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Micromachines
Volume 17
Issue 9
10.3390/mi17091097
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Article

A High-Aperture-Efficiency Fabry–Perot Antenna with Broadband Out-of-Band RCS Reduction Enabled by a Partially Reflective Absorptive Frequency-Selective Surface

by
Binbin Jiang
1,
Yi-Feng Cheng
2,3,
Dayong Gong
4,
Yufeng Wang
5,
Jiang Xiong
6 and
Yufeng Yu
1,5,*
1
Zhejiang Key Laboratory of Quantum Materials and Control, School of Information and Electrical Engineering, Hangzhou City University, Hangzhou 310015, China
2
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
3
School of Electronics and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
4
Hangzhou ZoanRel Electronics Co., Ltd., Hangzhou 311308, China
5
Jiaxing Novelidea Communication Technology Co., Ltd., Jiaxing 314001, China
6
Computational Electromagnetics Laboratory, Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
*
Author to whom correspondence should be addressed.
Micromachines 2026, 17(9), 1097; https://doi.org/10.3390/mi17091097 (registering DOI)
Submission received: 14 August 2026 / Revised: 9 September 2026 / Accepted: 16 September 2026 / Published: 18 September 2026
(This article belongs to the Section E: Engineering and Technology)
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Abstract

A high-aperture-efficiency Fabry–Perot (FP) antenna with broadband out-of-band radar cross-section (RCS) reduction enabled by a partially reflective absorptive frequency-selective surface (PRAFSS) is proposed. Unlike conventional absorptive frequency-selective surfaces that emphasize high in-band transmission, the PRAFSS is designed specifically for FP cavity operation. It provides controlled reflection and transmission near 1 GHz to sustain cavity resonance, while providing broadband absorption at higher frequencies for out-of-band scattering suppression. A prototype is designed, fabricated, and measured. The measured −10 dB impedance bandwidth is 965–1009 MHz (4.46%), and the measured gain reaches approximately 13.0 dBi near 985 MHz, with a gain enhancement greater than 2.2 dB relative to the reference antenna. Using the measured gain and the exact 416 mm × 416 mm physical aperture, the measured gain-based aperture efficiency is approximately 85.1%. Full-wave far-field simulations predict a continuous 10 dB monostatic RCS reduction band of 3.05–6.47 GHz. The finite-range measurement shows a consistent reference-normalized backscattering reduction band of 3.15–6.32 GHz. The results demonstrate a cavity-oriented design strategy in which high aperture utilization in the antenna operating band and broadband out-of-band scattering suppression are implemented by different electromagnetic responses of the same PRAFSS.
Keywords: Fabry–Perot antenna; partially reflective absorptive frequency selective surface; radar cross section; aperture efficiency Fabry–Perot antenna; partially reflective absorptive frequency selective surface; radar cross section; aperture efficiency

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MDPI and ACS Style

Jiang, B.; Cheng, Y.-F.; Gong, D.; Wang, Y.; Xiong, J.; Yu, Y. A High-Aperture-Efficiency Fabry–Perot Antenna with Broadband Out-of-Band RCS Reduction Enabled by a Partially Reflective Absorptive Frequency-Selective Surface. Micromachines 2026, 17, 1097. https://doi.org/10.3390/mi17091097

AMA Style

Jiang B, Cheng Y-F, Gong D, Wang Y, Xiong J, Yu Y. A High-Aperture-Efficiency Fabry–Perot Antenna with Broadband Out-of-Band RCS Reduction Enabled by a Partially Reflective Absorptive Frequency-Selective Surface. Micromachines. 2026; 17(9):1097. https://doi.org/10.3390/mi17091097

Chicago/Turabian Style

Jiang, Binbin, Yi-Feng Cheng, Dayong Gong, Yufeng Wang, Jiang Xiong, and Yufeng Yu. 2026. "A High-Aperture-Efficiency Fabry–Perot Antenna with Broadband Out-of-Band RCS Reduction Enabled by a Partially Reflective Absorptive Frequency-Selective Surface" Micromachines 17, no. 9: 1097. https://doi.org/10.3390/mi17091097

APA Style

Jiang, B., Cheng, Y.-F., Gong, D., Wang, Y., Xiong, J., & Yu, Y. (2026). A High-Aperture-Efficiency Fabry–Perot Antenna with Broadband Out-of-Band RCS Reduction Enabled by a Partially Reflective Absorptive Frequency-Selective Surface. Micromachines, 17(9), 1097. https://doi.org/10.3390/mi17091097

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