Filter with temperature compensated tuning screw

Details Filter with temperature compensated tuning screw Filter with temperature compensated tuning screw

H - Electricity

01

P

H01P 1/30 (2006.01) H01P 1/208 (2006.01) H01P 7/06 (2006.01)

Patent

CA 2206942

A temperature compensated filter has a compensating screw mounted in a support in the wall of a cavity. The support is made from a material having a high coefficient of thermal expansion compared to the material of the cavity and the material of the compensating screw. As temperature changes, the support moves the compensating screw either further into the cavity or further out of the cavity to compensate for the change in resonant frequency of the cavity that would otherwise occur. The compensating screw can be used with single, dual or triple mode cavities. The compensating screw can be made of metallic material or it can be made of non-metallic material with a metallic outer surface. The compensating screw is locked in the support before the support is inserted into the wall of the cavity. The support is then locked in the wall of the cavity and the screw automatically changes position within the cavity as temperature changes. An RF barrier can be used to prevent RF energy from the cavity from entering the area of the support.

Filtre à réglage stabilisé en température avec vis de compensation montée sur un support situé dans la paroi d'une cavité. Le support est fait d'un matériau ayant un haut coefficient de dilatation thermique si on le compare au matériau de la cavité et de la vis de compensation. mesure que la température change, le support fait enfoncer ou ressortir la vis de compensation de la cavité pour compenser le changement de la fréquence de résonance de la cavité qui se produirait autrement. La vis de compensation peut être utilisée dans des cavités à mode simple, double ou triple. La vis de compensation peut être faite d'un matériau métallique, ou d'un matériau non métalique avec une surface externe métallique. La vis de compensation est fixée au support avant que celui-ci ne soit inséré dans la paroi de la cavité. Le support est ensuite fixé dans la paroi de la cavité et la vis change automatiquement de position dans la cavité, à mesure que la température varie. Une barrière RF peut être utilisée pour empêcher l'énergie RF provenant de la cavité de pénétrer dans la zone du support.

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