Quasi-Lowpass, Quasi-Elliptic Synmetric Filter

Levy has shown that a function developed by Acheiser/Zolotarev (LAZ) can yield a Iowpass response with we large reflection ripple near dc. Rhodes and Alseyab developed a novel method of obtaining even/odd mode impedances of a symmetrical network and applied their technique to low pass filters with one transmission zero (TZ) at infinity and all others at a specified stopband frequency. This paper combines outstanding features of these references to present a new quasi-lowpass, quasi-elliptic symmetric filter having LAZ passband response and finite stopband TZ´s. Design advantages are pointed out and filter realizations are discussed.