Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1998-05-22
2000-04-11
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333232, 333235, H01P 1208, H01P 706
Patent
active
060492619
ABSTRACT:
A device for changing the operating frequency of a microwave filter is mounted in a wall of a cavity of the filter. The device has a bellows that is located inside the cavity. The bellows contains an elongated member that extends outside the cavity to an actuator. The actuator can be temperature dependent and moves the elongated member either further into or further out of the cavity as desired. An interior end of the elongated member can be connected to the bellows or it can simply be in contact with the bellows without being connected. When the elongated member is in contact with the bellows and is not connected, when the elongated member moves outward, the bellows will return to a rest position due to its inherent spring. The bellows is sealed from an interior of the cavity. Filters using the device have one device located primarily for each mode in each cavity of the filter.
REFERENCES:
patent: 2103515 (1937-12-01), Conklin et al.
patent: 4521754 (1985-06-01), Ranghelli et al.
patent: 4675630 (1987-06-01), Tang et al.
Com Dev Ltd.
Ham Seungsook
Schnurr Daryl W.
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