Absorptive filter integrated single pole double throw switch using switchable ring resonator

Abstract

In this paper, a reconfigurable ring resonator-based filter integrated switch (FIS) was presented. The FIS was made up of two absorptive ring resonators, reconfiguring between band-stop and band-pass responses, and integrated with single pole double throw (SPDT) switch. A simple mathematical analysis of isolation and insertion loss of filter-integrated SPDT switch was discussed. PIN diodes were used as the switching elements for the SPDT switch and to reconfigure between the band-stop and band-pass responses. The proposed absorptive FIS design could be used for wireless data communication systems such as Zigbee and Bluetooth at an operation frequency of 2.45 GHz. As a result, the proposed FIS exhibited 2 dB of insertion loss and better than 38 dB of isolation. Therefore, the key advantages of the proposed FIS design are low insertion loss, high isolation and good return loss at both ON- and OFF-state ports.