Dielectric filter, antenna duplexer

Details Dielectric filter, antenna duplexer Dielectric filter, antenna duplexer

2005-11-15

2005-11-15

Le, Dinh T. (Department: 2816)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S185000, C333S219000

Reexamination Certificate

active

06965284

ABSTRACT:
A dielectric filter includes resonator electrodes, an inter-stage coupling capacitor electrode, and an input/output coupling capacitor electrode on dielectric substrates, respectively. The resonator electrodes are electro-magnetically coupled to each other to form a tri-plate structure, are made of a metallic foil embedded in a resonator dielectric substrate. Another dielectric filter includes an upper shield electrode dielectric substrate, an inter-stage coupling capacitor dielectric substrate, a resonator dielectric substrate, and an input/output coupling capacitor dielectric substrate which are made of a composite dielectric material including a high-dielectric-constant material and a low-dielectric-constant material. The above described arrangement provides the dielectric filter with an improved Q factor of a resonator, a low loss, and a high attenuation.

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