Resonator device, filter, composite filter device, duplexer, and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorsJun Hattori, Hiroki Wakamatsu, Hiroyuki Kubo, Kenji Saito
Life of this patent
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Abstract
In a cavity body, a conductor rod is provided with least one end thereof being electrically connected to the cavity. A dielectric core is disposed in the cavity and the conductor rod extends through a hole in the dielectric core. With this structure, the cavity and the conductor rod constitute a resonator which operates in the quasi-TEM mode of a re-entrant cylindrical cavity resonator. The cavity and the dielectric core constitute a resonator which operates in the quasi-TM mode.
Claims20
A resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole.
A filter comprising:
- a resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole;
- an input-output conductor which is coupled to a predetermined mode of said resonance modes and is thereby operable to carry out input-output of a signal to and from said resonator device.
A communication device comprising:
- a transmission circuit;
- a reception circuit;
- and
- a filter connected to at least one of said transmission circuit and said reception circuit, said filter comprising:
- a resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole;
- and
- an input-output conductor which is coupled to a predetermined mode of said resonance modes and is thereby operable to carry out input-output of a signal to and from said resonator device.
A communication device comprising:
- a transmission circuit;
- a reception circuit;
- and
- a composite filter device connected to at least one of said transmission circuit and said reception circuit, said composite filter device comprising:
- a resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole;
- and
- an input-output conductor which is coupled to a predetermined mode of said resonance modes and is thereby operable to carry out input-output of a signal to and from said resonator device.
A communication device comprising:
- a transmission circuit;
- a reception circuit;
- and
- a duplexer connected to said transmission circuit and said reception circuit, said duplexer comprising:
- first and second filters, each of said filters comprising:
- a resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole;
- and
- at least one input-output conductor which is coupled to a predetermined mode of said resonance modes and is thereby operable to carry out input-output of a signal to and from said resonator device;
- each said filter having an input port and an output port, each being connected to a respective input-output conductor of said filter;
- the input port of the first filter being a transmission input port for inputting a transmission signal, the output port of the second filter being a reception output port for outputting a reception signal, the output port of the first filter being connected to the input port of the second filter for providing an antenna port;
- said transmission circuit being connected to said transmission input port, and said reception circuit being connected to said reception output port.
A composite filter device comprising a plurality of filters, each said filter comprising:
- a resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole;
- and
- an input-output conductor which is coupled to a predetermined mode of said resonance modes and is thereby operable to carry out input-output of a signal to and from said resonator device.
A method of producing a resonator device comprising a conductive rod provided in a conductive cavity with at least one end of the rod being electrically connected to the cavity, and a dielectric core having a hole provided in the cavity, wherein a resonance frequency in a resonance mode determined by the cavity and the rod and a resonance frequency in a resonance mode determined by the cavity and the dielectric core are set substantially equal to each other and wherein the rod extends through the hole;
- said method comprising the steps of:
- selecting a material for the dielectric core such that a change of the resonance frequency in the resonance mode determined by the cavity and the dielectric core is substantially constant for changes in temperature,
- selecting a material for the rod such that a change of the resonance frequency in the resonance mode determined by the cavity and the rod is substantially constant for changes in temperature, and
- assembling said resonator device with the selected materials.
Dependencies are inferred from the claim text.