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US 5,216,388 AGranted
Microwave oscillator with temperature compensation
AssigneeDetection Systems, Inc.
InventorWilliam S. Dipoala
Life of this patent
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AssigneeDetection Systems, Inc.
InventorWilliam S. Dipoala
Estimating the term…
A microwave oscillator includes a metal housing which defines a cavity in which microwave radiation is produced by an internally mounted Gunn diode or the like. A tuning member projects into the microwave cavity through a hole formed in a wall of the oscillator housing. Depending on the length of its projection into the cavity, the tuning member controls the frequency of the microwave energy produced by the oscillator. The tuning member is supported on the cavity housing by a mounting member made from a material having a relatively high coefficient of thermal expansion. Particularly preferred materials include polymers such as polyethylene and polypropylene. Preferably, a microwave filter or choke is provided to reduce the leakage of microwave energy from the cavity through the hole in the oscillator housing. Such a choke comprises a pair of capacitors separated by an inductor. These elements are defined by (a) a portion of the oscillator housing, (b) the tuning screw (which is given a special cross-sectional contour), and (c) a sleeve of dielectric material, such as Teflon, which surrounds the tuning member.
A microwave oscillator comprising a housing which defines a cavity in which microwave radiation is produced by an internally mounted source of microwave energy, a tuning screw projecting into the microwave cavity through a hole formed in a wall of said housing, the length of the projection of said screw into the cavity determining, in part, the frequency of the microwave energy produced by said oscillator, a threaded support member mounted on said housing for supporting said screw in a position such that said screw projects through said hole and into said cavity, said support member and said housing being comprised of different materials having substantially different coeffecients of thermal expansion, and a microwave filter for reducing the leakage of microwave energy from said cavity through said hole in the microwave housing.
A microwave oscillator comprising a zinc housing which defines a cavity in which microwave radiation is produced by an internally mounted Gunn diode, a tuning member projecting into the microwave cavity through a hole formed in a wall of said housing, the length of the projection of said member into the cavity determining, in part, the frequency of the microwave energy produced by said oscillator, a support member mounted on said housing for supporting said screw in a fixed position such that said member projects a predetermined fixed distance through said hole and into said cavity, said support member and said housing being comprised of different materials having substantially different coeffecients of thermal expansion, and a microwave filter for reducing the leakage of microwave energy from said cavity through said hole in the microwave housing.
The microwave oscillator as defined by 7 wherein said tuning member is threaded into said support member.
A microwave oscillator comprising:
A microwave oscillator comprising:
Dependencies are inferred from the claim text.