Dielectric filter, antenna duplexer
US6965284B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2002 |
| Grant date | Nov 15, 2005 |
| Priority date | — |
| Expiry date | May 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P11/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.