Miniaturized single feed point dual-frequency and dual-polarization microstrip antenna

Abstract

The invention relates to a miniaturized single feed point dual-frequency and dual-polarization microstrip antenna. The upper surface of a substrate base plate is provided with a first radiation patch and a second radiation patch; the first radiation patch and the second radiation patch are chamfering patches which are symmetrically chamfered in a diagonal position; the second radiation patch is annular, the first radiation patch is positioned in a cavity of the second radiation patch, and the first radiation patch and the second radiation patch have a same center; the lower surface of the substrate base plate is provided with a conduction grounding plate; coaxial probe feed vertically penetrates through the substrate base plate and is directly connected with the first radiation patch to generate electric coupling, and the second radiation patch is electromagnetically coupled with the first radiation patch. The invention realizes dual-frequency circular polarization, has the characteristics of small size, low section, simple manufacture process, low cost, favorable axial ratio bandwidth and higher low-elevation gain and can be used for a high-performance satellite navigation systemreceiver. Meanwhile, the requirements of vehicle-carried equipment on the volume and weight of the antenna can be met.

Description

technical field [0001] The invention relates to an antenna, in particular to a miniaturized single-feed point dual-frequency dual-polarization microstrip antenna used in microwave communication, and belongs to the technical field of communication. Background technique [0002] In practical applications, antennas that can work in multiple frequency bands are often required, such as navigation system receivers, common antennas for transmitting and receiving of communication stations, radars and communication equipment that work in frequency hopping, and antennas that are frequency-agile and polarization-agile, etc. . Circularly polarized microstrip antennas are widely used in satellite navigation system receivers. With the wide application of satellite navigation technology in various fields of society, people put forward higher requirements for the performance of GPS antenna: [0003] 1. Wide beam and good low elevation angle performance. To achieve high-precision position...

AI Technical Summary

Problems solved by technology

The monolithic method uses different modes of a patch to work at the same time, or uses loading to form several different resonance frequencies. Although this can maintain a low profile, the planar footprint is large, which is not conducive to miniaturization

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