A 5G WiFi antenna

Abstract

The embodiment of the present application discloses a 5G WiFi antenna. The antenna comprises a substrate, a copper-coated area on the surface of the substrate, and an antenna radiator arranged on the copper-coated area; wherein the antenna radiator comprises a first "L"-shaped radiation slot, a second "L"-shaped radiation slot, and a feed source; the first "L"-shaped radiation slot comprises a first branch and a second branch, the second "L"-shaped radiation slot comprises a third branch and a fourth branch, the third branch is arranged along the direction of the second branch, the end of the third branch is close to the inner corner of the first "L"-shaped radiation slot, and the end of the fourth branch is located on the same side of the end of the first branch; the feed source is arranged in the first branch. The 5G WiFi antenna provided by the embodiment of the present application has the advantages of low profile, low cost, and easy production and assembly.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the technical field of communication antennas, in particular to a 5G WiFi antenna. BACKGROUND

[0002] A conventional wireless terminal product WiFi antenna is usually designed in the form of flexible FPC plus a plastic support or a metal insert. The two forms of antennas and supports need separate mold opening, the cost of the antenna itself is high, and the late assembly is complex. Meanwhile, the metal part is prone to deformation and breakage in the process of antenna assembly or transportation, which increases the project design cost, and the three-dimensional structure of the antenna also occupies a large space in the height direction, which is not conducive to the miniaturization of wireless products. SUMMARY

[0003] The embodiment of the application provides a 5G WiFi antenna to solve the problems of high antenna cost, great late assembly difficulty and large space occupation in the height direction.

[0004] The embodiment of the application provides a 5G WiFi antenna, which comprises a base material, a copper-coated area on the surface of the base material and an antenna radiator arranged on the copper-coated area.

[0005] The antenna radiator comprises a first "L"-shaped radiation slot, a second "L"-shaped radiation slot and a feed source.

[0006] The first "L"-shaped radiation slot comprises a first branch and a second branch, the second "L"-shaped radiation slot comprises a third branch and a fourth branch, the third branch is arranged along the direction of the second branch, the end of the third branch is close to the inner corner of the first "L"-shaped radiation slot, and the end of the fourth branch is located on the same side of the end of the first branch.

[0007] The feed source is arranged in the first branch.

[0008] Optionally, the second branch and the third branch are arranged in parallel.

[0009] Optionally, the width of the first "L"-shaped radiation slot is greater than the width of the second "L"-shaped radiation slot.

[0010] Optionally, the width of the first "L"-shaped radiation slot is 2 mm, and the width of the second "L"-shaped radiation slot is 1 mm.

[0011] Optionally, the length of the first branch is greater than the length of the fourth branch.

[0012] Optionally, the antenna radiator further comprises a first pad and a second pad, the first pad and the second pad are respectively located on two sides of the first branch, and are used to form the feed.

[0013] Optionally, the antenna is a double-layer PCB printed structure, the first pad and the second pad are arranged on the back side of the substrate relative to the copper clad area, the first pad is connected to the copper clad area through a first via, and the second pad is connected to the copper clad area through a second via.

[0014] Optionally, the antenna is a single-layer PCB printed structure, and the first pad and the second pad are directly arranged on the copper clad area.

[0015] Optionally, the area of the first pad is greater than the area of the second pad, the first pad is used for welding the outer core of the coaxial line, and the second pad is used for welding the inner core of the coaxial line.

[0016] Optionally, the first branch is divided into a first sub-branch and a second sub-branch by the feed as a division point, the second sub-branch is connected with the second branch, and the length of the first sub-branch is 8 mm.

[0017] The embodiment of the present application provides a 5G WiFi antenna, which comprises a substrate, a copper clad area on the surface of the substrate and an antenna radiator arranged on the copper clad area, wherein the antenna radiator comprises two "L" type radiation slots with a certain mutual positional relationship, and a feed is arranged on one of the two slots, the two slots respectively generate a frequency point resonance and have a certain bandwidth, and then the two slots can be combined together in the frequency domain, so as to finally form an antenna which can meet the WiFi 5G frequency band, and the antenna has the advantages of low profile, low cost and easy production and assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structural schematic diagram of the 5G WiFi antenna provided by the embodiment of the present application is provided.

