Quarter wavelength Fabry-Perot cavity antenna with wideband low monostatic radar cross section and off-broadside peak radiation
Document Type
Article
Publication Date
2-1-2021
Abstract
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 similar to lambda/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 degrees was achieved, with gain approaching similar to 9.4 dB. Simulation and measurement results are presented.
Keywords
Fabry-Perot Cavity (FPC), Radar cross section, Frequency selective surface, Partially reflecting surface, Off-broadside peak radiation
Divisions
fac_eng
Funders
Universiti Malaya[GPF015A-2019]
Publication Title
Applied Sciences-Basel
Volume
11
Issue
3
Publisher
MDPI
Publisher Location
ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND