A Coupled "Coaxial" Transmission-Line Band-Pass Filter

1 January 1950

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IRE

Vol. 38 (1) , 48-52
https://doi.org/10.1109/jrproc.1950.232788

Abstract

Band-pass filters employing tuned coupled circuits are used to advantage at low frequencies and, because they have good electrical characteristics, it may be desirable to adapt them to the very-high frequencies. However, at frequencies bordering on the microwave region, it is no longer possible to treat such circuit elements in the usual low-frequency fashion, the distributed character of the parameters becoming of prime importance. This paper describes a band-pass filter in which the coupled elements consist of a shielded pair of cylindrical conductors. Because the analysis is based upon transmission-line theory, the results are valid and usable at microwave frequencies until transmission other than the TEM mode becomes bothersome.

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