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In this paper a double square loop switchable metamaterial absorber based on active frequency selective surface (AFSS) is introduced. The design of AFSS structure is comprised of periodically arranged square loops with PIN diodes. There are four states simulation results can be presented by controlling the bias voltage of the PIN diodes, and the method for the design of feeder circuits is probe-fed...
In this paper, we present a multifunctional active frequency selective surface (MAFSS), which consists of two metallic layers and a substrate layer. Three electromagnetic functions of switching, polarization selection and frequency tuning, are integrated into a single board. The bias networks are embedded in each layer and comprise the MAFSS elements themselves, which eliminates the need of extra...
This paper proposes a 2-b multifunctional active frequency selective surface (MAFSS) whose structure is made up of two metallic layers printed on both sides of an F4BME substrate, measuring $320 \times 320 \times 0.8$ mm3. The PIN diodes, embedded on two metallic layers, are controlled through two independent sets of external dc bias network. No additional feeder lines are considered necessary within...
In this paper, we propose a multifunctional active frequency selective surface (MAFSS), which can be switched freely between the electromagnetic switching function and the polarization selection function. Thus, four different working states can be attained by controlling two external bias networks independently. Resonant structures take upon themselves the role of allowing DC currents to pass through...
A 2-bit active frequency selective surface (AFSS) is designed, fabricated and measured in this paper. This FSS structure loaded PIN diodes and biasing lines are designed carefully to realize four switchable states (2-bit): both TE polarization & TM polarization band-pass filter for code 00; TE band-pass filter or polarizer for code 01; TM band-pass filter or polarizer for code 10; both TE &...
A reconfigurable electromagnetic shield by active frequency selective surface (AFSS) with switch function at LTE-D 4G mobile communication is proposed in this paper. Double coupled metallic meandered structures on one layer substrate loaded PIN diodes are designed carefully to realize the band-pass characteristic at 2.6GHz when PINs are OFF and the rejection characteristic when PINs are ON. The proposed...
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