An x-band marine radar microstrip antenna array

Abstract

The invention discloses an X-band marine radar microstrip antenna array. The concrete structure comprises a dielectric substrate, a series-fed microstrip array, a feed network and a metal floor. The series-fed microstrip array is fixedly connected on the upper surface of the dielectric substrate. The metal floor is fixedly connected on the lower surface of the dielectric substrate. The series-fedmicrostrip array comprises a series-fed microstrip subarray I, a series-fed microstrip subarray II, a series-fed microstrip subarray III and a series-fed microstrip subarray which are identical in structure. The series-fed microstrip subarray I comprises a plurality of radiation patches and a plurality of step impedance connection lines. The sidelobe level is reduced, the beam width is optimized and cross polarization is suppressed by adjusting the step impedance connection lines. According to the structure, the step impedance connection lines are used so as to reduce the sidelobe level, optimize the beam width and suppress cross polarization.

Description

technical field [0001] The invention relates to the field of radio frequency technology, in particular to an X-band marine radar microstrip antenna array. Background technique [0002] Marine radar is used for navigation avoidance and ship positioning. In the case of poor visibility, it can ensure the safe navigation of the ship. The antenna is an important part of the radar, and its index directly affects the overall performance of the radar. Traditional marine radar antennas mostly use a waveguide slot structure, but the size of the waveguide slot antenna is large and the processing cost is high. In order to facilitate installation and improve the ability to track small fast-moving targets, it is necessary to further reduce the size of the antenna and increase the rotational speed. [0003] The radar antenna with microstrip structure is low in cost and small in size, and is suitable for installation on medium and small ships. At present, the marine radar antenna array ...

AI Technical Summary

Problems solved by technology

Most of the 180-degree phase shifters currently used are composed of half-wavelength transmission lines, which occupy a large circuit area and have a narrow operating bandwidth.

In addition, the feed network of the parallel-fed and serial-fed microstrip antenna arrays of the traditional structure will produce stray radiation, which reduces the cross-polarization discrimination rate and gain of the antenna.

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