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Microwave Filters Using Quarter-Wave Couplings

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2 Author(s)
Fano, R.M. ; Massachusetts Institute of Technology, Research Laboratory of Electronics, Cambridge 39, Mass. ; Lawson, A.W., Jr.

This paper presents a method of designing bandpass and band-rejection microwave filters by appropriately transforming lumped-element filters. Such microwave filters are realized physically as chains of resonant elements (either cavities or irises), coupled by quarter-wave sections of line. A structure of this type has a number of practical advantages over other types of filter structures, such as a chain of directly coupled cavities, because it permits the construction of the resonant elements as separate units, and yields more liberal tolerances on the dimensions of the coupling irises. A comparison is made of the theoretical and measured characteristics of an experimental four-cavity filter.

Published in:

Proceedings of the IRE  (Volume:35 ,  Issue: 11 )