Optimisation of a pyramidal geometric transition radar absorbing material loaded with a resistive frequency selective surface

Dept. of Electr. & Electron. Eng., Univ. of Sheffield, Sheffield, UK
IET Radar Sonar ? Navigation (Impact Factor: 1.14). 01/2010; DOI: 10.1049/iet-rsn.2008.0185
Source: IEEE Xplore


Designs for an improved pyramidal geometric transition radar absorbing material incorporating frequency selective surfaces loaded with either distributed or lumped resistance are presented. It is shown, through full-field simulation, that for a given absorber, the inclusion of impedance loading can reduce the frequency at which a -40-dB reflectivity level is obtained from 6 to 2 GHz. Oblique incidence and variable tolerancing are also discussed.

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    ABSTRACT: This paper presents a topology for improving the low frequency performance of pyramidal radar absorbing materials at oblique angles of incidence. The technique uses an embedded frequency selective surface as an impedance matching layer and improves the −40dB reflectivity limit from 6GHz to 4GHz for 102mm pyramidal absorber. The frequency selective surface is based on a resistively loaded dipole FSS and simulations of optimised results of the modified RAM structure are presented.
    Antennas and Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference on; 01/2010