NOVEL MICROWAVE FILTER DESIGN TECHNIQUES.
Abstract
A review is presented of recent work on microwave filters, including: bandpass filters with cascaded lines of cavities; bandpass and bandstop filters with stubs and parallel-line coupling; lowpass and highpass filters; dissipative loss, group delay and power handling capacity; diplexers; directional filters; magnetically tunable filters; the connection between filters and directional couplers; and filters with open walls. Design equations are presented for comb-line filters having capacitively coupled terminations, which allow very short resonators within the filter, thereby making possible the construction of relatively compact filters in the VHF and UHF bands. Theoretical data of unloaded Q of capacitively loaded transmission line resonators are also presented. A nomogram and formulas for the design of asymmetrical spur-line sections are given. The coupled lines forming the spur-line sections of a bandstop filter are chzracterized by their distributed capacitance. The nomogram is useful for the rapid determination of preferred values of this distributed capacitance. Design considerations involved in a UHF magnetically tunable ferrimagnetic-resonator filter are discussed. Low-frequency limitations are derived and the results are plotted. Previously published mode charts are extended to include spurious resonances which can be important in some low-frequency designs. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1965
- Accession Number
- AD0473879
Entities
People
- B. M. Schiffman
- E. G. Cristal
- J. C. Palais
- Leo Young
Organizations
- SRI International