I am currently designing a narrow band filter using Open Lopp Resonator. But unfortunately i didnt get any material on the theory of Open Loop Resonator. Please give me any link or data regarding design of open loop resonator....
In the linked overview, you'll find a basic desription of open loop resonators respectively filters starting on page 13. The paper linked by ckshivaram is dedicated to the more specific topic of slow wave filters. **broken link removed**