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US 6,388,542 B2Granted
Dielectric filter, transmission-reception sharing unit, and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorsToshiro Hiratsuka, Tomiya Sonoda, Kenichi Iio
Life of this patent
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Abstract
A dielectric filter, a transmission-reception shared unit, and a transceiver, which incorporate the filter, are disclosed; in which spurious modes such as HE110 mode, HE210 mode, HE310 mode, etc., can be suppressed so as to improve blocking-band attenuation characteristics. The dielectric filter comprises a dielectric plate; electrodes having electrodeless parts, which are formed on both main surfaces of the dielectric plate so as to form dielectric resonators; and probes disposed parallel to the line along which the dielectric resonators are aligned.
Claims12
A dielectric filter comprising:
- a dielectric plate;
- a first electrode formed on a first main surface of the dielectric plate, parts of the electrode being electrodeless;
- a second electrode formed on a second main surface of the dielectric plate, parts of the second electrode opposed to the electrodeless parts of the first main surface being electrodeless;
- wherein the electrodeless parts of the dielectric plate form dielectric resonators;
- and wherein the dielectric resonators are aligned in a line;
- at least one linearly-formed coupling member which overlaps and is coupled with a specified one of the electric resonators;
- said line and said coupling member defining an angle which has a specified number of degrees other than 90 degrees.
4 more elements
A dielectric filter comprising:
- a dielectric plate;
- a first electrode formed on a first main surface of the dielectric plate, parts of the electrode being electrodeless;
- and
- a second electrode formed on a second main surface of the dielectric plate, parts of the second electrode opposed to the electrodeless parts of the first main surface being electrodeless;
- wherein the electrodeless parts of the dielectric plate form dielectric resonators;
- wherein at least one linearly-formed coupling member overlaps and is coupled with a specified one of the dielectric resonators;
- and
- wherein the dielectric resonators are disposed in such a manner that lines connecting the centers of respective adjacent dielectric resonators do not mutually coincide on the same line.
5 more elements
A duplexer comprising a pair of filters, one of said filters being used as a transmitting filter and the other of said filters being used as a receiving filter;
- the transmitting filter being connected between a transmitting signal input port and an I/O port;
- and the receiving filter being connected between a receiving signal output port and the I/O port, wherein at least one of said filters is a dielectric filter comprising:
- a dielectric plate;
- a first electrode formed on a first main surface of the dielectric plate, parts of the electrode being electrodeless;
- a second electrode formed on a second main surface of the dielectric plate, parts of the second electrode opposed to the electrodeless parts of the first main surface being electrodeless;
- wherein the electrodeless parts of the dielectric plate form dielectric resonators;
- and wherein the dielectric resonators are aligned in a line;
- at least one linearly-formed coupling member which overlaps and is coupled with a specified one of the dielectric resonators;
- said line and said coupling member defining an angle which has a specified number of degrees other than 90 degrees.
6 more elements
A transceiver comprising:
- a duplexer comprising a pair of filters, one of said filters being used as a transmitting filter and the other of said filters being used as a receiving filter;
- the transmitting filter being connected between a transmitting signal input port and an I/O port;
- and the receiving filter being connected between a receiving signal output port and the I/O port, wherein at least one of said filters is a dielectric filter comprising:
- a dielectric plate;
- a first electrode formed on a first main surface of the dielectric plate, parts of the electrode being electrodeless;
- a second electrode formed on a second main surface of the dielectric plate, parts of the second electrode opposed to the electrodeless parts of the first main surface being electrodeless;
- wherein the electrodeless parts of the dielectric plate form dielectric resonators;
- and
- wherein the dielectric resonators are aligned in a line;
- at least one linearly-formed coupling member which overlaps and is coupled with a specified one of the dielectric resonators;
- said line and said coupling member defining an angle which has a specified number of degrees other than 90 degrees,
- wherein a transmitting circuit is connected to the transmitting signal input port of the duplexer;
- a receiving circuit is connected to the receiving signal output port of the duplexer;
- and an antenna connector is connected to the I/O port of the duplexer.
11 more elements
A duplexer comprising a pair of filters, one of said filters being used as a transmitting filter and the other of said filters being used as a receiving filter, the transmitting filter being connected between a transmitting signal input port and an I/O port;
- and the receiving filter being connected between a receiving signal output port and the I/O port, wherein at least one of the filters is a dielectric filter comprising:
- a dielectric plate;
- a first electrode formed on a first main surface of the dielectric plate, parts of the electrode being electrodeless;
- and
- a second electrode formed on a second main surface of the dielectric plate, parts of the second electrode opposed to the electrodeless parts of the first main surface being electrodeless;
- wherein the electrodeless parts on the dielectric plate form dielectric resonators;
- wherein at least one linearly-formed coupling member overlaps and is coupled with a specified one of the dielectric resonators;
- and
- wherein the dielectric resonators are disposed in such a manner that lines connecting the centers of respective adjacent dielectric resonators do not mutually coincide on the same line.
6 more elements
A transceiver comprising:
- a duplexer comprising a pair of filters, one of said filters being used as a transmitting filter and the other of said filters being used as a receiving filter;
- the transmitting filter being connected between a transmitting signal input port and an I/O port;
- and the receiving filter being connected between a receiving signal output port and the I/O port, wherein at least one of said filters is a dielectric filter comprising:
- a dielectric plate;
- a first electrode formed on a first main surface of the dielectric plate, parts of the electrode being electrodeless;
- and
- a second electrode formed on a second main surface of the dielectric plate, parts of the second electrode opposed to the electrodeless parts of the first main surface being electrodeless;
- wherein the electrodeless parts on the dielectric plate form dielectric resonators;
- wherein at least one linearly-formed coupling member overlaps and is coupled with a specified one of the dielectric resonators;
- wherein the dielectric resonators are disposed in such a manner that lines connecting the centers of respective adjacent dielectric resonators do not mutually coincide on the same line;
- and
- wherein a transmitting circuit is connected to the transmitting signal input port of the duplexer;
- a receiving circuit is connected to the receiving signal output port of the duplexer;
- and an antenna connector is connected to the I/O port of the duplexer.
11 more elements
Dependencies are inferred from the claim text.