Accurate circuit synthesis of low-pass corrugated waveguide filters

This paper presents a synthesis method for low-pass corrugated filters in rectangular waveguide. Using this method, excellent filter dimensions can be obtained in negligible CPU times, even for a demanding set of specifications. In contrast to previous works, low-pass filters with improved power handling capabilities can be successfully synthesized. The procedure is based on a low-pass prototype able to represent the real filtering structure. First, the structure discontinuities are characterized using an electromagnetical simulator, and the retrieved data is included in the prototype model. Then, the resulting prototype is optimized to obtain a suitable ideal response. From the prototype, the structure physical dimensions are synthesized. This paper aims to show the good performance provided by the proposed method and the benefits which can be obtained from its use.