Wave transmission lines and networks – Resonators – Cavity resonator
Patent
1988-10-31
1991-08-13
Laroche, Eugene R.
Wave transmission lines and networks
Resonators
Cavity resonator
333232, 333234, H01P 130, H01P 706
Patent
active
050399667
ABSTRACT:
A temperature-compensated tuning screw (22) for use with a cavity filter (20) is provided. The tuning screw (22) has an elongate body (36) with a longitudinal bore (38). A compensating member (40) is positioned at least partially within the bore (38). At least one compensation bimetallic washer (44) deflects with decreasing temperature and causes the compensating member (40) to protrude further from the body (36). The compensation bimetallic washers (44) become flatter with increasing temperature and a coil spring (42) causes the compensating member (40) to be partially retracted into the bore (38). The movement of the compensating member (40) causes an overall length, L, of the tuning screw (22) to change. The tuning screw (22) can be screwed into a hole (32) in a cavity filter (20) so that the tuning screw (22) penetrates the cavity filter (20) a distance, P. A temperature-induced change in L, .DELTA.L, causes a change in P, .DELTA.P. The change in penetration, .DELTA.P, compensates for temperature-induced changes in the geometry of the cavity filter (20) and substantially corrects for a temperature-induced frequency drift, .DELTA.f'.
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Mannerstrom Leif R.
Schmid Hartmut
Glenayre Electronics Ltd.
LaRoche Eugene R.
Lee Benny
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