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US 6,556,108 B2Granted
Method of producing band-pass filter and band-pass filter
AssigneeMurata Manufacturing Co., Ltd.
InventorsSeiji Kanba, Naoki Mizoguchi, Hisatake Okamura
Life of this patent
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Abstract
A method of producing a band-pass filter includes selecting the shape of a metallic film and the connection points of input-output coupling circuits such that first and second resonance modes are generated in a metallic film provided on a dielectric substrate. At least a portion of the resonance current or the resonance electric field in at least one of the resonance modes is made discontinuous such that the first and second resonance modes are coupled.
Claims12
A band-pass filter comprising:
- a dielectric substrate;
- at least one metallic film provided on a surface of the dielectric substrate or inside of the dielectric substrate;
- input-output coupling circuits connected to first and second portions of the periphery of the metallic film, wherein the shape of the metallic film and the positions of connection points of the input-output coupling circuits are such that a first resonance mode propagated substantially parallel to an imaginary straight line passing through the connection points of the input-output coupling circuits, and a second resonance include propagated substantially perpendicular to the imaginary straight line are generated;
- and
- a coupling mechanism arranged to make discontinuous at least a portion of a resonance current or a resonance electric field such that the first and second resonance modes are coupled to each other;
- wherein
- the shape of the metallic film is substantially triangular and the connection points of the input-output coupling circuits are located on adjacent sides of said substantially triangular metallic film.
4 more elements
A band-pass filter comprising:
- a dielectric substrate;
- at least one metallic film provided on a surface of the dielectric substrate or inside of the dielectric substrate;
- input-output coupling circuits connected to first and second portions of the periphery of the metallic film, wherein the shape of the metallic film and the positions of connection points of the input-output coupling circuits are such that a first resonance mode propagated substantially parallel to an imaginary straight line passing through the connection points of the input-output coupling circuits, and a second resonance mode propagated substantially perpendicular to the imaginary straight line are generated;
- and
- a coupling mechanism arranged to make discontinuous at least a portion of a resonance current or a resonance electric field such that the first and second resonance modes are coupled to each other;
- wherein
- the shape of the metallic film is substantially rhomboid and the connection points of the input-output coupling circuits are located on adjacent sides of said substantially rhomboid metallic film.
4 more elements
Dependencies are inferred from the claim text.