NOVEL MICROWAVE FILTER DESIGN TECHNIQUES.
Abstract
An algorithm is presented that enables a designer efficiently and quickly to compute the design parameters of microwave band-step filters. Tables of band-stop filter designs that give maximally flat and Chebyshev responses are presented for ten typical stop-band fractional bandwidths. Work on designing multiplexers having noncontiguous channels was continued. Computed responses of several designs showed that undesirable reactances result from coupling irises and junction effects when microwave band-pass and band-stop filters are used with iris-coupled resonators in the multiplexer channel units. To obtain the desired off-channel low VSWR for each channel, these reactances must be reduced, either by compensation or by using semi-lumpedelement resonators. Proposed filters using a novel form of circular TE011-mode resonators are described. This type of resonator has an internal field configuration similar to that in a cylindrical TE011 resonator, but in this case the cylindrical side walls are removed and replaced by two radial lines that are cut off to the desired TE011 mode. The objective of work on this type of resonator is to permit the design of filters having high-Q resonators that are free of unwanted resonances on up to frequencies much above the pass-band frequency. The results obtained from tests on four somewhat different resonator configurations are described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1963
- Accession Number
- AD0430255
Entities
People
- D. B. Weller
- E. G. Cristal
- G. L. Matthaei
Organizations
- SRI International