Laminated type dielectric filter
First Claim
1. A laminated type dielectric filter comprising:
- an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter;
a resonator means including at least a first stage symmetric type strip line resonator and a last stage symmetric type strip line resonator, each of said resonators having at least two resonating elements which have substantially the same configuration and are stacked one on the other with interposing a dielectric therebetween, and are aligned in a stacking direction in which said resonator elements are stacked, said resonators being aligned in a direction perpendicular to said stacking direction;
an input means having an input terminal coupled with said first stage symmetric type strip line resonator;
an output means having an output terminal coupled with said last stage symmetric type strip line resonator;
plural interlayer earth electrodes connected to the earth electrode; and
a coupling electrode coupling said plural symmetric type strip line resonators of the resonator means with each other;
wherein said resonating elements, earth electrode interlayer earth electrodes, and coupling electrode are mutually separated by means of dielectric layers.
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Accused Products
Abstract
A laminated type dielectric filter including a first stage symmetric type strip line resonator and a last stage symmetric type strip line resonator each having at least two resonating elements arranged to oppose one another via dielectric layers, said resonators being aligned in a direction perpendicular to a stacking direction in which said resonating elements are stacked, an input electrode for coupling the first stage symmetric type strip line resonator to an input terminal, an output electrode for coupling the last stage symmetric type dielectric filter to an output terminal, an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter, plural interlayer earth electrodes connected to the earth electrode, and one or more coupling electrode for coupling said plural symmetric type strip line resonators, said the resonating elements, input electrode, output electrode, interlayer earth electrodes and coupling electrodes are isolated by means of dielectric layers, and electrodes of at least one kind of electrode among the above mentioned electrodes are arranged between adjacent resonating elements such that capacitances between the resonating elements and these electrodes are increased to improve filter characteristics.
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Citations
35 Claims
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1. A laminated type dielectric filter comprising:
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an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter;
a resonator means including at least a first stage symmetric type strip line resonator and a last stage symmetric type strip line resonator, each of said resonators having at least two resonating elements which have substantially the same configuration and are stacked one on the other with interposing a dielectric therebetween, and are aligned in a stacking direction in which said resonator elements are stacked, said resonators being aligned in a direction perpendicular to said stacking direction;
an input means having an input terminal coupled with said first stage symmetric type strip line resonator;
an output means having an output terminal coupled with said last stage symmetric type strip line resonator;
plural interlayer earth electrodes connected to the earth electrode; and
a coupling electrode coupling said plural symmetric type strip line resonators of the resonator means with each other;
wherein said resonating elements, earth electrode interlayer earth electrodes, and coupling electrode are mutually separated by means of dielectric layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A laminated type dielectric filter comprising:
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an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter;
a resonator means including three sets of symmetric type strip line resonators constituting first stage, middle stage and last stage symmetric type strip line resonators, each of said resonators having first, second and third resonating elements which are stacked one another via dielectric layers, one end of the resonating elements of said resonators being connected to the ear electrode, the other end of said resonators being opened, and said resonators being aligned in a direction perpendicular to a stacking direction;
an input terminal directly connected to a tap portion formed on the second resonating elements of the first stage symmetric type strip line resonator;
an output terminal directly connected to a tap portion formed on the second resonating element of the last stage symmetric type strip line resonator;
twelve interlayer earth electrodes arranged such that open end portions of all the resonating elements of all three sets of symmetric type strip line resonators are sandwiched with the interlayer earth electrodes via dielectric layers, said interlayer earth electrodes being connected to said earth electrodes;
a first coupling electrode for coupling said first stage and middle stage symmetric type strip line resonators with each other, said first coupling electrode being arranged between the first and the second resonating elements of said first stage and middle stage symmetric type strip line resonators via dielectric layers; and
a second coupling electrode for coupling said middle stage and last stage symmetric type strip line resonators with each other arranged, said second coupling electrode being arranged between the second and third resonating elements of said resonators via dielectric layers.
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Specification