A Tunable Frequency Selective Surface for Band Pass and Band Stop Applications

Abstract

In this work, a low-profile reconfigurable frequency selective surface capable of dynamically tuning the frequencies for band-pass and band-stop filtering applications is proposed. To realize this, a single-layered FSS is designed with tapered metal strips separated by a central gap and square metal patches positioned at the corners. Two PIN diodes are embedded in both the top and bottom layers. They are positioned at the center of the 45°-oriented metal strips, and for the frequency tuning, at least one of the diodes must be in the ON state. When both the diodes are ON, the tunable metasurface exhibits band-pass characteristics from 8.56- 14.8 GHz and band-stop characteristics from 3.08- 5.2 GHz. Similarly, when the PIN diode is in OFF state, the transmission window is from 6.25-8.1 GHz and band-stop window is from 3.1-4.3 GHz. With these transmission and reflection characteristics, the proposed work is best suitable for wireless and radar applications. © 2024 International Radio Science Union (URSI).