Dual-polarized microstrip phased-array antenna unit and array thereof

Abstract

The invention relates to a dual-polarized microstrip phased-array antenna unit, which comprises a radiation structure, a feed structure and a metal back cavity, and is characterized in that the radiation structure comprises a first dielectric layer and a second dielectric layer, a parasitic patch is arranged on the lower surface of the first dielectric layer, a radiation patch is arranged on the upper surface of the second dielectric layer, and the radiation patch and the parasitic patch are oppositely arranged; the feed structure comprises a third dielectric layer, a grounding plate, a fourth dielectric layer, a first polarization feeder line and a second polarization feeder line, the grounding plate is arranged between the third dielectric layer and the fourth dielectric layer, the first polarization feeder line is arranged between the second dielectric layer and the third dielectric layer, and the second polarization feeder line is arranged on the lower surface of the fourth dielectric layer. According to the phased-array antenna, the antenna unit adopts the broadband microstrip unit coupled by multiple layers of patches, the metal back cavity is added below the antenna to control backward stray radiation, and the phased-array antenna obtained by adopting the antenna unit can achieve the effects of broadband wide-angle scanning, high isolation, low side lobe, high front-to-back ratio and low profile at the same time.

Description

technical field [0001] The present invention relates to the technical field of antennas, in particular to a phased array antenna unit and an array thereof. Background technique [0002] One of the difficulties in the design of wide-angle scanning phased array antennas is impedance matching. When the scanning angle of the antenna array beam changes, the input impedance of the antenna will also change accordingly. If the change is too large, it will cause antenna mismatch and reduce the radiation efficiency. [0003] One of the ways to improve impedance matching is to reduce the coupling between elements. R.Xia et al proposed a decoupling network to reduce the coupling between antenna elements (R.Xia, S.Qu, P.Li, D.Yang, S.Yang and Z.Nie. "Wide-Angle Scanning Phased Array Using an Efficient Decoupling Network".IEEETransactions on Antennas and Propagation, Nov.2015, vol.63, no.11, pp.5161-5165.), achieved wide-angle impedance matching, but the antenna side lobe is high, and ...

AI Technical Summary

Problems solved by technology

Especially the balun structure has high tolerance requirements for design and processing, and the dual-polarized feeder is often perpendicular to the antenna, so the reliability is poor

The broadband microstrip antenna obtains ultra-wideband characteristics by extending its unit size vertically and lowering its minimum cut-off frequency, and has good beam scanning performance, but its long longitudinal size severely limits its engineering application in low-profile systems

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