Design of Interdigital Bandpass Filters for Millimeter Wave Applications

This work presents the design of a third-order band-pass interdigital filter with Butterworth response 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 CPW interface. We performed electromagnetic analysis in Ansys EM using the Finite Element Method (FEM). The filter presented return loss greater than 10dB and insertion loss greater than 4.47dB from 57.04 GHz to 65.45 GHz. We will fabricate the device using the Metallic-Nanowire-Membrane Technologic.