plan view of the first side of the antenna device. Figure 5 for Figure 1 A partially enlarged planar schematic diagram of the first surface of the antenna device. Figure 6 for Figure 1 Another enlarged planar schematic diagram of the first surface of the antenna device. Figure 7 for Figure 1 A plan view of the second side of the antenna device.
[0036] The exciter 12 is made of, for example, copper foil and is used to excite the WiFi 7 frequency band. The exciter 12 is disposed on the first surface 115 and includes two separate first exciter portions 121 and a second exciter portion 122. The two first exciter portions 121 are symmetrical. Each first exciter portion 121 includes a first exciter segment 1211, a second exciter segment 1212, a third exciter segment 1213, a fourth exciter segment 1214, and a fifth exciter segment 1215. One end of the second exciter segment 1212 is vertically connected to one end of the first exciter segment 1211. One end of the third exciter segment 1213 is vertically connected to the other end of the second exciter segment 1212, and the third exciter segment 1213 extends away from the first exciter segment 1211. One end of the fourth exciter segment 1214 is vertically connected to the other end of the third exciter segment 1213, and the fourth exciter segment 1214 extends toward the first exciter segment 1211. One end of the fifth excitation segment 1215 is vertically connected to the other end of the fourth excitation segment 1214, and the fifth excitation segment 1215 extends toward the first excitation segment 1211. In summary, each first excitation segment 121 is, for example, hook-shaped.
[0037] The two fourth excitation segments 1214 and the second excitation portion 122 are adjacent to opposite sides of the substrate 11. Specifically, the two fourth excitation segments 1214 are respectively cut flush with the first side 111 and the second side 112. The second excitation portion 122 is at least partially cut flush with the third side 113.
[0038] Furthermore, the second excitation section 122 includes a sixth excitation segment 1221, two seventh excitation segments 1222, two eighth excitation segments 1223, and two ninth excitation segments 1224. The sixth excitation segment 1221 is, for example, flush with the third side edge 113. One end of each of the two seventh excitation segments 1222 is perpendicularly connected to the opposite ends of the sixth excitation segment 1221 and extends toward the two grounding bodies 13. One end of each of the two eighth excitation segments 1223 is perpendicularly connected to the other end of each of the two seventh excitation segments 1222 and extends away from the sixth excitation segment 1221. One end of each of the two ninth excitation segments 1224 is perpendicularly connected to the other end of each of the two eighth excitation segments 1223 and extends away from the two grounding bodies 13. In summary, the opposite ends of the second excitation section 122 are, for example, hook-shaped. The ends of the two ninth excitation segments 1224 away from the two eighth excitation segments 1223 are, for example, flush with the third side edge 113.
[0039] Two grounding electrodes 13, for example, are made of copper foil and are disposed on the first surface 115. Each grounding electrode 13 is connected to the end of the first excitation segment 1211 away from the second excitation segment 1212 and is, for example, flush with the fourth side 114. The two eighth excitation segments 1223 are spaced apart from the two grounding electrodes 13 by a distance. Two feeders 14 are used to feed signals. Each feeder 14 is located between the first excitation segment 1211 and the grounding electrode 13. The distance D2 between each feeder 14 and the fourth side 114 is, for example, smaller than the distance D1 between each fifth excitation segment 1215 and the fourth side 114. The total length of the second excitation section 122 is, for example, less than or equal to the distance between the two feeders 14.
[0040] The low-frequency matching element 15 is made of copper foil, for example, and is used to widen the bandwidth of the low-frequency mode. The low-frequency matching element 15 is disposed on the second surface 116 and is separated from the first side 111, second side 112, third side 113, and fourth side 114 of the substrate 11. Specifically, the low-frequency matching element 15 includes a first matching segment 151 and two second matching segments 152. The first matching segment 151 is located near the fourth side 114. The two second matching segments 152 are respectively connected to opposite ends of the first matching segment 151 and extend towards the third side 113. In summary, the low-frequency matching element 15 is, for example, U-shaped. The spacing between the two second matching segments 152 is, for example, greater than the spacing between the two feed elements 14.
[0041] In this embodiment, since the antenna device 10 has two first excitation portions 121 and a second excitation portion 122 on the first surface 115 of the substrate 11, and a low-frequency matching body 15 on the second surface 116 of the substrate 11, and the two first excitation portions 121 are symmetrically hooked, the antenna device 10 can excite a frequency band that covers WiFi 7 and reduce the return loss in this frequency band to meet the user's communication needs for WiFi 7. In this way, the communication quality required by the antenna device 10 in the WiFi 7 frequency band can be improved.
[0042] Furthermore, by having two fourth excitation sections 1214 aligned with the first side 111 and the second side 112 respectively, the second excitation section 122 at least partially aligned with the third side 113, and the two grounding bodies 13 aligned with the fourth side 114, the antenna device 10 can further excite a frequency band that can cover WiFi 7 and further reduce the return loss in this frequency band.
