Active phased-array antenna row feed

Abstract

The invention provides an active phased-array antenna row feed. The active phased-array antenna row feed comprises a dual-polarization low-profile microstrip antenna linear array, a sub-array-level dual-polarization feed network, a sub-array-level transceiving module and a row feed-level dual-polarization feed network which are stacked in sequence. The dual-polarized low-profile microstrip antenna linear array comprises a plurality of dual-polarized microstrip patch wireless units which are uniformly arranged at equal intervals in the linear array direction, each dual-polarized microstrip patch wireless unit realizes horizontal and vertical dual-polarized performance through port feed, and the dual-polarized low-profile microstrip antenna linear array is expanded to be circularly polarized.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to an active phased array antenna line feed. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] The phased array weather radar has a fast scanning speed and strong monitoring and detection capabilities in the entire airspace, which can overcome the shortcomings of the current weather radar, help early detection, early warning, and early decision, so as to reduce losses caused by disaster weather. It is the next generation of weather radar The main direction of development of detection technology. Different from traditional point target detection radars, phased array weather radars need to identify meteorological targets, and use the different response characteristics of horizontal and vertical polarized electromagnetic waves to meteorological targets to judge ...

AI Technical Summary

Problems solved by technology

At present, about 90% of the phased array weather radars use the waveguide slot antenna for line feed. The waveguide slot antenna has the obvious advantages of low cost, low loss, and high yield. There are significant shortcomings that restrict the development of technology applications: it is difficult to achieve horizontal and vertical dual polarization performance on the same antenna line feed, it is difficult to ensure dual polarization consistency, it is difficult to achieve large-angle scanning, and there are frequency sweep and dispersion effects

Although the orthogonally arranged microstrip dipoles can simultaneously realize the horizontal and vertical polarization functions of the same phase center, the use of a large-scale Wilkinson power division network not only increases the hardware cost and equipment debugging cost, but also greatly increases the RF network loss and noise figure loss

For example, in the C-band, the traditional dipole antenna line feed with 1° beamwidth needs a power division network of about 1 minute 64, and the loss exceeds -3dB; and as the frequency becomes higher and the beam becomes narrower, the microstrip power division network The resulting loss is greater, which seriously restricts the application of this type of antenna line feed

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