Dielectric filter having a plurality of TM multi-mode dielectric

Details Dielectric filter having a plurality of TM multi-mode dielectric Dielectric filter having a plurality of TM multi-mode dielectric

1997-06-25

1999-04-27

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

3332191, 333134, H01P 120, H01P 710

Patent

active

058983490

ABSTRACT:
A dielectric filter exhibiting excellent filter characteristics in which the manufacturing cost is reduced by forming coupling loops for dielectric resonators generally in the same shape. First through fourth TM double-mode dielectric resonators are aligned in a row with their openings facing in the same direction. First and second metallic panels are screwed to the resonators to cover their openings. An input loop and an output loop are mounted on the first panel in such a manner that they obliquely face the intersecting areas of the respective dielectric members of the first and fourth dielectric resonators, respectively. Also attached to the first panel are generally "V"-shaped coupling loops. Also disclosed is a dielectric duplexer constructed of a plurality of such dielectric filters.

REFERENCES:
patent: 5680080 (1997-10-01), Nishiyama et al.
patent: 5684438 (1997-11-01), Cavalieri D'Oro et al.
Patent Abstracts of Japan, vol. 96, No. 7, Jul. 31, 1996, JP 8-65005 A (Murata Mfg. Co., Ltd.), Mar. 8, 1996.
Patent Abstracts of Japan, vol. 96, No. 4, Apr. 30, 1996, JP 7-336103 A (Murata Mfg. Co., Ltd.), Dec. 22, 1995.
European Serach Report dated Nov. 2, 1998.
Singapore Search Report dated Oct. 13, 1998.

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