[0043] In this embodiment, the antenna device 10 may further include a decoupling body 16. The decoupling body 16 is made of, for example, copper foil and is used to improve the isolation effect of the two first excitation sections 121. The decoupling body 16 is disposed on the first surface 115 and includes a first decoupling segment 161, two second decoupling segments 162, two third decoupling segments 163, two fourth decoupling segments 164, and a fifth decoupling segment 165. The first decoupling segment 161 is, for example, cut flush with the fourth side 114. The two second decoupling segments 162 are respectively vertically connected to opposite ends of the first decoupling segment 161 and extend toward the second excitation section 122. The two third decoupling segments 163 are respectively vertically connected to the other ends of the two second decoupling segments 162 and extend away from the first decoupling segment 161. The two fourth decoupling segments 164 are respectively vertically connected to the other ends of the two third decoupling segments 163 and extend toward the second excitation section 122. The two ends of the fifth decoupling segment 165 are respectively connected to the two fourth decoupling segments 164. In summary, the decoupling body 16 is, for example, in the shape of an inverted U. That is, the area surrounded by the first decoupling segment 161, the two second decoupling segments 162, the two third decoupling segments 163, the two fourth decoupling segments 164, and the fifth decoupling segment 165 is not provided with copper foil. The fifth decoupling segment 165 is separated from the second excitation part 122 by a gap D5. The first decoupling segment 161 and at least part of the two second decoupling segments 162 are located between the two grounding bodies 13.
[0044] In this embodiment, the antenna device 10 may also include a capacitor (not shown), an inductor (not shown), or a resistor (not shown). The capacitor, inductor, or resistor decoupler 16 further enhances the isolation effect between the two first excitation sections.
[0045] In this embodiment, the length L1 of each first excitation segment 1211 is, for example, 2 mm. The width W1 of each first excitation segment 1211 is, for example, 0.7 mm. The length L2 of each second excitation segment 1212 is, for example, 2.5 mm. The width W2 of each second excitation segment 1212 is, for example, 0.9 mm. The length L3 of each third excitation segment 1213 is, for example, 4.4 mm. The width W3 of each second excitation segment 1212 is, for example, 1 mm. The length L4 of each fourth excitation segment 1214 is, for example, 1.7 mm. The width W4 of each fourth excitation segment 1214 is, for example, 1 mm. The length L5 of each fifth excitation segment 1215 is, for example, 2.6 mm. The width W5 of each fifth excitation segment 1215 is, for example, 1 mm. The distance D1 between each fifth excitation segment 1215 and the fourth side 114 is, for example, 0.8 mm.
[0046] In this embodiment, the length L6 of the sixth excitation segment 1221 is, for example, 15 mm. The width W6 of the sixth excitation segment 1221 is, for example, 0.5 mm. The length L7 of each seventh excitation segment 1222 is, for example, 1.25 mm. The width W7 of each seventh excitation segment 1222 is, for example, 0.5 mm. The length L8 of each eighth excitation segment 1223 is, for example, 2 mm. The width W8 of each eighth excitation segment 1223 is, for example, 0.5 mm. The length L9 of each ninth excitation segment 1224 is, for example, 1.75 mm. The width W9 of each ninth excitation segment 1224 is, for example, 0.5 mm.
[0047] In this embodiment, the length L10 of each grounding body 13 is, for example, 5 mm. The width W10 of each grounding body 13 is, for example, 2.2 mm. The length L11 of each feeder 14 is, for example, 0.7 mm. The width W11 of each feeder 14 is, for example, 0.5 mm. The distance D2 between each feeder 14 and the fourth side 114 is, for example, 0.3 mm.
[0048] In this embodiment, the length L12 of the first matching segment 151 is, for example, 23.6 mm. The width W12 of the first matching segment 151 is, for example, 1.4 mm. The length L13 of each second matching segment 152 is, for example, 2 mm. The width W13 of each second matching segment 152 is, for example, 1.2 mm. The distance D3 between the first matching segment 151 and the fourth side 114 is, for example, 0.6 mm.
[0049] In this embodiment, the length L14 of the first decoupling segment 161 is, for example, 4 mm. The width W14 of the first decoupling segment 161 is, for example, 1 mm. The distance D4 between the first decoupling segment 161 and the two grounding bodies 13 is, for example, 2 mm each. The length L15 of each second decoupling segment 162 is, for example, 1.6 mm. The width W15 of each second decoupling segment 162 is, for example, 0.7 mm. The length L16 of each third decoupling segment 163 is, for example, 2.7 mm. The width W16 of each third decoupling segment 163 is, for example, 0.4 mm. The length L17 of each fourth decoupling segment 164 is, for example, 0.8 mm. The width W17 of each fourth decoupling segment 164 is, for example, 0.5 mm. The length L18 of the fifth decoupling segment 165 is, for example, 8 mm. The width W18 of the fifth decoupling segment 165 is, for example, 0.5 mm. The distance D5 between the fifth decoupling section 165 and the second excitation section 122 is, for example, greater than or equal to 0.2 mm.
