Novel single layer reconfigurable frequency selective surface with UWB and multi-band modes of operation

Abstract

This paper proposes a novel reconfigurable frequency selective surface (FSS) structure for ultra-wide band (UWB) and multi-band applications. The proposed structure is a simple single layer FSS printed on 10mm×10mm×1.6mm FR4 substrate. This structure embraces a simple square loop on the front side of the substrate whereas; another one along with two vertical arms is incorporated on the backside. Innovatively, a wise combination of diodes is embedded on the substrate's backside which are handled through a DC feed line circuit. By an effective diodes switching, three operating modes are attained. In the context of UWB filtering, the proposed FSS contributes in remarkable rejection of UWB frequencies through the “ON” state of all diodes. However, assigning a specific set of diodes in “ON” state provokes multi-band operating mode in which WiMAX, WLAN, and Ku bands are rejected. Moreover, setting all the diodes at “OFF” state extends the rejection capabilities by dismissing an additional frequency range. Furthermore, a remarkable notice relates to higher attenuation in shielding effectiveness (SE) acquired for rejection bands. Extensive numerical and experimental studies are devised to found a suitable comparison platform. The close agreements between the obtained results are acknowledging the suitable performance of the proposed FSS.