Compact High-Performance Planar Bandpass Filters with Arbitrarily-Shaped Conductor Patches and Slots

This paper develops planar circuit filters consisting of arbitrarily-shaped conductor patches and slots on conductor-backed dielectric substrate, which are designed by optimization technique based on the genetic algorithm. The developed filter has multiple resonators and their mutual couplings in the limited space by using both sides of the substrate, so that its high-performance and compactness are realized. We first demonstrate the effectiveness of the present filter structure from some design samples numerically and experimentally. Then as a practical application, we design a compact UWB filter, and its excellent filter characteristics are verified from the measurements.