A novel circularly polarized millimeter-wave broadband planar reflectarray antenna with feedforward excitation and multi-frequency points

Abstract

The invention relates to a novel circularly polarized millimeter-wave broadband planar reflective array antenna with multi-frequency points for feedforward excitation, and belongs to the field of microwave technology. It includes a dielectric substrate, a ground plane, a feed source, and a microstrip n*n petal reflection array; the microstrip n*n petal reflection array includes n*n single-layer tightly coupled petal units, and n*n single-layer tightly coupled petal units The units meet the recursive relationship and are evenly arranged on the upper surface of the dielectric substrate and are distributed at a certain angle. The microstrip n*n petal reflector array faces the feed source; each tightly coupled petal unit is a circle containing 2*M pairs of equal sizes. Regular polygon split resonant rings with regular 2*M polygon gaps, and regular polygon split resonant rings of different sizes work at different frequencies respectively to form a multi-resonant unit; a ground plate is provided on the back of the dielectric substrate, and the outline of the ground plate is rectangular. Capable of working in different millimeter wave bands including 5G specifications, designed on demand, has good radiation performance, simple structure, low cost, and easy engineering implementation.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a novel circularly polarized millimeter-wave broadband planar reflection array antenna with forward-feed excitation and multi-frequency points. Background technique [0002] Traditional high-gain antennas mainly include reflector antennas represented by large parabolic antennas and microstrip patch array antennas represented by phased array antennas. Large-scale reflector antennas are simple in design, theoretically infinite in gain bandwidth, and have high efficiency and strong directivity, but they are bulky and difficult to deploy, requiring a complex servo system. The curved surface structure requires high processing accuracy, especially in the millimeter wave band. , beam scanning can only be achieved by mechanical rotation is also a disadvantage. Microstrip patch array antennas often have a low profile, and PCB etching technology is mature. The phase and amp...

AI Technical Summary

Problems solved by technology

Large-scale reflector antennas are simple in design, theoretically infinite in gain bandwidth, and have high efficiency and strong directivity, but they are bulky and difficult to deploy, requiring a complex servo system. The curved surface structure requires high processing accuracy, especially in the millimeter wave band. , beam scanning can only be achieved by mechanical rotation is also a disadvantage

Microstrip patch array antennas often have a low profile, and PCB etching technology is mature. The phase and amplitude of the radiating element can be adjusted independently by phase shifting, and it is easy to realize beam scanning. However, for ultra-large-scale arrays, the design of the feed network is complicated. The cost of T / R components required for electronic scanning is high, and the loss of the millimeter wave band increases sharply

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