High-isolation dual-polarization circular-seam microstrip antenna unit

Abstract

The invention provides a high-isolation dual-polarization circular-seam microstrip antenna unit, and the antenna unit can be used to increase the port isolation of an antenna substantially. A box body with a metal enclosure frame (2) is arranged between a metal plate (1) and a microstrip dielectric plate (5), the middle of a cavity of the box body is provided with a short-circuit stud (3) which is fixed to a radiation patch (6) via a metal screw (7) and improves the port isolation of the antenna, two feed holes (8) separate from each other, parallel with each other and symmetrical with each other by taking the short-circuit stud (3) as the center are prepared in the radiation patch (6), circular seams (9) which are concentric with the feed holes are formed in the outer rings of the feed holes respectively, the circular seams for linearly polarized feed in the diagonals of + / -45 degree simultaneously, and capacitive loading is carried out on the antenna. According to the invention, the port isolation of the antenna is improved, the antenna unit is characterized by high isolation, and the problem that a traditional patch antenna is low in bandwidth and port isolation is solved.

Description

technical field [0001] The invention relates to a low-profile high-isolation dual-polarized annular slot microstrip antenna mainly used in mobile communication system base stations. Background technique [0002] Antennas are an integral part of contemporary wireless communication systems. With the rapid development of modern wireless communication technology, global positioning system (GPS), satellite communication, synthetic aperture radar (SAR), wireless personal communication (WLAN) and other fields require light-weight, low-profile, and easy-to-conform dual-polarization antenna. The microstrip antenna has the advantages of diverse feeding modes and polarization forms, and is easy to integrate with the feeding network and active circuit. With the continuous development of PCB technology, the requirements for system integration are getting higher and higher. Microstrip antennas are widely used in various wireless communication devices due to their advantages of low cost,...

AI Technical Summary

Problems solved by technology

This feeding method can complete the matching work well as long as the depth of the microstrip line embedded in the patch is properly adjusted when performing impedance matching, but this method will excite the surface wave effect and consume radiation as the thickness of the substrate increases. Power, reduce antenna efficiency, its impedance bandwidth is generally only about 2% -5%

When the coaxial probe feeds the microstrip antenna, the inner conductor is connected to the patch, and the outer conductor is grounded. It is also very easy to process and manufacture, but the bandwidth is also narrow

Due to their inherent asymmetry, the microstrip line and coaxial probe feeding methods are prone to high-order modes, which in turn will generate large cross-polarized radiation

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