Dual mode band-pass filter

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

Reexamination Certificate

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Details

C333S219000

Reexamination Certificate

active

07119639

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.

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Al-Charchafchi et al.; “Frequency Splitting in Microstrip Rhombic Resonators”; IEEE Proceedings H. Microwaves, Antenna & Propagation; Institution of Electrical Engineers, Stevenage, GB; vol. 137, No. 3, Part H; Jun, 1, 1990; pp. 179-183.

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