Back to results
US 7,119,639 B2Granted
Dual mode band-pass filter
AssigneeMurata Manufacturing Co., Ltd.
InventorsHisatake Okamura, Seiji Kanba, Naoki Mizoguchi
Life of this patent
Estimating the term…
Abstract
A dual mode band-pass filter includes a metallic film for defining a resonator, disposed on the first main surface of a dielectric substrate having first and second main surfaces, or inside of the dielectric substrate. An opening is formed in the metallic film. At least one ground electrode is provided on the second main surface of the dielectric substrate or inside of the dielectric substrate, so as to be opposed to the metallic film through a dielectric layer. A pair of input-output coupling circuits is connected to the metallic film.
Claims4
A dual mode band-pass filter comprising:
- a dielectric substrate having first and second main surfaces;
- a metallic film having an opening and disposed on the first surface of the dielectric substrate or inside of the dielectric substrate;
- at least one ground electrode disposed on the second main surface of the dielectric substrate or inside of the dielectric substrate, so as to be opposed to the metallic film through a dielectric layer;
- and
- a pair of input-output coupling circuits connected to different portions of the metallic film;
- wherein
- the shape of the metallic film is substantially rectangular including only four sides, the connection points of the input-output coupling circuits are located on opposite sides of said substantially rectangular metallic film, and the connection points of the input-output coupling circuits are located on one side of an imaginary straight line passing through center points of each of the opposite sides of the substantially rectangular metallic film.
4 more elements
Dependencies are inferred from the claim text.