Wide axial ratio bandwidth dual-frequency dual-circular-polarization microstrip array antenna

Abstract

The invention discloses a wide-axis-ratio-bandwidth dual-frequency dual-circularly polarized microstrip array antenna. The device includes a single-layer microwave dielectric substrate, four operating frequencies f 1 Circularly polarized radiation patch, 4 operating frequencies f 2 Circularly polarized radiation patch, and a dual-frequency shared microstrip power division network; wherein, the operating frequency is f 1 , f 2 Circularly polarized radiation patches are evenly distributed on the circle centered on point O, and the working frequency is f 1 , f 2 Circularly polarized radiation patch interval distribution; the dual-frequency shared microstrip power division network includes 2 Wilkinson power dividers, 1 T-shaped power divider, and 2 operating frequencies composed of microstrip lines for f 1 90° phase shifter, 2 operating frequencies f 2 90° phase shifter and a dual-frequency shared 180° phase shifter; the invention effectively increases the dual-frequency circular polarization axial ratio bandwidth, and can be easily extended to a high The gain array has simple structure, low profile and easy realization.

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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