CN111613874B

CN111613874B - Three-mode OAM antenna based on triangular half module

Info

Publication number: CN111613874B
Application number: CN202010368025.2A
Authority: CN
Inventors: 胡俊; 胡燕金; 吴文; 赵润哲; 杨景
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2022-11-04
Anticipated expiration: 2040-04-30
Also published as: CN111613874A

Abstract

The invention discloses a triangular half-mode-based three-mode OAM antenna, which is an OAM antenna combining a half-mode resonant mode of a high-order mode on the basis of a uniform rotation array, wherein the high-order mode is originated from a rectangular cavity of SIW, and the triangular half-mode is formed by cutting the cavity along a diagonal line; the invention mainly comprises four isosceles right triangle metalized patch units positioned on a dielectric substrate and metalized grid-shaped through holes at the edges of the units, wherein the uniformly distributed metalized grids are a key technology similar to an ideal conductor wall in the substrate integrated waveguide technology, and the metalized grid-shaped through holes are positioned at the edges of two sides of each triangular unit; the feed mode of the invention adopts independent coaxial probes for the four cavities. The invention has the characteristics of better compactness and planar integration, and simultaneously has high broadband and in-band isolation.

Description

Three-mode OAM antenna based on triangular half module

Technical Field

The invention relates to the technical field of microwaves, in particular to a triangular half-mode-based three-mode OAM antenna.

Background

Orbital Angular Momentum (OAM) is used as a new modulation mode in a radio communication system, and a communication technology based on OAM multiplexing can realize parallel transmission of multi-channel vortex electromagnetic waves carrying information in the same bandwidth, thereby greatly improving the utilization rate of frequency spectrum.

A Uniform Rotation Array (URA) antenna is a method for generating OAM, and vortex electromagnetic waves of different OAM modes can be realized by changing the phase difference of feeding between array elements.

The traditional cavity antenna has the characteristics of large volume, complex structure, high cost, difficulty in integration and the like, and along with the rapid development and application of modern communication technology, the requirements on the miniaturization, integration and performance of a communication system are gradually increased.

The substrate integrated waveguide is a waveguide structure which is researched more in engineering in recent years, has the advantages of the traditional metal waveguide and a planar circuit, and has the advantages of low cost, light weight, easiness in integration and the like. The half-mode substrate integrated waveguide technology of a high-order mode is used in the resonant cavity, so that the area can be effectively reduced, and the circuit design is very compact.

Disclosure of Invention

The invention aims to provide a triangular half-mode-based three-mode OAM antenna, which is combined with a uniform rotation array to realize a three-mode OAM transmitting antenna with better performance.

The technical scheme for realizing the purpose of the invention is as follows: a three-mode OAM antenna based on triangular half-molds comprises a dielectric substrate, a ground metal layer, four half-mold SIW triangular patches and a metalized grid-shaped through hole; the four half-mode SIW triangular patches are isosceles right-angle triangular patches and are positioned on the upper surface of the medium substrate; the grounding metal layer is positioned on the lower surface of the dielectric substrate; the metalized grid-shaped through holes are embedded among the medium substrate, the grounding metal layer and the four half-mold SIW triangular patches and distributed at the edges of two waists of the four half-mold SIW triangular patches to form a metal wall.

Compared with the prior art, the invention has the following remarkable advantages: the method has the characteristics of better compactness and planar integration, and can realize higher bandwidth and in-band isolation.

Drawings

FIG. 1 is a design flow chart of the present invention.

Fig. 2 is a three-dimensional view of the present invention.

Fig. 3 is a top, bottom and front view of the present invention.

Fig. 4 is a phase diagram of each mode of the OAM antenna.

Detailed Description

A three-mode OAM antenna based on triangular half-molds comprises a dielectric substrate, a ground metal layer, four half-mold SIW triangular patches and a metalized grid-shaped through hole;

the four half-mode SIW triangular patches are isosceles right-angle triangular patches and are positioned on the upper surface of the medium substrate;

the grounding metal layer is positioned on the lower surface of the dielectric substrate;

the metalized grid-shaped through holes are embedded among the medium substrate, the grounding metal layer and the four half-mold SIW triangular patches and distributed at the edges of two waists of the four half-mold SIW triangular patches to form a metal wall.

Furthermore, the half-mold SIW triangular patch is obtained by cutting a SIW rectangular resonant cavity along a diagonal line.

Further, the four half-mold SIW triangular patches form four cavity units by uniformly rotating the array.

Furthermore, the four cavity units adopt a separated structure, the distance between every two adjacent cavity units is one-seventh wavelength, cavities of the four cavity units adopt independent coaxial feed, adjacent feed probes are separated by 90-degree central angles, and OAM vortex waves of different modes are realized by feeding constant-amplitude signals with different phase differences.

