MICROWAVE ABSORPTION AND RADAR CROSS SECTION RCS REDUCTION

4 MICROWAVE ABSORPTION AND RADAR CROSS SECTION (RCS) REDUCTION 

A fair estimation of the microwave absorption properties of a material is provided by a quantity known as the loss tangent, 

Tan 6 (loss tangent) at 6.5 GHz vs. temperature for four-folded stretched emeraldine (P(ANi)) hydrochloride parallel to the stretch direction (x), perpendicular to the stretch direction ( ), unoriented poly(orthotoluidine) hydrochloride (o) and unoriented self-doped sulfonated polyaniline (+). After Reference [190], reproduced with permission. 

Within the last five years or so, several studies have been performed on dynamic (switchable) microwave absorbers. Studies at the US Navy s China Lake, CA facility, although highly secretive, are thought to involve metallic grids deposited on high microwave loss substrates such as Teflon on which a CP layer is deposited 

An interesting all-solid-state, microwave shutter was described by Rose et al. 

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