Phase Characteristics of Multi-Layer Crossed-dipole FSS in Salisbury Screen Absorber

Abstract

In this paper the microwave absorbing properties of multiband Salisbury screen absorber design which is constructed using multi-layer FSS is investigated. The multiband properties are obtained by exploiting the phase change offered by the cross dipole FSS. Hence, the details phase characteristic are important to achieve multi-band characteristics. The structure exhibits triple operating band where the −10 dB reflectivity bandwidth of a Salisbury screen operating at normal incidence is 38.1%, 12.1% and 17.2% at the resonant frequencies of 6.56 GHz, 9.1 GHz and 13.0 GHz respectively. Reflectivity predictions for normal incidence are shown to be in close agreement with bistatic measured results over the frequency range 8 – 12 GHz.