A Circularly Polarized Slot Antenna Unit and Its Phased Array

Abstract

The invention discloses a two-dimensional large-angle scanning phased array based on circular polarization, which belongs to the technical field of antennas. The present invention adopts a planar microstrip structure to design a wide-beam circularly polarized antenna unit. The antenna unit includes a dielectric substrate, a feed network arranged on the front of the substrate, a square annular radiation slot arranged on the back of the substrate, and a metal reflector arranged directly below the substrate. plate. The antenna elements are properly arranged to form a phased array antenna. Finally, by controlling the feeding phase of each element, the two-dimensional large-angle scanning function of the phased array antenna is realized, and it has circular polarization characteristics.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a phased array antenna applied in multiple aspects such as vehicle-mounted, airborne, ship-borne and space-borne radar systems. Background technique [0002] Phased array antennas are a product of the development of radar systems. The early radar system obtained a larger scanning area through mechanical rotation, while the phased array antenna changed the beam pointing of the pattern by electronically controlling the phase of the array elements, thereby covering a larger scanning area. Applying it to the radar system can greatly increase the scanning speed of the system, and provide timely information for guidance, detection, search, identification, capture and tracking, which plays a vital role in the development of the radar system. The application fields of phased array antennas are mainly reflected in the field of national defense and military affairs. In land-...

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Problems solved by technology

However, it only performs one-dimensional beam scanning, and has not been expanded to two-dimensional level, and due to the characteristics of the microstrip antenna itself, the scanning angle of the ordinary microstrip phased array is very narrow, and this phased array is a linear pole Chemical radiation, resulting in its application is greatly limited

[0005] The literature "A Wide Band, Dual Polarized Patch Antenna for Wide Angle Scanning Phased Arrays (Doganay Dogan, 2013-4-12)" extends the scanning range of the phased array to the two-dimensional surface, but its work needs to be realized by dual-port control There are two working modes of horizontal polarization and vertical polarization, and the antenna structure is relatively complicated and inconvenient to control

[0006] Literature "A Broad Beam-width Microstrip Cross Antenna Design for Wide ScanAngle Phased Array (Zhao Wang; Dongmei Dan; Shaoqiu Xiao; Mingchun Tang. IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, 2013-8 -13)" has improved the two-dimensional large-angle scanning phased array so that it can radiate circularly polarized waves, but each unit needs to be controlled by two ports, which reduces the overall sensitivity of the phased array

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