Wide Axial Ratio Bandwidth Dual Frequency Dual Circularly Polarized Microstrip Array Antenna

Abstract

The invention discloses a wide axial ratio bandwidth dual-frequency dual-circular-polarization microstrip array antenna. The device comprises a single layer microwave dielectric substrate, four circularly polarized radiation patches with the working frequencies of f1, four circularly polarized radiation patches with the working frequencies of f2, and one dual-frequency shared microstrip power divider network, wherein the circularly polarized radiation patches with the working frequencies of f1 and f2 are uniformly distributed on a periphery with a point O as the center and are in an alternate distribution, the dual-frequency shared microstrip power divider network comprises two Wilkinson power dividers, a T type power divider, two 90-degree phase shifters with the working frequencies of f1 formed by microstrip lines, two 90-degree phase shifters with the working frequencies of f2, and a dual-frequency shared 180-degree phase shifter. According to the antenna, the dual-frequency circular polarization axial ratio bandwidth is effectively increased, by using the microstrip line feed, a high gain array with a larger diameter can be formed through expansion, the structure is simple, the profile is low, and the realization is easy.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a wide-axis-ratio-bandwidth dual-frequency dual-circularly polarized microstrip array antenna. Background technique [0002] With the advancement of technology and the increasingly complex electromagnetic environment, the current radar and communication systems undertake more and more functions, and multi-functional integration has become an important development trend. However, for wireless systems such as radar and mobile communications, each function requires a separate antenna. This not only makes the antenna bulky, but also compresses the available space of other hardware in the system, which is not conducive to the miniaturization and integration of the system. In this context, the multi-frequency, multi-polarization common-aperture design of antennas has become an important research direction in the field of antennas, among which dual-frequency dual-polarization antennas...

AI Technical Summary

Problems solved by technology

However, although there are many studies on this antenna, they all have a common shortcoming, that is, the dual-frequency circular polarization axis ratio of the antenna is too narrow.

For microstrip antennas, the circular polarization axial ratio bandwidth is often smaller than the antenna's standing wave ratio bandwidth, so a narrower axial ratio bandwidth will severely limit the antenna's operating bandwidth

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