Dielectric resonator, dielectric filter and method of producing the same, filter device combined to a transmit-receive antenna and communication apparatus using the same
First Claim
1. A dielectric resonator including a pair of dielectric substrates opposed to each other and resonator electrodes disposed between the pair of dielectric substrate, wherein the resonator electrodes are disposed so as to be brought into direct contact with major surfaces of the pair of dielectric substrates, and a bonding layer is disposed around the resonator electrodes so as to bond the pair of dielectric substrates.
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Accused Products
Abstract
There is provided a dielectric resonator including a pair of dielectric substrates opposed to each other and resonator electrodes disposed between the pair of dielectric substrate, wherein the resonator electrodes are disposed so as to be brought into contact with major surfaces of the pair of dielectric substrates, and a bonding layer is disposed around the resonator electrodes so as to bond the pair of dielectric substrates. The pair of dielectric substrates have been in advance sintered at sufficiently high temperature which is a dielectric having an fQ value at 1 GHz in the range of 3×103 to 1×105, then achieve a high Q value as a filter. The pair of the substrates are provided with the surface roughness of a range of 0.1 to 2.0 μm, and flatness of 10 μm or less between both ends thereof to bring the resonant electrodes in close contact with the surfaces of the substrate. Such ceramic filters are used comfortably for a filter connecting a transmit-receive antenna to a transmitter and receiver, which can provide communication equipment having a good high frequency performance for cellular telephone systems.
58 Citations
24 Claims
- 1. A dielectric resonator including a pair of dielectric substrates opposed to each other and resonator electrodes disposed between the pair of dielectric substrate, wherein the resonator electrodes are disposed so as to be brought into direct contact with major surfaces of the pair of dielectric substrates, and a bonding layer is disposed around the resonator electrodes so as to bond the pair of dielectric substrates.
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12. A method of producing a dielectric resonator comprising steps of:
- facing the main surfaces of a pair of dielectric substrates sintered from a dielectric opposed to each other;
interposing resonator electrodes made of a metal foil therebetween and integrally bonding these; and
filling a space around the resonator electrodes between the pair of dielectric substrates with an adhesive and curing the adhesive by heating to form a bonding layer. - View Dependent Claims (19)
- facing the main surfaces of a pair of dielectric substrates sintered from a dielectric opposed to each other;
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13. A method of producing a dielectric resonator comprising steps of:
- printing a pattern of an adhesive to be used as a bonding layer on a main surface of one dielectric substrate sintered from a dielectric except for regions in which resonator electrodes are to be formed;
curing the adhesive in a B stage and printing a conductive paste to be used as resonator electrodes in the regions in which the resonator electrodes are to be formed; and
placing a main surface of the other dielectric substrate sintered from a dielectric on the surface of the dielectric substrate on which the adhesive is provided, applying pressure while heating to the pair of dielectric substrates to completely cure the adhesive from a B stage and the conductive paste so that the pair of dielectric substrates, the bonding layer and the resonator electrode are integrally bonded.
- printing a pattern of an adhesive to be used as a bonding layer on a main surface of one dielectric substrate sintered from a dielectric except for regions in which resonator electrodes are to be formed;
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14. A method of producing a dielectric resonator comprising steps of:
- forming an electrode carrier film composed of a resin sheet provided with punched portions each having a shape larger than the shape of a resonator electrode and resonator electrodes which are made of a metal foil and inserted into the punched portions;
interposing the electrode carrier film between a pair of dielectric substrates obtained by sintering a dielectric while their one main surfaces are opposed to each other;
applying pressure and heat to the pair of dielectric substrates to completely cure the resin sheet and thereby form a bonding layer so that the pair of dielectric substrates, the resonator electrodes and the bonding layer are integrally laminated; and
cutting the laminate to separate into dielectric resonators. - View Dependent Claims (15, 16, 17, 18, 20, 23, 24)
- forming an electrode carrier film composed of a resin sheet provided with punched portions each having a shape larger than the shape of a resonator electrode and resonator electrodes which are made of a metal foil and inserted into the punched portions;
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22. A method of producing a dielectric filter comprising steps of:
- disposing an interstage coupling capacitor electrode between two dielectric ceramic green sheets laminated in a predetermined thickness and sintering these to form a dielectric substrate;
disposing an input/output coupling capacitor electrodes between another pair of dielectric ceramic green sheets similarly laminated in a predetermined thickness and sintering these to form a dielectric substrate;
interposing resonator electrodes between the dielectric substrate including the interstage coupling capacitor and the dielectric substrate including the input/output coupling capacitors;
filling a thermosetting resin adhesive around the resonator electrodes in a space between both the substrates; and
applying pressure while heating to both the dielectric substrates to cure the adhesive and thereby form a bonding layer, integrating the dielectric substrates with the resonator electrodes.
- disposing an interstage coupling capacitor electrode between two dielectric ceramic green sheets laminated in a predetermined thickness and sintering these to form a dielectric substrate;
Specification