Design of Interdigital Bandpass Filters for Millimeter Wave Applications

Abstract

This work presents a third-order interdigital bandpass Butterworth filter designed to operate in the ISM band from 57 to 66 GHz. The project adopted an aluminum oxide (alumina) substrate, copper microstrip transmission lines and a coplanar waveguide (CPW) interface. We performed electromagnetic analysis in Ansys EM using the Finite Element Method (FEM). The filter presented return loss greater than 10 dB and insertion loss greater than 4.47 dB from 57.04 GHz to 65.45 GHz. We will fabricate the device using the Metallic-Nanowire-Membrane technology.