X-band circularly polarized array antenna and ship radar

Abstract

The invention provides an X-band circularly polarized array antenna, which comprises a dielectric substrate, a plurality of radiation unit patches, a feed network, impedance converters, a metal groundplate and an input connector, wherein the plurality of radiation unit patches are arranged at the front of the dielectric substrate, the impedance converters connect the radiation unit patches and the feed network, the metal ground plate and the input connector are arranged at the back of the dielectric substrate, and the input connector is connected with a feed point of the feed network throughthe metal ground plate and the dielectric substrate; and the radiation unit patches are of a corner feeding mode, and the radiation unit patches are arranged at two sides of the feed network in a staggered mode. According to the invention, The X-band circularly polarized array antenna feeds the radiation unit patches in a corner feeding mode, so that the circular polarization performance can be better met compared with a linearly polarized array, and thus the anti-interference ability is high. In addition, the radiation unit patches are arranged at two sides of the feed network in a staggeredmode, so that the size in the transverse direction is small compared with a linear array antenna. Furthermore, the invention further provides ship radar containing the antenna, which has the effects mentioned above.

Description

technical field [0001] The invention relates to the field of radio frequency technology, in particular to an X-band circularly polarized array antenna and a ship radar. Background technique [0002] Antennas have a particularly wide range of applications, for example, in ship radars. Ship radar can effectively avoid ship collision and play a very important role in reducing the loss of life and property. [0003] The antenna is an important part of the radar, and its index directly affects the overall performance of the radar. The antenna structure in the traditional ship radar mostly adopts the waveguide slot antenna, but the size of the waveguide slot antenna is large and the processing cost is high. In order to improve the tracking ability of small fast-moving targets, it is necessary to further increase the antenna rotation speed, but it is not easy to achieve high rotation speed for large-size antennas, so its application will be limited. Based on this situation, beca...

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Problems solved by technology

[0004] However, most of the current ship radar antennas are horizontally polarized, and their ability to resist sea clutter is good, but their ability to resist interference such as rain and fog is poor

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