Double-reflecting surface antenna with special shape guided wave dielectric rod feeding

Abstract

The invention discloses a double-reflecting surface antenna with a special shape guided wave dielectric rod feeding. The antenna includes a circular waveguide, a guided-wave dielectric rod, a taperedsecondary reflecting surface, a parabolic reflecting surface, and a metal ring, wherein the guided-wave dielectric rod is located between the tapered secondary reflecting surface and the circular waveguide, the guided-wave dielectric rod is inserted to the inner cavity of the circular waveguide, the guided-wave dielectric rod located in the inner cavity portion of the circular waveguide is dividedinto a plurality of coaxial circular tables, and the radius of the circular tables decreases progressively in a direction from the tapered secondary reflecting surface to the parabolic reflecting surface; the circular waveguide is located at the center of the main reflecting surface, the axis of the circular waveguide and the diameter of the antenna point to the same direction, and a microwave signal is introduced by the circular waveguide, sent to the tapered secondary reflecting surface by the guided-wave dielectric rod and reflected to the parabolic reflecting surface, and finally emittedby the parabolic reflecting surface in parallel. The invention effectively improves the reflection coefficient S11 of the double-reflecting surface antenna, is capable of effectively suppressing the cross polarization, reducing the ohmic loss, reducing the sidelobe level, and improving the radiation efficiency, and is symmetrical in structure, compact and simple, and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a dual-reflection-surface antenna fed by a special-shaped waveguide dielectric rod. Background technique [0002] Dual-reflector antennas have been the focus of research in many practical applications, such as satellite communications, radio frequency telescopes, microwave transmission and remote sensing systems. The shape of the reflective surface has four typical forms: paraboloid, ellipse, cylinder, and sphere. Paraboloid is the most common reflective surface structure, in which the main focus and complementary focus are the main feeding positions: [0003] Complementary focus parabolic reflector antenna has many advantages, such as high isolation between antenna and feed, low sidelobe, but this structure also has its disadvantages: high cross-plan and beam tilt; [0004] The main focus parabolic reflector antenna has more advantages: cheap, high performance, easy maintenan...

AI Technical Summary

Problems solved by technology

[0003] Complementary focus parabolic reflector antenna has many advantages, such as high isolation between antenna and feed, low sidelobe, but this structure also has its disadvantages: high cross-plan and beam tilt;

[0004] The main focus parabolic reflector antenna has more advantages: cheap, high performance, easy maintenance and easy assembly, however, this symmetrical structure will seriously affect the side lobe level and cross polarization of high order modes, thus reducing the efficiency of the antenna

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