40GHz planar filter on Duroid

This paper presents a planar bandpass filter design and its realization using 127μm RT/Duroid 5880 for 40GHz wireless communications applications. The filter has been designed at the center frequency of 41GHz with 2GHz passband using classical hairpin structure. The hairpin filter layout formulation is presented. Agilent's Advanced Design System Momentum is then used to carry out the EM simulation. The finalized filter layout is fabricated using the standard single-layer Printed Circuit Board (PCB) process. The fabricated filter shows 3.5dB insertion loss in the desired frequency range and the return loss is better than 10dB.