A multi-band microstrip antenna for WiFi 7 / Bluetooth / X-band

Abstract

The present invention discloses a multi - band microstrip antenna for WiFi7 / Bluetooth / X - band. A rectangular metal floor is provided at the bottom of the rectangular dielectric substrate; an improved short - sleeve - type metal radiator and a microstrip line are provided at the top of the rectangular dielectric substrate. The improved short - sleeve - type metal evolves from the following process: a semi - circular groove and a rectangular groove are drilled in the upper part of the surface of the short - sleeve - type metal, a rectangular metal is added at the cuffs on both sides of the short - sleeve - type metal, and the left and right right - angled parts are cut off at the lower part of the short - sleeve - type metal; an opening - left "U" - shaped groove is drilled on the microstrip line, and an L - shaped metal is arranged on both sides of the microstrip line. The present invention can cover the frequency bands of 2.12 - 2.55 GHz, 4.67 - 5.38 GHz, and 5.7 - 14.56 GHz. The maximum peak gain of the antenna is 5.43 dBi. The antenna structure is simple and the size is small, having good practical value in mobile terminal communication.

Description

Technical Field

[0001] The present invention relates to the technical field of multi - frequency wireless communication, and specifically to a multi - frequency microstrip antenna for WiFi7 / Bluetooth / X - band. Background Art

[0002] At present, wireless communication has developed to the WiFi 7 era. There is data indicating that the transmission rate of WiFi 7 is more than three times that of WiFi6, reaching up to 30 Gbits per second at most. Research shows that the core of the R & D of WiFi 7 wireless terminal communication technology is more data streams, low latency, and wide bandwidth.

[0003] A large number of studies on WiFi wireless communication have been carried out at home and abroad. Many of these studies only cover some frequency bands. The single - frequency band and relatively narrow bandwidth of the antenna have a great impact on the high - speed transmission and low latency of the wireless communication network. Therefore, achieving multi - frequency coverage of the antenna is a key issue.

[0004] Currently, there are more and more types of electronic products, and different communication methods use different frequencies. This requires developing a single mobile device that includes multiple frequency bands to meet the use of mainstream frequency bands such as WiFi, Bluetooth, 4G / 5G, etc. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi - frequency microstrip antenna for WiFi7 / Bluetooth / X - band; the invention has the advantages of simple structure, wide bandwidth, high gain, omnidirectional radiation at low frequencies, and directional radiation at high frequencies.

[0006] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0007] A multi - frequency microstrip antenna for WiFi7 / Bluetooth / X - band, including a rectangular parallelepiped dielectric substrate. It is characterized in that a rectangular metal floor is provided at the bottom of the rectangular parallelepiped dielectric substrate; the top of the dielectric substrate is composed of an improved metal radiator and a microstrip feeder. The improved metal radiator is formed by: cutting a semi - circular groove in its upper part, cutting a rectangular groove below the semi - circular groove, adding a rectangular metal patch on each side of the metal, and cutting off two right - angled corners on the left and right at its lower part; the microstrip feeder is made of metal, with a "U" - shaped groove opening to the left cut in the feeder, and an "L" - shaped metal patch arranged on both sides of the microstrip feeder. The microstrip feeder is loaded on the top of the dielectric substrate, and the microstrip feeder structure is provided with a feeding point.

[0008] Preferably, the rectangular parallelepiped serves as the dielectric substrate, and the microstrip feeder is used for feeding the antenna. Adding a rectangular metal patch on each side of the metal, cutting the semi - circular groove and cutting off the left and right right - angled corners are used to increase the bandwidth of the antenna, and the rectangular groove, "L" - shaped groove and "U" - shaped groove are used to improve the matching effect of the antenna.

[0009] Preferably, the cuboid dielectric substrate is made of FR-4, with a dielectric constant of 4.4, a length of 46 mm, a width of 42 mm, and a height of 1.6 mm. The side with the printed microstrip line is the front of the dielectric substrate, and the side with the printed metal floor is the back of the dielectric substrate.

[0010] Preferably, the microstrip feeder is centered, and a "U"-shaped slot opening to the left is formed on the microstrip feeder. There is 1 "L"-shaped metal patch on each side of the microstrip feeder and they are symmetrically distributed. The "U"-shaped slot opens to the left, with the lengths of the slots being 1.2 mm and 3.8 mm respectively, and the widths of the slots being 0.4 mm. The long side of the "L"-shaped metal is 9 mm long and 1.1 mm wide, and the short side is 6.1 mm long and 1 mm wide. The length of the microstrip feeder is 14.5 mm, and the width of the microstrip feeder is 2.9 mm.

[0011] Preferably, the radius of the semi-circular slot is 6 mm, and it is located above the metal. The rectangular slot is directly below the semi-circular slot, with a length of 12 mm and a width of 1 mm. The rectangular patches are located on both sides of the metal radiator, with a length of 6 mm and a width of 0.5 mm. The cut left and right right angles are located at the lower part of the metal radiator, and the length of the short side of the subtracted triangle is 2.4 mm, and the length of the vertical long side is 6.3 mm.

