Memristor Based Frequency Switching in Bandpass Filters

Abstract

Here we present a switchable bandpass filter (BPF) based on open loop resonators employing switching property of memristors. Memristor (MR) is a two state programmable non-volatile resistor, having small size and low power consumption. The proposed BPF utilizes MR placed at the open loop slit for switching between the open loop and closed loop characteristics. Memristor material analyzed here is HfO2, but proposed design can utilize any material with memristive properties. Electromagnetic simulations show that 3-loop resonator with highly resistive MR has two resonating modes, at ∼2.5 GHz and ∼7.7GHz. Once MR is switched to low resistance state, BPF has resonance frequency of a closed loop at ∼6.8 GHz. The proposed idea is validated with the help of electromagnetic and circuit simulations. Using MR as the switching element reduces the power needed for switching and the dimension of the resonator contributing to the development of compact filter designs.