Abstract
A low-profile circularly polarized (CP) meta-antenna with a broadband low-RCS feature is proposed in this article. Our design is the combination of a CP antenna with a chessboard polarization conversion metasurface (CPCM) for balancing the radiation property and stealth feature. To relieve the adverse effect of the CPCM on the entire radiation performance, several redundant meta-atoms with the opposite phase state were removed to enhance the realized gain within the operation bandwidth (8.0–9.0 GHz). The proposed meta-antenna showed excellent radiation performance: −10 dB impedance relative bandwidth was 26.48% (6.78–8.85 GHz), and 3-dB axial ratio relative bandwidth was 22.03% (7.27–9.07 GHz). In addition, RCS reduction over 5 dB was achieved via our design from 8.5 to 21.5 GHz (86.67%) with the help of the deliberately designed CPCM. The final measured results demonstrate great consistency with the simulated ones.
Highlights
In recent years, antennas with a wideband low radar cross section (RCS) have drawn significant attention in the low-observable needed platforms, such as military aircraft and missiles
In Ref. [14], a gain of 3.5 dB and impedance bandwidth of 500 MHz were achieved via placing a chessboard polarization conversion metasurface (CPCM) onto a patch antenna; the RCS reduction bandwidth only covered a frequency range of 9–13 GHz
A circularly polarized (CP) slotted patch meta-antenna is presented in this article for reducing the backward RCS with the help of the predesigned CPCM
Summary
Hubei Engineering Research Center of RF-Microwave Technology and Application, School of Science, Wuhan University of Technology, Wuhan, China. A low-profile circularly polarized (CP) meta-antenna with a broadband low-RCS feature is proposed in this article. Our design is the combination of a CP antenna with a chessboard polarization conversion metasurface (CPCM) for balancing the radiation property and stealth feature. To relieve the adverse effect of the CPCM on the entire radiation performance, several redundant meta-atoms with the opposite phase state were removed to enhance the realized gain within the operation bandwidth (8.0–9.0 GHz). The proposed meta-antenna showed excellent radiation performance: −10 dB impedance relative bandwidth was 26.48% (6.78–8.85 GHz), and 3-dB axial ratio relative bandwidth was 22.03% (7.27–9.07 GHz). RCS reduction over 5 dB was achieved via our design from 8.5 to 21.5 GHz (86.67%) with the help of the deliberately designed CPCM.
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