Ultra-broadband Vivaldi circularly polarized phased-array antenna element

Abstract

The invention provides an ultra-broadband Vivaldi circularly polarized phased-array antenna element, which comprises four same Vivaldi antenna bodies of a stereoscopic structure and a metal reflectingplate, wherein each Vivaldi antenna body comprises a pair of ridge arms, an antenna cavity, a rectangular slot, a rectangular resonant cavity, a cylindrical coaxial outer conductor, a cylindrical coaxial inner conductor and a cylindrical coaxial feed interface; and in each Vivaldi antenna body, the antenna cavity, the rectangular slot, the rectangular resonant cavity, the cylindrical coaxial outer conductor, the cylindrical coaxial inner conductor and the cylindrical coaxial feed interface communicate with the pair of ridge arms, the pair of ridge arms is taken as a radiation area, the rectangular slot is taken as a transmission area, and the cylindrical coaxial outer conductor, the cylindrical coaxial inner conductor and the cylindrical coaxial feed interface are taken as a feeding area,so that energy receiving and transmitting are achieved by using the radiation area, the transmission area and the feeding area. The ultra-broadband Vivaldi circularly polarized phased-array antenna element designed according to the requirements of a modern radar technology on the indexes, such as the working bandwidth and the scanning angle has excellent performance of a broadband and excellent circular polarization property and simultaneously has the advantages of being miniaturized, simple in structure and low in loss, and pitching scanning at + / -35 degrees can be achieved.

Description

technical field [0001] The invention relates to the technical field of ultra-wideband antennas, in particular to an ultra-wideband Vivaldi circularly polarized phased array antenna unit. Background technique [0002] With the advancement of wireless radio frequency technology, linearly polarized antennas are no longer suitable for special equipment requirements. In terms of long-distance transmission and anti-interference, circularly polarized antennas have significant advantages. Circularly polarized waves have little attenuation in rain and snow, can penetrate the ionosphere, and are not affected by the Faraday effect produced by the earth's magnetic field. At the same time, the circularly polarized antenna can effectively suppress multipath interference or multipath fading, and does not require strict azimuth alignment between the antennas of the transmitting and receiving devices. Therefore, circularly polarized antennas are widely used in the field of wireless communic...

AI Technical Summary

Problems solved by technology

The multi-arm helical antenna has very good ultra-wideband characteristics, but its large size is not conducive to miniaturization

Although the planar helical antenna meets the requirements of low-profile design, in order to obtain better circular polarization characteristics, the antenna is still relatively large

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