Dielectric filter having interstage coupling using adjacent elec

Details Dielectric filter having interstage coupling using adjacent elec Dielectric filter having interstage coupling using adjacent elec

1994-02-25

1996-03-12

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333206, 333222, H01P 1205

Patent

active

054990041

ABSTRACT:
A dielectric filter comprises a pair of dielectric resonators 11 and 12, which have outer conductors 11c and 12c formed with cutouts 11k and 12k, respectively. Interstage coupling electrodes 11f and 12f are provided within the region of these cutouts 11k and 12k, so that the electrodes 11f and 12f do not contact with the conductors, such as outer conductors 11c, 12c and the inner conductors 11d, 12d. The dielectric resonators are connected in such a manner that these electrodes 11f and 12f are brought into contact with each other. Furthermore, input/output coupling electrodes 11g and 12g are provided within the region of the cutouts 11k and 12k. Then, by connecting the electrodes 11f and 12f, it becomes possible to provide a dielectric filter which is compact in size and capable of reducing the number of parts and, therefore, cheap in cost.

REFERENCES:
patent: 4673902 (1987-06-01), Takeda et al.
patent: 4733208 (1988-03-01), Ishikawa et al.
patent: 5130683 (1992-07-01), Agahi-Kesheh et al.
patent: 5146193 (1992-09-01), Sokola
Hano et al., "A Bandpass Filter Using Direct--Coupled . . . Resonators", Microwave Journal, Nov. 1987, pp. 141-143, 145, 147, 148, 150, 152, 154, 156, 158, 160.

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