TY - JOUR
T1 - Quarter wavelength fabry–perot cavity antenna with wideband low monostatic radar cross section and off-broadside peak radiation
AU - Umair, Hassan
AU - Latef, Tarik Bin Abdul
AU - Yamada, Yoshihide
AU - Hassan, Tayyab
AU - Mahadi, Wan Nor Liza Binti Wan
AU - Othman, Mohamadariff
AU - Kamardin, Kamilia
AU - Hussein, Mousa I.
N1 - Funding Information:
Funding: This research was funded by University of Malaya (UM), grant number GPF015A-2019.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - 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.
AB - 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.
KW - Fabry–Perot Cavity (FPC)
KW - Frequency selective surface
KW - Off-broadside peak radiation
KW - Partially reflecting surface
KW - Radar cross section
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U2 - 10.3390/app11031053
DO - 10.3390/app11031053
M3 - Article
AN - SCOPUS:85100084394
SN - 2076-3417
VL - 11
SP - 1
EP - 18
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
IS - 3
M1 - 1053
ER -