Temperature-compensated tuning screw for cavity filters
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United States of America Patent
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-
Aug 13, 1991
Grant Date -
N/A
app pub date -
Oct 31, 1988
filing date -
Oct 31, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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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