Method for maintaining constant bandwidth over a frequency spectrum in a dielectric resonator filter
US4559490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Dec 30, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2084
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and corresponding apparatus for maintaining constant bandwidth over a frequency spectrum in a microwave, dielectric resonator waveguide filter. Bandwidth is determined by the product of the resonant center frequency and the interresonator coupling coefficient. To maintain constant bandwidth while changing center frequency, the interresonator coupling coefficient must be chosen such that it varies inversely with changes in center frequency. The interresonator coupling coefficient is a function of the physical dimensions of the waveguide and the dielectric resonators, the dielectric constant and the spatial location of the resonators within the waveguide. Once the physical and spatial parameters have been established, the center frequency of the filter may be adjusted by altering the thickness of the resonators without changing the filter bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.