Abstract
This paper presents a novel automated microwave filter tuning method based on successive optimization of zeros of return loss characteristics. The proposed method consists of two stages; coarse and fine tuning stages. In the first stage, called coarse tuning, the phase response error of the target filter is minimized. Then in the second stage, called fine tuning, we optimize the position of zeros of return loss characteristics. Performance of the proposed tuning procedure is evaluated through some experiments of actual filter tuning.
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