A Novel Design of a Low-loss and Low-cost Ku-Band Bandpass Filter for VSAT Applications

This paper proposes a novel method to design low-loss and low-cost Ku-band bandpass filters for VSAT applications based on substrate-integrated-waveguide technology.Narrow bandpass filters employed high-order resonant mode TE 301 exhibited high selectivity.However, its bandwidth is not enough for VSAT applications.In this paper, we proposed a method to widen the bandwidth of narrow-band filters to meet the bandwidth requirement of VSAT applications.This approach maintains high selectivity while still achieves low insertion loss.The proposed filter was fabricated using a low-cost material.Measurement shows a good agreement with simulated results.Mid-band measured insertion loss and return loss were 1.8 dB and 19.4 dB, respectively.Such low losses were obtained owing to taking advantage of a high-quality factor of high-order mode TE 301 of oversized rectangular cavities.