An approximate complex filter including no transformers is proposed. The proposed filter does not have the equiripple passband response. However, the narrower the passband width of the prototype filter, the smaller the deviation of the proposed filter from the prototype filter is. A third-order complex filter is designed.
J-STAGEがリニューアルされました! https://www.jstage.jst.go.jp/browse/-char/ja/