[0012] Preferably, the edge of the "L"-shaped metal is 0.55 mm away from the feeder.

[0013] Preferably, the back of the dielectric substrate is tinned according to the structure of the floor, and the front of the dielectric substrate is tinned according to the improved metal radiator structure and microstrip feeder structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The antenna of the present invention can cover WiFi 7 / Bluetooth / 4G / 5G and C / X / Ku frequency bands, with the frequency bands being 2.12 - 2.55 GHz, 4.67 - 5.38 GHz, and 5.7 - 14.56 GHz, and the relative bandwidths being 18.42%, 14.13%, and 87.46% respectively. The antenna gain is between 1.74 - 5.43 dBi within the sky frequency band, and omnidirectional coverage can be basically achieved at low frequencies; directional radiation at high frequencies.

[0016] (2) The gains at the resonant frequencies of 2.4 GHz, 5.1 GHz, 6 GHz, 10 GHz, and 13.2 GHz are 2.08 dBi, 3.83 dBi, 5.16 dBi, 4.25 dBi, 3.3 dBi, and 5.43 dBi respectively.

[0017] (3) The antenna structure of the present invention is simple, easy to process, and has a low manufacturing cost. It has advantages such as high communication capacity and low-latency wireless communication, and has high practical value in mobile terminal applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention.

[0019] Figure 2 is a front schematic structural diagram of the present invention.

[0020] Figure 3 is a back schematic structural diagram of the present invention.

[0021] Figure 4 is a comparison diagram of the simulated and measured S11 parameters of the antenna of the present invention.

[0022] Figure 5 is a comparison diagram of the simulated and measured radiation patterns of the present invention at 2.4 GHz.

[0023] Figure 6 is a comparison diagram of the simulated and measured radiation patterns of the present invention at 5.1 GHz.

[0024] Figure 7 is a comparison diagram of the simulated and measured radiation patterns of the present invention at 6.0 GHz.

[0025] Figure 8 is a comparison diagram of the simulated and measured radiation patterns of the present invention at 10.0 GHz.

[0026] Figure 9 is a comparison diagram of the simulated and measured radiation patterns of the present invention at 13.2 GHz.

[0027] Figure 10 is the simulated gain diagram of the antenna of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will be further explained and illustrated below through specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should be aware that the present invention covers all alternative solutions, improvement solutions, and equivalent solutions that may be included within the scope of the claims.

[0029] Such as Figure 1As shown in the figure, a multi-band microstrip antenna for WiFi7 / Bluetooth / X-band includes a dielectric substrate 1. On the top of the dielectric substrate 1, there is an improved metal radiator 2 and a microstrip feeder 3. The radiator is formed by cutting a semi-circular groove 5, a rectangular groove 6, adding rectangular patches 7 and 8 on both sides, and subtracting the left and right right angles 9 and 10 at the lower part of the radiator, whose function is to increase the bandwidth of the antenna; a "U"-shaped groove 11 with an opening to the left is cut on the microstrip feeder 3, and there is an "L"-shaped metal patch 12 and 13 on each side of the feeder, whose function is to improve the matching of the antenna. The microstrip feeder is provided with a feeding point 14 for feeding; a rectangular ground plane 4 is arranged at the bottom of the dielectric substrate. The structure of the present invention is simple, has a small requirement for the antenna clearance area, and has a relatively high gain.

[0030] The improved metal radiator 2 is formed by 5-10. 5 is at the upper part of the radiator, 6 is directly below 5, 7 and 8 are on both sides of the radiator, and the long sides are placed horizontally; 9 and 10 are at the lower part of the radiator.

[0031] The "U"-shaped groove 11 is located in the middle and upper position of 3, with an opening to the left, and the added "L"-shaped metal patches 12 and 13 are located on both sides of 3.

[0032] In this embodiment, the length of the microstrip line 3 is 14.5 mm, the width is 2.9 mm, and it is located on the top of the dielectric substrate; the lengths of the "U"-shaped groove 11 are 1.2 mm and 3.8 mm respectively, and the width of the groove is 0.4 mm; the edge of the L-shaped metal patches 12 and 13 is 0.55 mm away from the feeder, the long side is 9 mm long and 1.1 mm wide; the short side is 6.1 mm long and 1 mm wide.

[0033] The radius of the semi-circular groove 5 is 6 mm, and the length of the rectangular groove is 12 mm and the width is 1 mm.

[0034] The added rectangular metal patches 7 and 8 have a length of 6 mm and a width of 0.5 mm; the left and right right angles 9 and 10 of the lower half of the radiator are cut, and the horizontal short side length of the cut triangle is 2.4 mm and the vertical long side length is 6.3 mm.

