MICROWAVE CIRCUIT - New Japan Radio Co., Ltd.

Title:

MICROWAVE CIRCUIT

Document Type and Number:

Japanese Patent JP3753883

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To suppress a change in an operating frequency due to ambient temperature at a low cost without using a circuit for a heart and its temperature control section or the like.
SOLUTION: A screw 22 is fastened to a casing 12 in a state such that the screw 22 is close to an open end of an open stub 14 surface-mounted on a dielectric board 13, and a thermal expansion coefficient of the kind of material of this screw 22 is selected smaller than a difference between a thermal expansion coefficient of the kind of material of the casing 12 and a thermal expansion coefficient of the kind of material of the dielectric board 13. For example, an aluminum (thermal expansion coefficient = 23) is employed for the casing 12, an alumina (thermal expansion coefficient = 6) is for the board 13 and an invar (thermal expansion coefficient = 1) is used for the screw 22. Thus, the frequency is kept constant because the screw 22 is parted from the open end of the open stub 14 resulting in causing a capacitance change when the frequency is decreased by the open stub 14 extended by a temperature change.

Inventors:

Kojiro Minamiya

Application Number:

JP5676399A

Publication Date:

March 08, 2006

Filing Date:

March 04, 1999

Export Citation:

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