Synthesis of Narrow-Band Direct-Coupled Filters
- 1 October 1952
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IRE
- Vol. 40 (10), 1219-1223
- https://doi.org/10.1109/jrproc.1952.274116
Abstract
This paper describes a general synthesis procedure for the design of narrow-band, direct-coupled filters, based on an approximate first-order equivalence between direct and quarter-wave coupled filters. Thus a quarter-wave coupled filter, whose bandwidth is a few per cent wider than required, serves as a prototype. The approximations underlying the synthesis procedure for quarter-wave coupled filters, given by Lawson and Fano and applied by Mumford to the "maximally fiat" case, are re-examined and justified. The transmission characteristics of a six-cavity filter of total Q of 37.6 is computed exactly with excellent agreement with the prototype performance. Experimental confirmation is given.Keywords
This publication has 4 references indexed in Scilit:
- Microwave Filter Theory and DesignProceedings of the IRE, 1949
- Maximally-flat Filters in WaveguideBell System Technical Journal, 1948
- Microwave Filters Using Quarter-Wave CouplingsProceedings of the IRE, 1947
- Quarter Wave Coupled Wave-Guide FiltersJournal of Applied Physics, 1947