Development of low loss Ka-band narrowband bandpass filter using a dual mode coplanar type circular slot resonator

Millimeter wave frequency bands have been explored to enhance the radio resource. Developments of low loss millimeter wave filters are also expected. In this paper, a low loss Ka-band 2-pole narrowband bandpass filter for a planar type circuit is proposed. The filter is constituted with a coplanar type circular slot resonator with a dual resonance mode and high Q value. The simulated and measured results validate low loss, small volume and productivity characteristics of the proposed filter.