[0019] Figure 2 A structural schematic diagram of another 5G WiFi antenna provided by the embodiment of the present application is provided.

[0020] Figure 3 An S11 parameter diagram using a single radiation slot provided by the embodiment of the present application is provided.

[0021] Figure 4 An S11 parameter diagram using a double radiation slot provided by the embodiment of the present application is provided.

[0022] Figure 5 A far-field EH lobe diagram of 5.255GHz resonance provided by the embodiment of the present application is provided.

[0023] Figure 6 Far field EH plane lobe diagram of 5.835GHz resonance provided for the embodiment one of the present application;

[0024] Figure 7 S11 parameter diagram provided for the embodiment one of the present application using different length of first sub-branch. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0026] In addition, the terms "first", "second", and the like can be used herein to describe various directions, actions, steps or elements, etc., but these directions, actions, steps or elements are not limited by these terms. These terms are only used to distinguish the first direction, action, step or element from another direction, action, step or element. For example, without departing from the scope of the present application, the first branch can be called the second branch, and similarly, the second branch can be called the first branch. The first branch and the second branch are both branches, but they are not the same branch. The terms "first", "second", and the like cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0027] Embodiment one

[0028] Figure 1 Structure diagram of 5G WiFi antenna provided for the embodiment one of the present application, the present embodiment can be applied to the case of providing WiFi antenna for wireless communication products. As shown in Figure 1As shown, the antenna comprises a substrate 100, a coppered area 200 on the surface of the substrate 100, and an antenna radiator arranged on the coppered area 200; wherein the antenna radiator comprises a first "L"-shaped radiation slot 310, a second "L"-shaped radiation slot 320, and a feed 330; the first "L"-shaped radiation slot 310 comprises a first branch 311 and a second branch 312, the second "L"-shaped radiation slot 320 comprises a third branch 321 and a fourth branch 322, the third branch 321 is arranged along the direction of the second branch 312, and the end of the third branch 321 is close to the inner corner of the first "L"-shaped radiation slot 310, and the end of the fourth branch 322 is on the same side of the end of the first branch 311 as the end of the third branch 321; the feed 330 is arranged in the first branch 311.

[0029] Specifically, the antenna provided by the embodiment can adopt a PCB printed structure, the substrate 100 can adopt FR4 material, the thickness can be selected as 1.6 millimeters, the dielectric constant can be selected as 4.6, the loss tangent can be selected as 0.019, and the board size can be 165.0 millimeters (length) * 165.0 millimeters (width). The surface of the substrate 100 can be coppered in a large area to determine the coppered area 200, and specifically, the coppering can be performed at the center position of the top surface of the substrate 100, and the coppering area can be greater than 60%. Then the antenna radiator can be designed on the coppered area 200 on the surface of the PCB, and the maximum size profile of the antenna radiator can occupy an area of 18.3 millimeters (length) * 16.0 millimeters (width), including two "L"-shaped radiation slots opened on the coppered area 200, the first "L"-shaped radiation slot 310 can be used as a main radiation slot, and the second "L"-shaped radiation slot 320 can be used as a parasitic radiation slot, and the two radiation slots can be integrally formed. For example, Figure 1As shown, the first "L" type radiation slot 310 includes a first branch 311 and a second branch 312, the second "L" type radiation slot 320 includes a third branch 321 and a fourth branch 322, the second branch 312 and the third branch 321 can be close to each other, and the third branch 321 is arranged at one side of the inner corner of the first "L" type radiation slot 310, and the end of the third branch 321 is close to the inner corner, that is, the fourth branch 322 is located at the other side of the third branch 321 relative to the first branch 311, and at the same time, the third branch 321 can extend beyond the second branch 312. Optionally, the second branch 312 can be arranged in parallel with the third branch 321. The end of the fourth branch 322 and the end of the first branch 311 are located at the same side of the third branch 321, that is, the fourth branch 322 can have the same extension direction as the first branch 311, and at the same time, the length of the first branch 311 can be greater than the length of the fourth branch 322. After determining the above positional relationship, the feed 330 can be arranged in the first branch 311, and specifically can be arranged in the projection range of the fourth branch 322 on the first branch 311, which can represent the actual coaxial feed line excitation.

