Title:
CERAMIC LOADED TEMPERATURE COMPENSATING TUNABLE CAVITY FILTER
Document Type and Number:
WIPO Patent Application WO2006012055
Kind Code:
A3
Abstract:
A high Q RF cavity resonator loaded with a ceramic disc, the resonator comprising an inner conductive post having a length less than a quarter wavelength. The resonance frequency of the resonator is tunable by changing a distance between a) an outer plate and b) a ceramic disc and an end cap where the ceramic disc is located between the outer plate and the end cap. The resonance frequency can be tuned when the outer plate, ceramic disc, and end cap are in contact with each other by varying a pressure between the contact surfaces of the ceramic disc, the end cap and the outer plate. Temperature compensation allows the resonator to hold a resonance frequency despite changes in temperature, and can be achieved by selecting thermal coefficients of expansion of components holding or placing the ceramic disc and end cap relative to the outer plate.
Inventors:
D OSTILIO JAMES P (US)
Application Number:
PCT/US2005/021491
Publication Date:
June 08, 2006
Filing Date:
June 20, 2005
Export Citation:
Assignee:
MICROWAVE CIRCUITS INC (US)
D OSTILIO JAMES P (US)
D OSTILIO JAMES P (US)
International Classes:
H01P7/04
Foreign References:
| US4477786A | 1984-10-16 | |||
| US4389624A | 1983-06-21 |
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