CN211045716U

CN211045716U - K-band high-gain metamaterial-coated microstrip antenna

Info

Publication number: CN211045716U
Application number: CN201920890498.1U
Authority: CN
Inventors: 董焱章; 周精浩; 林鉴岳; 王峰
Original assignee: Hubei University of Automotive Technology
Current assignee: Hubei University of Automotive Technology
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-07-17
Anticipated expiration: 2029-06-13

Abstract

The utility model discloses a K wave band high gain metamaterial coating type microstrip antenna, including the antenna substrate, the lower surface of antenna substrate is provided with the metal ground plate, and the upper surface middle part is provided with the microstrip paster, is provided with coaxial line feed probe on the microstrip paster, and the top parallel arrangement of antenna substrate has antenna coating base plate, through the pillar connection between antenna substrate and the antenna coating base plate, and the last sculpture a plurality of metamaterial unit element of antenna coating base plate, the metamaterial unit are array arrangement structure. The utility model discloses an introducing metamaterial antenna coating, having overcome traditional microstrip antenna gain low, the structure is complicated, and the big problem of specification has simple structure, and preparation is convenient, advantage that the gain is high.

Description

K-band high-gain metamaterial-coated microstrip antenna

Technical Field

The utility model relates to a communication antenna technical field specifically indicates a K wave band high-gain metamaterial coating type microstrip antenna.

Background

The microstrip antenna has the advantages of small volume, simple structure, low cost, easy conformation with other electromagnetic devices and the like, but the traditional microstrip antenna has the defects of relatively low gain, large influence of performance by a dielectric plate material, easy excitation of surface waves, energy loss, low power capacity, narrow frequency band, poor isolation between feed and radiation elements, poor directivity and the like, and is restricted by further development and application of the microstrip antenna. In order to improve the gain performance of the microstrip antenna, researchers have proposed improved methods such as using a low dielectric constant dielectric slab, adding a parasitic patch and an antenna array, but these methods have the problems of large size, complex structure, increased cost and the like while improving the gain performance of the antenna. With the emergence of electromagnetic metamaterials, a new idea is provided for improving the gain performance of the microstrip antenna.

Disclosure of Invention

An object of the utility model is to overcome prior art not enough, provide a K wave band high gain metamaterial coating type microstrip antenna, compact structure, preparation is simple, through the supernormal physical property promotion antenna gain of metamaterial.

In order to realize the above-mentioned purpose, the utility model discloses a K wave band high gain metamaterial coating type microstrip antenna, including the antenna substrate, its special character lies in, the lower surface of antenna substrate is provided with the metal ground plate, and the upper surface middle part is provided with the microstrip paster, be provided with coaxial line feed probe on the microstrip paster, the top parallel arrangement of antenna substrate has the antenna coating base plate, through the pillar connection between antenna substrate and the antenna coating base plate, a plurality of metamaterial elementary elements of sculpture on the antenna coating base plate, the metamaterial elementary elements are array configuration structure.

Further, the metamaterial unit cell is of a square or rectangular structure.

Furthermore, each metamaterial unit is formed by arranging and combining a plurality of square copper sheets, and a redundant area is arranged between every two adjacent copper patches so as to eliminate point contact of the copper patches. The width of the redundant area is 0.01-0.1 mm.

Furthermore, the distance between the metamaterial element and the microstrip antenna substrate is 6.25 mm.

Furthermore, the support posts are circular columns arranged at four corners of the antenna substrate.

Furthermore, the metamaterial elements are arranged on the antenna cladding substrate in a square or rectangular array.

Further, the antenna cover substrate is a square or rectangular epoxy resin plate.

Further, the coaxial line feed probe has an operating frequency of 24 GHz.

Furthermore, gaps are arranged between the metamaterial elements and the edges of the antenna coating substrate, and gaps are arranged among the metamaterial elements.

Compared with the prior art, the utility model discloses an introduce metamaterial antenna coating, it is low to have overcome traditional microstrip antenna gain, and the structure is complicated, and the problem that the specification is big has simple structure, and preparation is convenient, advantage that the gain is high.

Drawings

FIG. 1 is a schematic structural diagram of the present invention

FIG. 2 is a schematic diagram of the metamaterial antenna cladding of FIG. 1

FIG. 3 is a schematic diagram of the microstrip antenna shown in FIG. 1

FIG. 4 is a schematic top view of FIG. 2

FIG. 5 is a schematic diagram of the metamaterial unit structure in FIG. 2

In the figure: the antenna comprises an antenna substrate 1, a microstrip patch 2, a coaxial feed device 3, a metal ground plate 4, an antenna coating substrate 5, metamaterial elements 6 and a strut 7.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in fig. 1-5, the utility model provides a K-band high-gain metamaterial coating type microstrip antenna, it includes antenna substrate 1, microstrip paster 2, coaxial line feed probe 3, metal ground plate 4, antenna coating substrate 5, metamaterial unit 6 and pillar 7.

The lower surface of the antenna substrate 1 is provided with a metal ground plate 4, the middle part of the upper surface is provided with a microstrip patch 2, the microstrip patch 2 is provided with a coaxial line feed probe 3, and an antenna coating substrate 5 is arranged above the antenna substrate 1 in parallel. The antenna substrate 1 is connected with the antenna coating substrate 5 through the support 7, a plurality of metamaterial elements 6 are etched on the antenna coating substrate 5, and the metamaterial elements 6 are in an array arrangement structure.

