A Parallel Coupled Microstrip Filter Design Procedure

1 January 1970

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

p. 29-32
https://doi.org/10.1109/gmtt.1970.1122760

Abstract

The increased use of microstrip transmission line for miniaturized printed microwave circuits has created a demand for a compact filter structure compatible with microstrip. The parallel coupled filter circuits developed by Cohn are very compact, but his design procedure does not apply to microstrip which has different even and odd mode velocities. This paper develops the theoretical analysis to compensate Cohn's procedure for even and odd mode velocity differences and develops design curves which permit the determination of the circuit geometry from the parameter K/Z/sub o/. The results only apply to filters with 50 /spl Omega/ impedance on 99.5% alumina substrates, but they can easily be generalized to other impedances.

Keywords

This publication has 3 references indexed in Scilit:

Parameters of Microstrip Transmission Lines and of Coupled Pairs of Microstrip Lines
IEEE Transactions on Microwave Theory and Techniques, 1968
Dissipation Loss in Multiple-Coupled-Resonator Filters
Proceedings of the IRE, 1959
Parallel-Coupled Transmission-Line-Resonator Filters
IEEE Transactions on Microwave Theory and Techniques, 1958