Resonator filters on dielectric substrates
First Claim
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1. A resonator filter comprising:
- a dielectric; and
a pair of first and second electrodes electrically confronting each other through said dielectric, each of said first and second electrodes having at least one bent portion to present primarily a lumped-constant inductance and having a desired equivalent electrical length,said first and second electrodes having ground or common terminals located out of mutually confronting positions so that voltage signals induced by mutual induction between said electrodes will be opposite in phase with respect to each other, thereby producing a parasitic distributed-constant capacitance due to a potential difference between said electrodes and a dielectric constant of said dielectric; and
said first electrode having a first terminal at a desired position thereof so that said electrodes form a two-terminal circuit network having said first terminal with said ground or common terminals serving as a second terminal, said two-terminal circuit network forming an equivalent parallel resonant bandpass filter circuit composed of a lumped-constant inductor formed by said first electrode and a parasitic distributed-constant capacitor between said first and second electrodes.
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Abstract
A resonator filter has electrodes disposed in a confronting relationship to each other and has a dielectric base plate interposed therebetween. The filter has ground or common terminals on the electrode portions in different positions which do not include mutually confronting electrode portions. The electrodes have spiral configurations or configurations having at least one bent portion such that the electrodes have a lumped-constant inductance. Voltage signals induced in the electrodes due to mutual induction therebetween are opposite in phase with respect to each other and a parasitic distributed-constant capacitance is produced due to a potential difference between the electrodes and a dielectric constant of the dielectric base plate. As a consequence thereof, a two-terminal parallel resonance band pass filter circuit is formed on an equivalent basis which is composed of the lumped-constant inductance of one of the electrodes and the distributed-constant capacitance between the electrodes. The parallel resonance band pass filter has a resonance frequency which is lower than a frequency having its 1/4 wavelength equal to an equivalent electrical length of each electrode.
50 Citations
23 Claims
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1. A resonator filter comprising:
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a dielectric; and a pair of first and second electrodes electrically confronting each other through said dielectric, each of said first and second electrodes having at least one bent portion to present primarily a lumped-constant inductance and having a desired equivalent electrical length, said first and second electrodes having ground or common terminals located out of mutually confronting positions so that voltage signals induced by mutual induction between said electrodes will be opposite in phase with respect to each other, thereby producing a parasitic distributed-constant capacitance due to a potential difference between said electrodes and a dielectric constant of said dielectric; and said first electrode having a first terminal at a desired position thereof so that said electrodes form a two-terminal circuit network having said first terminal with said ground or common terminals serving as a second terminal, said two-terminal circuit network forming an equivalent parallel resonant bandpass filter circuit composed of a lumped-constant inductor formed by said first electrode and a parasitic distributed-constant capacitor between said first and second electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A resonator filter comprising:
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a dielectric; and a pair of first and second electrodes disposed on opposite surfaces of said dielectric respectively so as to electrically confront each other through said dielectric, each of said first and second electrodes having at least one bent portion to present primarily a lumped-constant inductance and having a desired equivalent electrical length, said first and second electrodes having ground or common terminals located out of mutually confronting positions so that voltage signals induced by mutual induction between said electrodes will be opposite in phase with respect to each other, thereby producing a parasitic distributed-constant capacitance due to a potential difference between said electrodes and a dielectric constant of said dielectric; and
said first electrode having a first terminal at a desired position thereof so that said electrodes form a two-terminal circuit network having said first terminal with said ground or common terminals serving as a second terminal, said two-terminal circuit network forming an equivalent parallel resonant bandpass filter circuit composed of a lumped-constant inductor formed by said first electrode and a parasitic distributed-constant capacitor between said first and second electrodes. - View Dependent Claims (13, 14, 15, 16)
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17. A resonator filter comprising:
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a dielectric plate; and a pair of first and second electrodes disposed on opposite surfaces of said dielectric plate respectively so as to electrically confront each other through said dielectric plate, each of said first and second electrodes having a spiral shape to present primarily a lumped-constant inductance and having a desired equivalent electrical length, said first and second electrodes having ground or common terminals located out of mutually confronting positions so that voltage signals induced by mutual induction between said electrodes will be opposite in phase with respect to each other, thereby producing a parasitic distributed-constant capacitance due to a potential difference between said electrodes and a dielectric constant of said dielectric; and said first electrode having a first terminal at a desired position thereof so that said electrodes form a two-terminal circuit network having said first terminal with said ground or common terminals serving as a second terminal, said two-terminal circuit network forming an equivalent parallel resonant bandpass filter circuit composed of a lumped-constant inductor formed by said first electrode and a parasitic distributed-constant capacitor between said first and second electrodes. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsKane, Johji
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Primary Examiner(s)Nussbaum, Marvin L.
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Application NumberUS06/627,727Time in Patent Office819 DaysField of Search333/167, 333/156, 333/174-176, 333/181-185, 333/202, 333/204, 333/205, 333/219-221, 361/402, 336/200US Class Current333/174CPC Class CodesH03H 5/02 without voltage- or current...
