Dielectric filter

Details Dielectric filter Dielectric filter

1998-01-12

1999-08-31

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333222, H01P 1205, H01P 704

Patent

active

059458968

ABSTRACT:
Stronger electromagnetic coupling than in conventional devices can be provided between adjacent resonator holes in a dielectric filter or a dielectric duplexer without changing the external shape and dimensions of a dielectric block. Resonator holes pass through opposing surfaces of a dielectric block, each including a large-diameter hole section and a small-diameter hole section. The small-diameter hole sections may be formed near a short-circuit end face of the dielectric block. The large-diameter hole sections and the small-diameter hole sections are connected to each other with their axes shifted from each other. The radius R of the large-diameter hole sections, the radius r of the small-diameter hole sections, and the shift distance P between the axes of the large-diameter hole sections and those of the small-diameter hole sections satisfy the expression R-r<P<R+r.

REFERENCES:
patent: 5712648 (1998-01-01), Tsujiguchi
patent: 5764118 (1998-06-01), Saito et al.
Patent Abstracts of Japan, vol. 17, No. 676 (E-1475), Dec. 13, 1993 & JP 05 226909 A (Sony Chem Corp.) Sep. 3, 1993, abstract; figure 3.

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