Quarter wavelength fabry–perot cavity antenna with wideband low monostatic radar cross section and off-broadside peak radiation

Hassan Umair, Tarik Bin Abdul Latef, Yoshihide Yamada, Tayyab Hassan, Wan Nor Liza Binti Wan Mahadi, Mohamadariff Othman, Kamilia Kamardin, Mousa I. Hussein

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Since antennas are strong radar targets, their radar cross section (RCS) reduction and radiation enhancement is of utmost necessity, particularly for stealth platforms. This work proposes the design of a Fabry–Perot Cavity (FPC) antenna which has wideband low monostatic RCS. While in the transmission mode, not only is gain enhancement achieved, but radiation beam is also deflected in the elevation plane. Moreover, the design is low-profile, i.e., the cavity height is ~λ/4. A patch antenna designed at 6 GHz serves as the excitation source of the cavity constructed between the metallic ground plane and superstrate. The superstrate structure is formed with absorptive frequency selective surface (AFSS) in conjunction with dual-sided partially reflective surface (PRS). Resistor loaded metallic rings serve as the AFSS, while PRS is constructed from inductive gradated mesh structure on one side to realize phase gradient for beam deflection; the other side has fixed capacitive elements. Results show that wideband RCS reduction was achieved from 4–16 GHz, with average RCS reduction of about 8.5 dB over the reference patch antenna. Off-broadside peak radiation at −38 was achieved, with gain approaching ~9.4 dB. Simulation and measurement results are presented.

Original languageEnglish
Article number1053
Pages (from-to)1-18
Number of pages18
JournalApplied Sciences (Switzerland)
Issue number3
Publication statusPublished - Feb 1 2021


  • Fabry–Perot Cavity (FPC)
  • Frequency selective surface
  • Off-broadside peak radiation
  • Partially reflecting surface
  • Radar cross section

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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