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US 4,728,913 AGranted
Dielectric resonator
AssigneeMurata Manufacturing Co., Ltd.
InventorsYouhei Ishikawa, Hidekazu Wada, Kouichi Takehara
Life of this patent
Estimating the term…
Abstract
A dielectric resonator comprises a shield electrode defining a resonant space and cylindrical dielectric resonator element disposed and supported fixedly in the resonant space, to which an input and output are coupled. Into the hollow portion of the dielectric resonator element, a tuning unit made of a dielectric material is inserted so as to be displaceable in an axial direction therein. The tuning unit is coupled to a supporting axis which is displaceable axially, thus causing the tuning unit to displace in that direction. A resonance frequency of the dielectric resonator varies as the tuning unit displaces.
Claims14
A dielectric resonator, comprising:
- (a) a shielded casing defining a shielded space, said shielded casing comprising:
- (1) a hollow case, a metallic shield electrode being formed on a surface of said case,
- (2) a cover plate and a bottom plate for respectively closing top and bottom ends of said hollow case, said cover and bottom plates having metallic shield electrodes formed on surfaces thereof, said shield electrodes of said cover and bottom plates conductively contacting said shield electrode of said hollow case,
- (b) a dielectric resonator element secured within said shielded space, a penetrating hole being formed in said dielectric resonator element, penetrating said dielectric resonator element in an axial direction thereof,
- (c) a tuning unit comprising a dielectric material and disposed in said penetrating hole, and being displaceable in the axial direction,
- (d) a supporting rod to which said tuning unit is secured, said supporting rod being held at end portions thereof by said cover plate and said bottom plate so as to penetrate said penetrating hole of said dielectric resonator for supporting said tuning unit, and
- (e) displacing means for acting on said supporting rod so as to displace said tuning unit in said axial direction;
- wherein said dielectric resonator element is formed as a hollow cylinder;
- wherein said displacing means includes screw means mounted on said shielded casing and associated with said supporting rod for being turned to displace said tuning unit;
- and
- wherein said screw means comprises an internal thread formed on said tuning unit, said supporting rod passing axially through said tuning unit, at least one end of said supporting rod being rotatable from the outside of said shielded casing, and said supporting rod being provided with an external thread which is screwed into said internal thread on said tuning unit.
8 more elements
A dielectric resonator, comprising:
- (a) a shielded casing defining a shielded space, said shielded casing comprising:
- (1) a hollow case, a metallic shield electrode being formed on a surface of said case,
- (2) a cover plate and a bottom plate for respectively closing top and bottom ends of said hollow case, said cover and bottom plates having metallic shield electrodes formed on surfaces thereof, said shield electrodes of said cover and bottom plates conductively contacting said shield electrode of said hollow case,
- (b) a dielectric resonator element secured within said shielded space, a penetrating hole being formed in said dielectric resonator element, penetrating said dielectric resonator element in an axial direction thereof,
- (c) a tuning unit comprising a dielectric material and disposed in said penetrating hole, and being displaceable in the axial direction,
- (d) a supporting rod to which said tuning unit is secured, said supporting rod being held at end portions thereof by said cover plate and said bottom plate so as to penetrate said penetrating hole of said dielectric resonator for supporting said tuning unit, and
- (e) displacing means for acting on said supporting rod so as to displace said tuning unit in said axial direction;
- wherein said dielectric resonator element is formed as a hollow cylinder;
- wherein said displacing means includes screw means mounted on said shielded casing and associated with said supporting rod for being turned to displace said tuning unit;
- and
- which further comprises rotation control means for controlling said tuning unit to prevent rotation thereof as said screw means is turned.
8 more elements
A dielectric resonator, comprising:
- (a) a shielded casing defining a shielded space, said shielded casing comprising:
- (1) a hollow case, a metallic shield electrode being formed on a surface of said case,
- (2) a cover plate and a bottom plate for respectively closing top and bottom ends of said hollow case, said cover and bottom plates having metallic shield electrodes formed on surfaces thereof, said shield electrodes of said cover and bottom plates conductively contacting said shield electrode of said hollow case,
- (b) a dielectric resonator element secured within said shielded space, a penetrating hole being formed in said dielectric resonator element, penetrating said dielectric resonator element in an axial direction thereof,
- (c) a tuning unit comprising a dielectric material and disposed in said penetrating hole, and being displaceable in the axial direction,
- (d) a supporting rod held at end portions thereof by said cover plate and said bottom plate so as to penetrate said penetrating hole of said dielectric resonator for supporting said tuning unit, said supporting rod comprising a dielectric material having a lower dielectric constant than that of said dielectric material of said tuning unit, and
- (e) displacing means for acting on said supporting rod so as to displace said tuning unit in said axial direction.
4 more elements
Dependencies are inferred from the claim text.