Planar dual-mode cavity filters including dielectric resonators
US4652843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1984 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Nov 2, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2086
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A bandpass filter has a plurality of cascade cavities that operate in a dual-mode and are mounted in a planar relationship to one another. Each cavity contains a dielectric resonator and resonates at its resonant frequency in two HE.sub.11.delta. modes. An iris is located between adjacent cavities and contains an aperture that can independently control inter-cavity coupling. The dielectric resonator is cylindrical in shape and an adjustable metallic plunger is located in a wall of each cavity so that the cavity can be tuned over a relatively broad range. The filter has good mechanical and thermal stability as well as being extremely flexible in the arrangement of cavities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.