The antenna substrate 1 is a polyethylene plate with 14 × 1mm, the insulating property is good, and the lower dielectric constant is beneficial to increasing the bandwidth of the antenna. The thickness of the antenna substrate 1 is less than one fifth of the operating wavelength of the antenna, here taken to be 1 mm. The microstrip patch 2 is a metal radiation patch with a copper coating, the length and the width of the microstrip patch 2 are 4.029mm and 3.4714mm respectively, the specification is small, and the miniaturization of the antenna is easy to realize. The feeder 3 is coaxial line feeding and has an operating frequency of 24GHz in the K-band. The coaxial feed 3 is located at the center of the antenna and is offset towards the width direction of the microstrip patch 2 by 1.2523 mm. The metal ground plate 5 is a copper coating, the antenna coating substrate 5 is made of epoxy resin FR4, and the metamaterial element 6 is an element with the thickness of 0.017mm, so that the antenna is thin in thickness, small in specification, small in occupied space and low in cost. The metamaterial element 6 is formed by arranging and combining 0.26 × 0.017mm square copper sheets, 0.05mm redundant overlapping areas are arranged between the adjacent copper sheets, and the arrangement and combination form of the square copper sheets is determined by an algorithm. The pillars 7 are made of polyethylene and are disposed at four corners of the antenna substrate 1. Four corners of the metamaterial element 6 are right angles, and the metamaterial element 6 has no chamfer, circular arc curved surface or curve structure, and has better compactness when being combined with the metamaterial element 6 without chamfer, circular arc curved surface or curve structure. The individual metamaterial elements 6 are 2.1mm long and wide and are discretized into squares of 0.26mm long and wide, and the arrangement of the squares is determined by genetic algorithms. Sixteen sets of metamaterial elements 6 are etched in a 4 x 4 array on the antenna cover substrate 5 and together with the antenna cover substrate 5 act as a metamaterial antenna cover. The area of the antenna cladding substrate 5 can be increased to arrange more metamaterial elements 6, and epoxy resin FR4 with the same size as the antenna substrate is used as the antenna cladding substrate 5, so that the antenna cladding substrate is small in size, simple in structure, realized by a circuit board etching technology, and low in cost. When the metamaterial elements 6 are arranged on the antenna coating substrate 5, 2mm of design space is reserved at the edge, and the transverse and longitudinal arrangement intervals of the elements are both 0.467 mm. The antenna coating substrate 5 is made of epoxy resin FR4 with the thickness of 14 x 1mm, and has high mechanical property and dielectric property, good heat resistance and moisture resistance and good machinability. The metamaterial antenna cladding is placed over the coaxial feed probe 3 by a post 7. The pillar 7 is a cylinder with the diameter of 1mm and the length of 5.25mm, is made of polyethylene, has good insulation property and has small influence on a metal coating of the antenna. The upper end of the coaxial feed device 3 is connected with the microstrip radiation patch 2, and the lower end is connected with the metal grounding plate 4 connected with the antenna substrate 1. The length and width of the metal grounding plate 4 are 10 x 10mm, namely, a copper coating is etched on the back surface of the whole substrate, the coating material is copper, and the thickness is 0.35 mm. The utility model discloses an adopt microstrip paster 2, coaxial feeder 3, metal ground plate 4, antenna coating base plate 5, elementary 6 and pillar 7 intercombination of antenna substrate 1, metal radiation to constitute microstrip antenna, regard as the metamaterial antenna coating together on base plate 5 through the 6 sculpture of sixteen groups of elementary to place in antenna top 5.25mm department, overall structure is compact, and occupation space is little, and antenna gain is obvious, and is with low costs.

Finally, it should be noted that the above detailed description is only for illustrating the technical solution of the patent and not for limiting, although the patent is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the patent can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the patent, which should be covered by the claims of the patent.

Claims

1. The utility model provides a K wave band high gain metamaterial coating type microstrip antenna, includes antenna substrate (1), its characterized in that: the antenna comprises an antenna substrate (1), and is characterized in that a metal ground plate (4) is arranged on the lower surface of the antenna substrate (1), a microstrip patch (2) is arranged in the middle of the upper surface of the antenna substrate, a coaxial line feed probe (3) is arranged on the microstrip patch (2), an antenna coating substrate (5) is arranged above the antenna substrate (1) in parallel, the antenna substrate (1) and the antenna coating substrate (5) are connected through a strut (7), a plurality of metamaterial elements (6) are etched on the antenna coating substrate (5), and the metamaterial elements (6) are in an array arrangement structure.

2. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: the metamaterial unit (6) is of a square or rectangular structure.

3. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: each metamaterial unit (6) is formed by arranging and combining a plurality of square copper sheets, and a redundant area is arranged between every two adjacent copper patches.

4. The K-band high-gain metamaterial clad microstrip antenna of claim 3 wherein: the width of the redundant area is 0.01-0.1 mm.

5. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: the distance between the metamaterial element (6) and the microstrip antenna substrate (1) is 6.25 mm.

6. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: the supporting columns (7) are circular columns arranged at four corners of the antenna substrate (1).

7. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: the metamaterial elements (6) are arranged on the antenna coating substrate (5) in a square or rectangular array.

8. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: the antenna coating substrate (5) is a square or rectangular epoxy resin plate.

9. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: the working frequency of the coaxial line feed probe (3) is 24 GHz.

10. The K-band high-gain metamaterial clad microstrip antenna of claim 1 wherein: gaps are arranged between the metamaterial elements (6) on the antenna coating substrate (5) and the edges, and gaps are arranged between the metamaterial elements (6).