A graphene-based THz wave duplexer and filter: Switching via gate biasing

Abstract

This work introduces a Graphene-based multi-layer reconfigurable device as a wave duplexer in the THz frequency range. Adjusting transmitting and reflecting parts of incident waves alongside controlling absorption provides the interesting capability to select target waves in different frequencies. The proposed device includes periodic graphene patterns on both sides of silicon dioxide as substrate. Additionally, the patterns are biased differently compared to conventional patterns which makes it possible to achieve two distinct behaviors versus frequency. Exploiting equivalent circuit models (ECM) for graphene and dielectric, the whole device is modeled by passive RLC circuits.According to simulation results, the proposed device can transmit and reflect incident THz waves at desired frequencies in 0.1 THz to 30 THz which makes it an ideal candidate for manipulating THz waves in terms of transmission and reflection.

A High Performance Duplexer Based on Dual-mode E-type Resonator

“…The most commonly used duplexer is to combine two bandpass filters into a three-port impedance matching network [8][9][10]. A large-sized T-shaped joint circuit is widely adopted in the combination to produce good transmission in one passband and good attenuation in the other.…”