Narrow-Bandwidth Elliptic-Function Filters

This paper describes the development of a practical circuit for realizing narrow-bandwidth elliptic-function filters at microwave frequencies. The design procedure is presented for TEM filters of any bandwidth up to about 10 percent. Experimental verification of the low-loss feature of the elliptic-function response is demonstrated with measured data on 1-percent-bandwidth strip-transmission-line S-band filters.