INVESTIGATION OF MICROWAVE DIELECTRIC-RESONATOR FILTERS
Rept. no. 8 (Final), 1 Jun-31 Dec 1965
RANTEC CORP CALABASAS CA
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Coupling between dielectric-disk resonators, which are axially oriented along the center line of a cut-off circular tube, has been analyzed and a coupling coefficient formula has been derived. The accuracy of the formula is sufficient for most practical purposes. A band-stop dielectric-disk resonator coupled to a propagating strip line is treated and the formula for external Q, Q sub ex, is derived. Response curves are given for three waveguide directional filters utilizing dielectric resonators, which in all cases verified directional filter behavior. The configurations tried were a pair of single-mode disks, one dual-mode disk, and two dual-mode disks. Several TEM-line directional filters also are discussed. External loading of the end resonators of a multiple disk band pass filter is studied in the case of a parallel plane boundary and formulas for Q sub ex are derived. Various techniques are described for joining band-pass and band-stop filters to form three-port diplexers.
- Electrical and Electronic Equipment