A Cross-Polarization Suppressed Probe-Fed Patch Antenna and Its Applications to Wide-Angle Beam-Scanning Arrays
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AbstractIn this article, H-plane cross-polarization (X-pol) radiation of probe-fed air-filled patch antennas is substantially suppressed by introducing two or more floating metal cylinders underneath the patch, respectively. The X-pol is canceled by the radiation of induced currents on metal cylinders. The working principle of the new X-pol suppressed patch (XSP) antenna is revealed by an approximate model. The X-pol level of a typical XSP antenna can be suppressed to lower than −49 and −37 dB theoretically and experimentally for |θ|≤60∘ . Two 1× 8-element arrays constructed by XSP antennas and conventional patch antennas are prototyped and measured at scanning beam angles of θ=0∘ , −40°, and −65°. The measured co-polarization (co-pol) gain of the XSP antenna array is 0.7 and 0.9 dB larger than that of the conventional patch array at θ=−40∘ and −65°, respectively. Besides, the beam scanning angle with −30 dB X-pol level of the XSP antenna array can be as wide as |θ|≤40∘ , while that of the conventional patch array is about |θ|≤12∘ . A wide-band dual-polarized XSP antenna is also presented. The measured maximum H-plane X-pol level can be lower than −29 dB within 8.7% fractional bandwidth.
Acceptance Date07/12/2021
All Author(s) ListHao Chen, Ke-Li Wu
Journal nameIEEE Transactions on Antennas and Propagation
Year2022
Month9
Volume Number70
Issue Number9
PublisherIEEE
Place of PublicationThe USA
Pages7636 - 7645
ISSN0018-926X
eISSN1558-2221
LanguagesEnglish-United States
KeywordsAntenna arrays, Patch antennas, Antennas, Antenna measurements, Probes, Substrates, Metals

Last updated on 2023-05-12 at 10:29