CN210468115U

CN210468115U - Rectangular slotted high-gain microstrip antenna fed by coplanar waveguide

Info

Publication number: CN210468115U
Application number: CN201922012370.8U
Authority: CN
Inventors: 马春雨; 张丹; 秦润莲; 王鑫钰; 白洋
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-05-05
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a rectangle of coplane waveguide feed digs groove high gain microstrip antenna belongs to antenna technical field. The dielectric substrate comprises a dielectric substrate, wherein the surface of the dielectric substrate covers a coplanar waveguide grounding surface, a gap is formed in the coplanar waveguide grounding surface on the upper surface of the dielectric substrate, a radiation patch is arranged on the surface of the dielectric substrate in the gap, a gap is formed in the radiation patch, and the radiation patch is connected with the edge of the dielectric substrate through a microstrip transmission line. The utility model discloses a microstrip antenna can realize the omnidirectional radiation to the gain reaches 4.16dBi, and its return loss, standing wave and direction performance all reach fine effect.

Description

Rectangular slotted high-gain microstrip antenna fed by coplanar waveguide

Technical Field

The utility model belongs to the technical field of the antenna, specifically speaking relates to a rectangle of coplane waveguide feed digs groove high gain microstrip antenna.

Background

The main body of the microstrip antenna is a dielectric substrate with the thickness far smaller than the working wavelength, one surface of the substrate is attached with a metal radiating sheet, and the other surface of the substrate is completely coated with a metal thin layer to be used as a grounding plate. A central conductor strip is produced on one face of a dielectric substrate and conductor planes are produced on both sides of the immediate vicinity of the central conductor strip, thus forming a coplanar waveguide, also called a coplanar microstrip transmission line. Coplanar waveguides propagate TEM waves without a cut-off frequency. Because the central conductor strip and the conductor plane are positioned in the same plane, it is convenient to install components on the coplanar waveguide in parallel, and a monolithic microwave integrated circuit with the transmission line and the components on the same side can be manufactured by using the coplanar waveguide.

The dielectric substrate is usually made of insulating material, and the metal radiating plate and the ground plate are made of metal. In the design, the radiation sheet can be designed into different shapes according to different requirements according to different environments, working frequencies and application technologies. The coplanar waveguide has the advantages of small volume, light weight and planar structure, so that the coplanar waveguide is convenient for obtaining linear polarization, circular polarization, dual polarization, multi-band operation and the like, and the advantages enable the coplanar waveguide to be widely applied to modern wireless communication.

Disclosure of Invention

To the above-mentioned problem that prior art exists, the utility model aims to provide a rectangle of coplane waveguide feed digs groove high gain microstrip antenna has designed the rectangle radiation paster and has surrounded the coplane waveguide sheetmetal that covers the substrate surface of radiation paster, has reached the effect of omnidirectional radiation to the gain is higher.

In order to solve the above problems, the utility model adopts the following technical proposal.

A coplanar waveguide fed rectangular groove high-gain microstrip antenna comprises a dielectric substrate, wherein the surface of the dielectric substrate covers a coplanar waveguide grounding surface, a gap is formed in the coplanar waveguide grounding surface on the upper surface of the dielectric substrate, a radiation patch is arranged on the surface of the dielectric substrate in the gap, a gap is formed in the radiation patch, and the radiation patch is connected with the edge of the dielectric substrate through a microstrip transmission line.

The upper surface of the medium substrate is square, the vacancy is circular, the radiation patch is square, and the gap is rectangular.

The void is located in the center of the coplanar waveguide ground plane.

The radiation patches are bilaterally symmetrical by taking the vertical symmetrical line of the medium substrate as a symmetrical axis.

The slit is arranged at the left position of the center of the radiation patch, and the slit is vertically symmetrical by taking the transverse symmetrical line of the radiation patch as a symmetrical axis.

The gap is rectangular, and one long edge of the gap is coincided with the vertical symmetrical line of the medium substrate.

The symmetrical line of the microstrip transmission line is superposed with the vertical symmetrical line of the radiation patch.

The material of the dielectric substrate is Rogers 5880.

The coplanar waveguide ground plane and the radiation patch are made of copper.

Compared with the prior art, the beneficial effects of the utility model are that through loading coplanar waveguide, opening the design in rectangular gap, the omnidirectional radiation can be realized to the antenna to the gain reaches 4.16dBi, and its return loss, standing wave and directional performance all reach fine effect.

Drawings

Fig. 1 is a schematic structural diagram of a microstrip antenna of the present invention;

fig. 2 is a schematic plan view of the microstrip antenna of the present invention;

in FIGS. 1 to 2: 1. a dielectric substrate; 2. a coplanar waveguide ground plane; 3. a radiation patch; 4. a gap; 5. a microstrip transmission line; 6. vacant;

FIG. 3 is a simulation diagram of return loss of the microstrip antenna of the present invention;

FIG. 4 is a simulation diagram of the standing wave of the microstrip antenna of the present invention;

fig. 5 is a simulation diagram of the gain directions of the E-plane and the H-plane of the microstrip antenna of the present invention;

fig. 6 is a simulation diagram of the three-dimensional E-plane gain direction of the microstrip antenna of the present invention.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

The rectangular slotted high-gain microstrip antenna fed by coplanar waveguide of the present invention shown in fig. 1 comprises a dielectric substrate 1, and a coplanar waveguide ground plane 2 is covered on all the surfaces except for a circular gap 6 left at the center of the upper surface of the dielectric substrate 1. As shown in fig. 2, a radiation patch 3 covers the surface of the dielectric substrate 1 in the circular gap 6, and the radiation patch 3 is connected with a microstrip transmission line 5 by adopting a side feed and center feed feeding mode, and the microstrip transmission line 5 connects the radiation patch 3 with the edge of the dielectric substrate 1. A rectangular slit 4 is provided at a position to the left of the center of the radiation patch 3, that is, a rectangular through hole is dug at the position of the radiation patch 3.

