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2021-09-24
Ultra-Wideband RCS Reduction of Circular Polarization Slot Antenna Array Based on Polarization Conversion Structures and Frequency-Selective Rasorber
By
Progress In Electromagnetics Research M, Vol. 105, 9-20, 2021
Abstract
This paper proposes an absorption-transmission-absorption (A-T-A) type frequency-selective rasorber (FSR) with high selectivity that is loaded above a polarization conversion structure (PCS) and applied to a circular polarization (CP) slot antenna array for ultra-wideband radar cross section (RCS) reduction. Outside the operational frequency band (out-of-band) of the antenna, the energy of the incident electromagnetic (EM) wave is directly absorbed by the FSR, whereas from within the operational frequency band (in-band) of the antenna, the incident EM wave penetrates the FSR and irradiates it on the PCS placed on the lower layer of the FSR structure, which meets the phase cancellation condition and is diffused at the same time, thereby realizing the in-band RCS reduction. Due to the lower insertion loss in the passband, higher quality factor (Q value) in the transmission band, and wider absorption band, the proposed FSR can minimize the gain loss (only 0.2 dB) of the CP slot antenna array and widen the RCS reduction bandwidth to 135.5% (5-26 GHz). In addition, due to the central symmetry of the FSR and PCS structures, the CP slot antenna array has monostatic RCS reduction performance for both horizontally polarized (HP) and vertically polarized (VP) incoming waves.
Citation
Yu-Xing Zhang Yong-Ling Ban Chow-Yen-Desmond Sim , "Ultra-Wideband RCS Reduction of Circular Polarization Slot Antenna Array Based on Polarization Conversion Structures and Frequency-Selective Rasorber," Progress In Electromagnetics Research M, Vol. 105, 9-20, 2021.
doi:10.2528/PIERM21071204
http://www.jpier.org/PIERM/pier.php?paper=21071204
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