Broadband high-gain circularly polarized microstrip antenna

Abstract

A broadband high-gain circularly polarized microstrip antenna comprises a floor, a feed coaxial, a bottom dielectric substrate, a chamfered U-shaped slot microstrip, a top dielectric substrate, a substrate integrated waveguide square cavity, and a 2*2 microstrip radiation unit. The substrate integrated waveguide square cavity is composed of a bottom square microstrip line, a metal cylinder array,a top square microstrip line, and a part of the top dielectric substrate surrounded by the metal cylinder array. The respective parts of the antenna are stacked in order from bottom to top. The antenna can be achieved by a common double-layer microstrip printed board process or by an LTCC process. The method uses a form that a single-point feeding lower microstrip excites the upper 2*2 microstripradiation unit through the substrate integrated waveguide square cavity, increases the gain while realizing a wide frequency band, thereby avoiding the use of a complicated feed network. The circularpolarization of the antenna is achieved by means of chamfering on two rectangular microstrips. The antenna can be used as a single antenna or as a wide-angle scanning array antenna element.

Description

technical field [0001] The invention belongs to the technical field of microstrip antennas, in particular to a wide-band, high-gain, circularly polarized microstrip antenna. Background technique [0002] Microstrip antenna has the advantages of low profile, low cost, light weight, simple structure, easy conformality, and easy integration, and is a common antenna form in electronic systems. Circularly polarized microstrip antennas have strong anti-rain and fog interference and anti-multipath reflection capabilities, so they are widely used in communication, radar and navigation systems. [0003] With the development of technologies such as broadband communication and high-resolution imaging, various communication and imaging systems have more and more demands for low-cost, wide-band, circularly polarized, high-gain antennas suitable for wide-angle scanning. Common broadband circularly polarized microstrip antennas generally use double-layer (or multi-layer) multi-feed point ...

AI Technical Summary

Problems solved by technology

Common broadband circularly polarized microstrip antennas generally use double-layer (or multi-layer) multi-feed point excitation. The double-layer (or multi-layer) microstrip structure reduces the isolation of the antenna as an array unit, while multi-fed The complex feed network that needs to be used not only increases the size of the antenna, increases the processing complexity, but also increases the antenna feed loss

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