TM dual mode dielectric resonator and filter utilizing a hole to

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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3332191, 333208, H01P 1208, H01P 710

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active

057084041

ABSTRACT:
In a TM dual mode dielectric resonator apparatus, a cross-shaped TM dual mode dielectric resonator is provided in an electrically conductive case, wherein the TM dual mode dielectric resonator comprises first and second dielectric resonators integrally formed so as to be perpendicular to each other, and coupling grooves for coupling an operation mode of the first dielectric resonator with an operation mode of the second dielectric resonator are formed in the TM dual mode dielectric resonator. Cross-sectional areas or sizes such as thickness, widths or the like, of the first and second dielectric resonators are set so as to be different from each other. Alternatively, a hole for adjusting the resonance frequency is formed at an end of one of the first and second dielectric resonators so as to penetrate the same.

REFERENCES:
patent: 4642591 (1987-02-01), Kobayashi
patent: 5078621 (1992-01-01), Nishikawa et al.
patent: 5336112 (1994-08-01), Michishita et al.
Ishikawa, Y. et al. "800 MHz High Power Duplexer Using TM Dual Mode Dielectric Resonators"; 1992 MIT-S Digest, vol. 3; 1-5 Jun. 1992 Alberquerque N.M.; pp. 1617-1620.
Conference Proceedings of the 19th European Microwave Conference 1989, 4-7 Sep. 1989, Tunbridge Wells, Great Britain, pp. 886-891, "4GHz Band Band-Pass Filter Using an Orthogonal Array Coupling TM110 Dual Mode Dielectric Resonator", T. Nishikawa, et al.
U.S. Patent Application No. 08/335,043 filed Nov. 7, 1994.
U.S. Patent Application No. 08/339,542 filed Nov. 15, 1994.

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