Convert Microwave Circuits Into Useful L-C Circuits

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  • Author: Richard M. Kurzrok
The classic microwave three half wavelength hybrid ring was converted into an L-C version almost 40 years ago [1]. Subsequently, this design tech-nique was applied to other microwave circuits such as quadra-ture hybrids, quarter-wave coupled band-reject filters, Wilkinson dividers, and multi-quarter-wave transformers. The advantage of supplementary filtering was recog-nized many years after the original paper.