Furthermore, the metalized grid-shaped through holes are cross grooves and are uniformly distributed.

Furthermore, the diameter of the metal grid-shaped through hole is larger than one half of the space between the metal grid-shaped through holes.

Furthermore, the dielectric substrate is a 3mm F4BMX350 single-layer dielectric plate, and the dielectric constant of the substrate is 3.5.

Furthermore, the diameter of each metalized grid-shaped through hole is 0.5mm, and the distance between the metalized grid-shaped through holes is 0.8mm.

Examples

As shown in fig. 1, 2 and 3, the present embodiment provides an antenna for implementing a vortex electromagnetic wave of multiple OAM modes. The antenna is a three-mode OAM transmitting antenna based on a TM110 mode triangular half-mode of a substrate integrated waveguide rectangular cavity, the antenna is composed of four triangular patches positioned on the upper surface, a medium substrate of a middle layer and a grounding metal layer on the lower surface, two rows of metalized through holes are arranged on two sides of the waist of each triangular patch unit, and the metal through holes are embedded among the three to form four semi-closed triangular cavities separated by cross grooves. The feeding adopts coaxial feeding, the feeding is respectively carried out in the four resonant cavities, the feeding port is arranged below the lower layer metal substrate, the control of an OAM mode is realized by changing the phase difference between feeding points, and the OAM mode is shown in figure 4.

According to the invention, the SIW rectangular cavity is cut along a diagonal line to form a semi-closed triangular half-mode SIW cavity, then four cavity units are formed by combining uniformly selected rotating arrays, and the OAM mode is controlled by controlling the phase difference of each feed point in each unit.

The antenna can realize 3 different OAM modal vortex waves, when the phase difference of the four feeding probes is zero, vortex waves with a mode of 0 are generated, when the phase difference of the four feeding probes along the clockwise direction is 90 degrees, vortex waves with a mode of +1 are generated, and when the phase difference of the four feeding probes along the clockwise direction is-90 degrees, vortex waves with a mode of-1 are generated.

The embodiment is realized on a F4BMX350 single-layer dielectric plate with the thickness of 3mm, and the dielectric constant of the substrate is 3.5; the diameter of each metallized through hole is 0.5mm, and the distance between every two metallized through holes is 0.8mm; the distance between adjacent triangular cavities is 6mm, and the side length of each triangle is 16.2mm; the feed electricity is positioned on the height of the isosceles triangle, and the distance from the feed center to the two sides is 5.5mm; to match the SMA50 ohm feed, the underlying metal substrate used a thickness of 3 mm.

The Active S parameter analysis contains all coupling influences and has higher analysis value. This defined return loss is a practically valid S-parameter, taking into account the coupling effects from other ports in addition to the return loss of the cell. The embodiment of the invention has better Active S parameters.

While the invention has been explained in terms of the above embodiments, it is not intended that the scope of the invention be limited thereto, and that the above constructions may be substituted with similar or equivalent elements as those skilled in the art without departing from the spirit of the invention.

Claims

1. A three-mode OAM antenna based on a triangular half-mold is characterized by comprising a dielectric substrate, a ground metal layer, four half-mold SIW triangular patches and a metalized grid-shaped through hole;

the four half-mold SIW triangular patches are isosceles right triangle patches and are positioned on the upper surface of the medium substrate;

the metalized grid-shaped through holes are embedded among the medium substrate, the grounding metal layer and the four half-mold SIW triangular patches and distributed at the edges of two waists of the four half-mold SIW triangular patches to form a metal wall;

the four half-die SIW triangular patches form four cavity units through uniform rotation array;

the four cavity units adopt a separated structure, the distance between every two adjacent cavity units is one-seventh wavelength, the cavities of the four cavity units adopt independent coaxial feed, adjacent feed probes are separated by a central angle of 90 degrees, and OAM vortex waves of different modes are realized by feeding constant-amplitude signals with different phase differences;

the metalized grid-shaped through holes are cross grooves and are uniformly distributed.

2. The triangular half-mold based triple-mode OAM antenna of claim 1, wherein the half-mold SIW triangular patch is obtained by diagonally cutting a SIW rectangular cavity.

3. The triangular-half-mold-based tri-modal OAM antenna as claimed in claim 1, wherein the diameter of the metalized grating via is greater than one-half of the metalized grating via pitch.

4. The triangular mold half-based triple-mode OAM antenna as recited in claim 1, wherein said dielectric substrate is a 3mm F4BMX350 single layer dielectric slab having a dielectric constant of 3.5.

5. The tri-modal OAM antenna based on a triangular half-mold of claim 1, wherein the metalized grated vias have a diameter of 0.5mm and the spacing between metalized grated vias is 0.8mm.