INVESTIGATION OF MICROWAVE DIELECTRIC-RESONATOR FILTERS
Quarterly rept. no. 4, 1 Apr-31 Aug 1964
RANTEC CORP CALABASAS CA
Pagination or Media Count:
An analysis is given of the coupling coefficient between dielectric- disk resonators arranged axially along the center line of a rectangular metal tube below cutoff. As in the case of the transverse orientation of disk axes, a formula is obtained that is reasonably convenient for computation. The formula includes terms for all of the modes excited by the resonators. In the axial orientation case, the TE10 and TE01 modes do not contribute to coupling unless the disks are misaligned. The lowest order coupling terms are for the TE20 and TE02 modes. Formulas for the TE10 and TE01 coupling terms as a function of transverse and angular misalignments are given. These formulas are useful for determining mechanical positioning tolerances necessary in given filter designs. Experimental coupling-coefficient data are given for the axial orientation. Coupling coefficient versus center-to-center spacing was measured for a pair of dielectric disks in two different sizes of square tubing. Excellent agreement was found with curves computed from the couplingcoefficient formula.
- Electrical and Electronic Equipment