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A polarisation-independent tunable absorber has been presented with wide tuning range. The proposed design consists of periodic patterns of square loops connected through varactor diodes, thus resulting in tunable performance. Due to four-fold symmetric design, the structure exhibits tunable characteristic for all polarisation angles unlike the earlier reported tunable absorbers. Furthermore, the...
A polarisation-independent switchable absorber/reflector based on active frequency selective surface (AFSS) has been reported. The FSS design consists of diagonally connected circular loops on which semiconductor switches (PIN diodes) have been mounted. By controlling the bias voltage of the PIN diodes, the structure shows perfect reflection in ON state while exhibits single band absorption during...
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