[0030] Optionally, the width of the first "L" type radiation slot 310 is greater than the width of the second "L" type radiation slot 320. Under the same medium condition, the length of each current flowing through the slot corresponds to a resonant frequency point, the higher the frequency, the shorter the path corresponding to the resonant current, and the shorter the antenna resonant arm, and the lower the frequency, the longer the path corresponding to the resonant current, and the longer the wireless resonant arm. In the embodiment, the first "L" type radiation slot 310 can be mainly used to realize the resonant point of a lower frequency, and the second "L" type radiation slot 320 can be mainly used to realize the resonant point of a higher frequency. Further optionally, the width of the first "L" type radiation slot 310 is 2mm, and the width of the second "L" type radiation slot 320 is 1mm.

[0031] On the basis of the above technical solution, optionally, as Figure 2As shown, the antenna radiator further comprises a first pad 331 and a second pad 332, which are respectively located on both sides of the first branch 311 to form the feed 330. Specifically, the first pad 331 and the second pad 332 can be respectively welded with the inner core and the outer core of the coaxial line to realize coaxial feed line excitation through the coaxial line. Optionally, the area of the first pad 331 is greater than the area of the second pad 332, the first pad 331 is used for welding the outer core of the coaxial line, and the second pad 332 is used for welding the inner core of the coaxial line, that is, the outer core of the coaxial line can be welded with the pad with a larger area. Of course, the area of the first pad 331 can also be smaller than the area of the second pad 332, and at this time the first pad 331 is used for welding the inner core of the coaxial line, and the second pad 332 is used for welding the outer core of the coaxial line.

[0032] Further optionally, the antenna is a double-layer PCB printed structure, the first pad and the second pad are arranged on the back side of the substrate 100 relative to the copper clad area 200, the first pad is connected to the copper clad area 200 through a first via, and the second pad is connected to the copper clad area 200 through a second via. Specifically, the side where the copper clad area 200 is located can be used as the top surface of the PCB, and the first pad and the second pad can be arranged on the back surface of the PCB, specifically, they can be arranged on both sides of the first branch 311 close to the feed 330. Meanwhile, a first via and a second via can be arranged at the corresponding positions on the PCB, so as to connect the first pad and the copper clad area 200 through the first via, and connect the second pad and the copper clad area 200 through the second via, to realize coaxial feed line excitation.

[0033] Alternatively, the antenna is a single-layer PCB printed structure, and the first pad and the second pad are directly arranged on the copper clad area 200. That is, as shown in Figure 2 the first pad 331 and the second pad 332 can be directly arranged on both sides of the first branch 311 close to the feed 330 on the copper clad area 200, so that the PCB can be simplified from a double-layer board to a single-layer board, and the welding process is more convenient.

[0034] Based on the above antenna structure, when feeding, high-frequency current along the inner core of the coaxial line reaches the gap on the copper clad area 200 on the PCB surface through one of the pads and flows along the gap, and then reaches the outer core of the coaxial line through the other pad to form a return flow. When there is only the first "L"-shaped radiation gap 310, only one resonance can be generated within the corresponding working bandwidth of the wireless communication product, and the distribution of the resonance current and the S11 parameter are as follows: Figure 3As shown, at this time the resonance point is at 5.55GHz, and the S11 parameter is above -10dB, indicating poor matching with a 50-ohm coaxial line. When the second "L"-shaped radiation slot 320 is added, the first "L"-shaped radiation slot 310 has a relatively long physical size, which produces a relatively low resonance point fa, and a part of the energy is coupled from the second branch 312 to the third branch 321, so as to produce another resonance point fb on the second "L"-shaped radiation slot 320. Since the physical size of the second "L"-shaped radiation slot 320 is smaller than that of the first "L"-shaped radiation slot 310, the resonance point fb produced thereby is higher than fa. By appropriately optimizing the lengths of the second branch 312 and the third branch 321 and the relative positions between the two radiation slots, two resonance points at 5.255GHz and 5.835GHz are produced, each of which has a certain bandwidth and is close to each other, as shown in Figure 4 As shown, finally, the S11 parameter thereof is less than -10dB at 5.06-5.97GHz, and good resonance characteristics are exhibited within the bandwidth, satisfying the bandwidth requirement of WiFi 5GHz (center frequency 5.18-5.825GHz). The resonance at 5.255GHz is primarily completed by the first "L"-shaped radiation slot 310 in the preliminary design, but the resonance at this point is finally completed by the two slots together due to the influence of the loading of the second "L"-shaped radiation slot 320, and the far-field EH plane lobe diagram of the resonance is as shown in Figure 5 As shown, the resonance at 5.835GHz is primarily completed by the second "L"-shaped radiation slot 320 in the preliminary design, but the first "L"-shaped radiation slot 310 also has a certain influence, and the far-field EH plane lobe diagram of the resonance is as shown in Figure 6 As shown.