The radiation patches 3 are rectangular and are bilaterally symmetrical by taking the vertical symmetrical line of the dielectric substrate 1 as a symmetrical axis.

The rectangular slot 4 is vertically symmetrical with the transverse symmetrical line of the radiation patch 3 as a symmetrical axis, and the longer side of the right side of the rectangular slot 4 is superposed with the symmetrical line of the dielectric substrate 1.

Examples

In this embodiment, the dielectric substrate 1 is a Rogers5880 plate with a relative dielectric constant of 2.2. The radiation patch 3 and the coplanar waveguide ground plane 2 are made of copper materials, and the port of the microstrip transmission line 5 is fed by a coaxial line of 50 ohms.

The upper surface and the lower surface of the dielectric substrate 1 are squares with the side length of 28mm and the height of 1.6 mm; the circle center of the circular vacancy 6 of the coplanar waveguide grounding surface 2 is positioned at the center point of the upper surface of the dielectric substrate 1, and the radius of the circular vacancy is 11 mm; the radiation patch 3 is a square with the side length of 14mm, and the vertical distance between the upper end of the radiation patch and the upper end of the dielectric substrate 1 is 8 mm; the length of the rectangular gap 4 is 6mm, and the width of the rectangular gap is 1 mm; the width of the microstrip transmission line 5 is 3.6mm, the microstrip transmission line 5 is symmetrical left and right by taking a vertical symmetrical line of the dielectric substrate 1 as a symmetrical axis, and the distance from the microstrip transmission line 5 to the coplanar waveguide grounding surface is 1 mm.

The microstrip antenna is welded with the SMA joint for testing, the microstrip antenna is excited in a side feed mode only under the condition of main mode excitation, the input impedance is set to be 50 ohms, the central frequency is designed to be 5.8GHz, the design and optimization are carried out through HFSS software, meanwhile, the scanning frequency is added from 4 GHz to 8GHz, the performance of the antenna is inspected, the return loss, the voltage standing wave ratio and the gain of the antenna in the frequency band are analyzed, and the result is shown in figures 3-6.

Fig. 3 shows a Return Loss (Return Loss) diagram, the Return Loss of the antenna is lower than-10 dB in the frequency band of 5.3-6.5GHz, and reaches-45 dB in the frequency band of 5.8GHz, which indicates that the antenna can work in the frequency band of 5.3-6.5GHz and can be practically applied to WLAN. Fig. 4 shows the standing wave ratio (VSWR), which is lower than 2 in the 5.3-6.5GHz band and reaches 1 at the lowest in the 5.8GHz band, indicating that the antenna has a good impedance match in the 5.3-6.5GHz band. Fig. 5 shows an E, H planar gain diagram, with an antenna gain of 4.16dBi at 0 ° and 180 °, indicating high antenna gain and good radiation performance. Fig. 6 shows a three-dimensional gain diagram illustrating that the antenna achieves omni-directional radiation.

Claims

1. The rectangular groove-digging high-gain microstrip antenna with coplanar waveguide feed comprises a dielectric substrate (1) and is characterized in that the surface of the dielectric substrate (1) covers a coplanar waveguide ground plane (2), a gap (6) is formed in the coplanar waveguide ground plane (2) on the upper surface of the dielectric substrate (1), a radiation patch (3) is arranged on the surface of the dielectric substrate (1) in the gap (6), a gap (4) is formed in the radiation patch (3), and the radiation patch (3) is connected with the edge of the dielectric substrate (1) through a microstrip transmission line (5).

2. The rectangular slotted high-gain microstrip antenna fed by coplanar waveguide according to claim 1, wherein the upper surface of the dielectric substrate (1) is square, the gap (6) is circular, the radiating patch (3) is square, and the slot (4) is rectangular.

3. -rectangular slotted high-gain microstrip antenna fed by a coplanar waveguide according to claim 1 or 2, characterized in that said void (6) is located in the centre of said coplanar waveguide ground plane (2).

4. The rectangular slotted high-gain microstrip antenna fed by coplanar waveguide according to claim 1 or 2, characterized in that the radiating patches (3) are left-right symmetric with respect to the symmetry line of the dielectric substrate (1) in the vertical direction.

5. The rectangular slotted high-gain microstrip antenna fed by coplanar waveguide according to claim 1 or 2, wherein the slot (4) is disposed at the left position of the center of the radiating patch (3), and the slot (4) is vertically symmetrical with respect to the symmetry axis of the radiating patch (3) which is the transverse symmetry line.

6. The rectangular slotted high-gain microstrip antenna fed by coplanar waveguide according to claim 5, wherein the slot (4) is rectangular, and one long side of the slot (4) coincides with the vertical line of symmetry of the dielectric substrate (1).

7. The rectangular slotted high-gain microstrip antenna fed by coplanar waveguides according to claim 1, characterized in that the line of symmetry of the microstrip transmission line (5) coincides with the line of symmetry of the vertical of the radiating patch (3).

8. The rectangular slotted high-gain microstrip antenna with coplanar waveguide feed according to claim 1, wherein the dielectric substrate (1) is made of Rogers 5880.

9. The rectangular slotted high-gain microstrip antenna fed by coplanar waveguide according to claim 1, wherein the coplanar waveguide ground plane (2) and the radiating patch (3) are made of copper.