[0035] The ground plane is 42 mm long and 12.9 mm wide.

[0036] The antenna structure described in this embodiment is etched on the dielectric substrate 1. The material of the dielectric substrate is FR-4, the dielectric constant is 4.4, the height is 1.6 mm, and one side is tinned according to the structure of the microstrip line and the improved metal radiator; the other side is tinned according to the structure of the ground plane as an infinite large grounding plane.

[0037] The specific implementation is as follows:

[0038] This implementation uses printed circuit board etching technology to etch out Figure 2 the radiator and microstrip line structures on one side of a PCB board with a thickness of 1.6 mm. The size of the entire dielectric substrate is 46 mm × 42 mm × 1.6 mm, where the feeding point is not tinned. At the same time, this etching technology is also used to etch out Figure 3 the ground plane structure on the other side of an FR-4 substrate with a thickness of 1.6 mm.

[0039] The electromagnetic simulation software ANSYS Electronics Desktop 2019.2 is used to simulate this system. After the simulation and debugging are completed, physical production and testing are carried out. The results of the S parameters are shown in the appendix Figure 4 . It can be seen from it that both the simulation and test results can cover WiFi 7 / Bluetooth / 4G / 5G and C / X / Ku frequency bands. Since the designed antenna gain is between 1.74 - 5.43 dBi, omnidirectional coverage can be basically achieved at low frequencies; directional radiation can be achieved at high frequencies, meeting the requirements of wireless communication. It can be seen from the figure that some resonance points of the measured antenna have shifted because the processing technology and welding errors of the antenna have led to the shift of the resonance points.

[0040] As shown in the appendix Figure 5 , appendix Figure 6 and appendix Figure 7 , the comparison diagrams of the two-dimensional radiation patterns of the antenna obtained by simulation and measurement are shown. At low frequencies, it is basically omnidirectional radiation. It can be seen from the comparison diagrams of the two-dimensional radiation patterns shown in appendix Figure 8 and Figure 9 that the antenna has directional radiation at high frequencies. The reasons for the differences between the measurement and simulation may lie in the errors in physical production and the problems of manual measurement operations.

[0041] As shown in appendix Figure 10 , the simulation gain diagram of the antenna is given. The gain is between 1.74 - 5.43 dBi within the working frequency band, and the proposed antenna performance can be effectively applied to multi-band wireless communication.

Claims

1. A multi-band microstrip antenna for WiFi7 / Bluetooth / X-band, comprising a cuboid dielectric substrate, characterized in that, A metal floor is provided at the bottom of the dielectric substrate; an improved metal radiator and a microstrip feeder are provided at the top of the dielectric substrate; the improved metal radiator includes a semi-circular ring radiator and a rectangular radiator; the semi-circular ring radiator is obtained by cutting a semi-circular groove on a semi-circular radiator; the opening of the semi-circular ring radiator faces the rectangular radiator; a rectangular groove is cut at the end of the rectangular radiator facing the semi-circular ring radiator, and the diameter of the semi-circular groove is equal to the length of the rectangular groove; the length of the rectangular radiator is less than the outer diameter of the semi-circular ring radiator; the ends of the rectangular radiator facing the semi-circular ring radiator are respectively connected to the two ends of the semi-circular radiator; A rectangular metal is provided at the outer ends of both ends of the semi-circular ring radiator, and the left and right right angles of the lower half of the rectangular radiator are cut; the microstrip feeder is made of metal, a U-shaped groove is cut on the surface of the microstrip feeder, and an L-shaped metal is symmetrically arranged on both sides of the microstrip feeder, and a feeding point is provided in the microstrip feeder structure; The dielectric substrate is made of FR-4, with a length of 46 mm, a width of 42 mm, and a height of 1.6 mm; the side on which the improved metal radiator and the microstrip feeder are printed is the front side of the dielectric substrate, and the side on which the metal floor is printed is the back side of the dielectric substrate; The length of the microstrip feeder is 14.5 mm, and the width of the microstrip feeder is 2.9 mm; the U-shaped groove opens to the left, the lengths of the grooves are 1.2 mm and 3.8 mm respectively, and the widths of the grooves are both 0.4 mm; the edge of the L-shaped metal is 0.55 mm away from the microstrip feeder, the long side of the L-shaped metal is 9 mm long and 1.1 mm wide, the short side is 6.1 mm long and 1 mm wide; the radius of the semi-circular groove is 6 mm; the rectangular groove is located below the semi-circular groove, the length of the rectangular groove is 12 mm, and the width is 1 mm; the length of the rectangular metal is 6 mm, and the width is 0.5 mm; the left and right right angles of the lower half of the rectangular radiator are cut into triangles, and the horizontal short side length of the triangle is 2.4 mm, and the vertical long side length is 6.3 mm; the length of the metal floor is 42 mm, and the width is 12.9 mm.

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