Design and measurement of cavity enclosed microstrip edge-coupled bandpass filter at Ku band

In this paper, design of an edge coupled cavity-enclosed, axially rotated, Bandpass filter (BPF) at Ku band is presented. Effects of a properly designed cavity are included in the simulations of the BPF performance for subsequent manufacturing. The BPF is realized on a substrate with dielectric constant of 2.2. The filter is fabricated, enclosed in the manufactured cavity (with its waveguide cutoff frequency close to operating frequency) and measurement results are presented.