Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2005-02-01
2005-02-01
Tokar, Michael (Department: 2819)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S210000, C333S212000
Reexamination Certificate
active
06850131
ABSTRACT:
A highly compact bandpass filter that has excellent mechanical strength is disclosed. A bandpass filter according to the present invention employs a dielectric block of substantially rectangular prismatic shape constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on surfaces of the dielectric block. The first portion of the dielectric block and the metal plates formed thereon are enabled to act as an evanescent waveguide. The second portion of the dielectric block and the metal plates formed thereon are enabled to act as a first resonator. The third portion of the dielectric block and the metal plates formed thereon are enabled to act as a second resonator. The metal plates include an inductive stub formed on the surface of the first portion of the dielectric block.
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Nguyen Khai M.
Seed IP Law Group PLLC
TDK Corporation
Tokar Michael
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