Open AccessDesign of a randomised arrangement AMC surfaces for RCS reduction based on equivalent circuit modelling
Author(s) -
Varkani Ali Ramezani,
Firouzeh Zaker Hossein,
Nezhad Abolghasem Zeidaabadi
Publication year - 2018
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2017.1146
Subject(s) - reduction (mathematics) , equivalent circuit , electronic engineering , computer science , materials science , engineering , electrical engineering , mathematics , geometry , voltage
This study aims to present a thin and broadband meta‐surface for both mono‐static and bi‐static radar cross‐section (RCS) reduction being able to operate in large range of incident angles and different polarisations. Meta‐surfaces are formed through the combination of two artificial magnetic conductor (AMC) cells arranged in periodic and randomised fashions in order to suppress the scattered fields in low levels in all directions as well as minimising the maximum RCS of the metallic surface. By appropriate design of each AMC, and using equivalent circuit method, the reflection coefficients of these surfaces are designed in a way to reach 180 (±37°) phase difference over a wide range of frequencies and incident angles. The bandwidth for 10 dB mono‐static RCS reduction is about 53% for both periodic and randomised structures at the normal incidence. It is illustrated that the randomised arrangement structure has 3 dB lower maximum bi‐static RCS compared with the periodic structure. Finally, the periodic and randomised arrangement prototypes are fabricated and measurements of their mono‐static RCS are conducted. The validity of the study design is fulfilled by achieving an acceptable agreement between the measured and simulated results.