Dual block ceramic resonator filter having common electrode defi

Details Dual block ceramic resonator filter having common electrode defi Dual block ceramic resonator filter having common electrode defi

1994-07-19

1997-03-25

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333206, 333222, 333207, H01P 1205

Patent

active

056148755

ABSTRACT:
A re-entrant dielectric ceramic resonator and filters incorporating a plurality thereof are suitable for use in mobile and portable radio transmitting and receiving devices. The inventive re-entrant dielectric ceramic resonator comprises a dielectric means comprised of a dielectric ceramic material having a top surface, a bottom surface and outer side surfaces, the top and bottom surfaces being flat and parallel to each other, the dielectric means further having a cylindrical hole extending partially from the top surface toward the bottom surface thereby forming an inner side surface and an inner bottom surface, the inner bottom surface being flat and parallel to the bottom surface. Furthermore, the top and outer side surfaces of the dielectric means and the inner side and inner bottom surfaces of the cylindrical hole are covered completely with a first conductive material, and the bottom surface of the dielectric means is partially covered with a second conductive material, to thereby form a coupling/tuning capacitor between the first conductive material covering the inner bottom surface and the second conductive material partially covering the bottom surface, whereby the re-entrant dielectric ceramic resonator is constructed.

REFERENCES:
patent: 4431977 (1984-02-01), Sokola
General Treatment of Klystron Resonant Cavities, Fujisawa, IRE Transactions on Microwave Theory and Techniques, Oct. 1958, pp. 344-358.

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