[0050] In this embodiment, the second excitation section 122 includes a sixth excitation segment 1221, two seventh excitation segments 1222, two eighth excitation segments 1223, and two ninth excitation segments 1224, making the second excitation section 122 hook-shaped, but not limited thereto. In other embodiments, the second excitation section may also include only the sixth excitation segment, making the second excitation section, for example, strip-shaped.
[0051] In this embodiment, the antenna device 10 is provided with a decoupling element 16, but this is not a limitation. In other embodiments, the antenna device may not be provided with a decoupling element.
[0052] In this embodiment, the area surrounded by the first decoupling segment 161, the two second decoupling segments 162, the two third decoupling segments 163, the two fourth decoupling segments 164, and the fifth decoupling segment 165 of the decoupling body 16 is not provided with copper foil, but this is not a limitation. In other embodiments, the area surrounded by the first decoupling segment, the two second decoupling segments, the two third decoupling segments, the two fourth decoupling segments, and the fifth decoupling segment of the decoupling body may also be provided with copper foil.
[0053] In this embodiment, the two fourth excitation segments 1214 are respectively aligned with the first side 111 and the second side 112, the second excitation part 122 is at least partially aligned with the third side 113, the two grounding bodies 13 are aligned with the fourth side 114, and the first decoupling segment 161 is aligned with the fourth side 114, but this is not a limitation. In other embodiments, the two fourth excitation segments may not be aligned with the first side and the second side, the second excitation part may not be aligned with the third side, the two grounding bodies may not be aligned with the fourth side, and the first decoupling segment may not be aligned with the fourth side.
[0054] Please refer to the following: Figure 8 . Figure 8 for Figure 1 The image shows a line graph illustrating the return loss of the antenna device 10. In this embodiment, in the low-frequency mode band (2.16 GHz to 2.55 GHz) or the high-frequency mode band (4.34 GHz to 8.5 GHz), the return loss of the antenna device 10 in this embodiment is below -6 dB in all frequency bands except for a few bands where the return loss is slightly higher than -6 dB, and even lower than -10 dB in some bands. In other words, through the aforementioned structural design, the antenna device 10 in this embodiment has good impedance matching.
[0055] Furthermore, generally speaking, the higher the antenna gain, the more concentrated the antenna radiation, which allows the signal to travel a greater distance in a specific direction. In this embodiment, the antenna device 10 has a gain of 1.55 dBi at 2.4 GHz and a gain of 5.29 dBi at 5.5 GHz in the aforementioned frequency band.
[0056] According to the antenna device of the above embodiment, since the antenna device has two first excitation parts and a second excitation part on the first side of the substrate, and a low-frequency matching body on the second side of the substrate, and the two first excitation parts are symmetrically hooked, the antenna device can excite a frequency band that can cover WiFi 7 and reduce the return loss in this frequency band to meet the user's communication needs for WiFi 7. In this way, the communication quality required by the antenna device in the WiFi 7 frequency band can be improved.
[0057] Furthermore, by having two fourth excitation sections aligned with the first and second sides respectively, the second excitation section at least partially aligned with the third side, and the two grounding bodies aligned with the fourth side, the antenna device can be further made to excite a frequency band that can cover WiFi 7, and the return loss in this frequency band can be further reduced.
[0058] Although the present invention has been disclosed above with reference to the foregoing embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the claims defined in the appended specification.
Claims
1. An antenna device, characterized in that, The antenna device includes: A substrate having a first surface and a second surface facing away from each other; An exciter is disposed on the first surface and includes two separate first exciter portions and a second exciter portion. The two first exciter portions are symmetrical. Each first exciter portion includes a first exciter segment, a second exciter segment, a third exciter segment, a fourth exciter segment, and a fifth exciter segment. One end of the second exciter segment is perpendicularly connected to one end of the first exciter segment. One end of the third exciter segment is perpendicularly connected to the other end of the second exciter segment and extends away from the first exciter segment. One end of the fourth exciter segment is perpendicularly connected to the other end of the third exciter segment and extends towards the first exciter segment. One end of the fifth exciter segment is perpendicularly connected to the other end of the fourth exciter segment and extends towards the first exciter segment. The two fourth exciter segments and the second exciter portion are respectively adjacent to opposite sides of the substrate. A low-frequency matching element is disposed on the second surface and is separated from the side of the substrate.