[0035] On the basis of the above technical solution, optionally, the first branch 311 is divided into a first sub-branch and a second sub-branch with the feed 330 as a dividing point, the second sub-branch is connected with the second branch 312, and the length of the first sub-branch is 8mm. Specifically, the first sub-branch is more important in adjusting the bandwidth and standing wave of the antenna in the case of affecting the size of the resonance frequency of the antenna, so as to make the antenna have better matching and resonance characteristics. The experimental data of using different lengths of the first sub-branch are as shown in Figure 7 As shown, it can be seen that taking the length of the first sub-branch as 8mm can make the antenna have a larger bandwidth, and the S11 parameter within the bandwidth is less than -10dB.

[0036] The 5G WiFi antenna provided by the embodiment of the application comprises a base material, a copper-coated area on the surface of the base material, and an antenna radiator arranged on the copper-coated area, wherein the antenna radiator comprises two L-shaped radiation slots with a certain mutual positional relationship, a feed source is arranged on one of the two slots, each of the two slots generates a frequency point resonance and has a certain bandwidth, and the two slots can be combined together in the frequency domain to finally form an antenna that can meet the WiFi 5G frequency band, and the antenna has the advantages of low profile, low cost, and easy production and assembly.

[0037] It should be noted that the above are only the preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A 5G WiFi antenna, characterized by, The antenna comprises: a substrate, a copper-plated area on a surface of the substrate, and an antenna radiator disposed on the copper-plated area; wherein the antenna radiator comprises a first "L"-shaped radiation slot, a second "L"-shaped radiation slot, and a feed source, and a maximum dimension outline area of the antenna radiator is 18.3 mm long by 16.0 mm wide; the first "L"-shaped radiation slot comprises a first branch and a second branch, the second "L"-shaped radiation slot comprises a third branch and a fourth branch, the third branch is disposed along the direction of the second branch, and an end of the third branch is close to an inner corner of the first "L"-shaped radiation slot, the fourth branch is located on the other side of the third branch relative to the first branch, and an end of the fourth branch is located on the same side of the third branch as an end of the first branch; the feed source is disposed in the first branch, specifically in a projection range of the fourth branch on the first branch.

2. The 5G WiFi antenna of claim 1, wherein, The second branch is disposed in parallel with the third branch.

3. The 5G WiFi antenna of claim 1, wherein, The width of the first "L"-shaped radiation slot is greater than the width of the second "L"-shaped radiation slot.

4. The 5G WiFi antenna of claim 3, wherein, The width of the first "L"-shaped radiation slot is 2 mm, and the width of the second "L"-shaped radiation slot is 1 mm.

5. The 5G WiFi antenna of claim 1, wherein, The length of the first branch is greater than the length of the fourth branch.

6. The 5G WiFi antenna of claim 1, wherein, The antenna radiator further comprises a first pad and a second pad, the first pad and the second pad are respectively located on both sides of the first branch to form the feed source.

7. The 5G WiFi antenna of claim 6, wherein, The antenna is a double-layer PCB printed structure, the first pad and the second pad are disposed on the back side of the substrate relative to the copper-plated area, the first pad is connected to the copper-plated area through a first via, and the second pad is connected to the copper-plated area through a second via.

8. The 5G WiFi antenna of claim 6, wherein, The antenna is a single-layer PCB printed structure, the first pad and the second pad are directly disposed on the copper-plated area.

9. The 5G WiFi antenna of claim 6, wherein, The area of the first pad is greater than the area of the second pad, the first pad is used for welding an outer core of a coaxial line, and the second pad is used for welding an inner core of the coaxial line.

10. The 5G WiFi antenna of claim 1, wherein, The first branch is divided into a first sub-branch and a second sub-branch by the feed source as a division point, the second sub-branch is connected to the second branch, and the length of the first sub-branch is 8 mm.

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