2. The antenna device according to claim 1, characterized in that, It also includes two grounding bodies, which are disposed on the first surface. Each grounding body is connected to the end of the first excitation segment away from the second excitation segment. The substrate also has a first side, a second side, a third side, and a fourth side connected together. The first side is opposite to the second side, and the third side is opposite to the fourth side. The first side, the second side, the third side, and the fourth side together surround the first surface and the second surface. The two fourth excitation segments are respectively cut flush with the first side and the second side. The second excitation segment is at least partially cut flush with the third side. The two grounding bodies are cut flush with the fourth side.
3. The antenna device according to claim 2, characterized in that, It also includes two feed bodies, which are disposed on the first surface. Each feed body is located between the first excitation section and the ground body. The distance between each feed body and the fourth side is less than the distance between each fifth excitation section and the fourth side, and the total length of the second excitation section is less than or equal to the distance between the two feed bodies.
4. The antenna device according to claim 3, characterized in that, Each of the following first excitation segments has a length of 2 mm and a width of 0.7 mm: each of the second excitation segments has a length of 2.5 mm and a width of 0.9 mm: each of the third excitation segments has a length of 4.4 mm and a width of 1 mm: each of the fourth excitation segments has a length of 1.7 mm and a width of 1 mm: each of the fifth excitation segments has a length of 2.6 mm and a width of 1 mm: the distance between each fifth excitation segment and the fourth side is 0.8 mm: each of the following grounding electrodes has a length of 5 mm and a width of 2.2 mm: each of the following feed electrodes has a length of 0.7 mm and a width of 0.5 mm: the distance between each feed electrode and the fourth side is 0.3 mm:
5. The feature of claim 3 is that the low-frequency matching body includes a first matching segment and two second matching segments, the first matching segment is close to the fourth side, the two second matching segments are respectively connected to the opposite ends of the first matching segment and extend toward the third side, and the distance between the two second matching segments is greater than the distance between the two feed bodies.
6. The antenna device according to claim 5, characterized in that, The length of the first matching segment is 23.6 mm, the width of the first matching segment is 1.4 mm, the length of each second matching segment is 2 mm, the width of each second matching segment is 1.2 mm, and the distance between the first matching segment and the fourth side is 0.6 mm.
7. The antenna device according to claim 2, characterized in that, The second excitation section includes a sixth excitation segment, two seventh excitation segments, two eighth excitation segments, and two ninth excitation segments. The sixth excitation segment is flush with the third side. One end of each of the two seventh excitation segments is vertically connected to the opposite ends of the sixth excitation segment and extends toward the two grounding bodies. One end of each of the two eighth excitation segments is vertically connected to the other end of each of the two seventh excitation segments and extends away from the sixth excitation segment. One end of each of the two ninth excitation segments is vertically connected to the other end of each of the two eighth excitation segments and extends away from the two grounding bodies. The ends of the two ninth excitation segments away from the two eighth excitation segments are flush with the third side, and the two eighth excitation segments are spaced apart from the two grounding bodies by a distance.
8. The antenna device according to claim 7, characterized in that, The sixth excitation segment has a length of 15 mm and a width of 0.5 mm. Each of the seventh excitation segments has a length of 1.25 mm and a width of 0.5 mm. Each of the eighth excitation segments has a length of 2 mm and a width of 0.5 mm. Each of the ninth excitation segments has a length of 1.75 mm and a width of 0.5 mm.
9. The antenna device according to claim 2, characterized in that, It also includes a decoupling body disposed on the first surface and comprising a first decoupling segment, two second decoupling segments, two third decoupling segments, two fourth decoupling segments, and a fifth decoupling segment. The first decoupling segment is flush with the fourth side. The two second decoupling segments are perpendicularly connected to opposite ends of the first decoupling segment and extend toward the second excitation section. The two third decoupling segments are perpendicularly connected to the other ends of the two second decoupling segments and extend away from the first decoupling segment. The two fourth decoupling segments are perpendicularly connected to the other ends of the two third decoupling segments and extend toward the second excitation section. The opposite ends of the fifth decoupling segment are connected to the two fourth decoupling segments. The fifth decoupling segment is separated from the second excitation section by a gap, and the first decoupling segment and at least a portion of the two second decoupling segments are located between the two grounding bodies.
10. The antenna device according to claim 9, characterized in that, The first decoupling segment has a length of 4 mm and a width of 1 mm. The distance between the first decoupling segment and each of the two grounding bodies is 2 mm. The length of each second decoupling segment is 1.6 mm and the width of each second decoupling segment is 0.7 mm. The length of each third decoupling segment is 2.7 mm and the width of each third decoupling segment is 0.4 mm. The length of each fourth decoupling segment is 0.8 mm and the width of each fourth decoupling segment is 0.5 mm. The length of the fifth decoupling segment is 8 mm and the width of the fifth decoupling segment is 0.5 mm. The distance between the fifth decoupling segment and the second excitation part is greater than or equal to 0.2 mm.