Filter devices incorporating dielectric resonators and leakage c

Details Filter devices incorporating dielectric resonators and leakage c Filter devices incorporating dielectric resonators and leakage c

1978-06-27

1980-01-15

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, 333227, H03H 900, H01P 706

Patent

active

041841301

ABSTRACT:
A band rejection coaxial filter for use with a coaxial transmission line, for example, comprises a casing made of a conductive material and having an internal geometry selected to be in a cut off state with respect to the frequency of a signal being transmitted along the coaxial transmission line. The casing is coupled to the coaxial transmission line and a leakage coaxial cable is provided in the casing, so as to be coupled to the coaxial transmission line through the casing. The leakage coaxial cable is formed of a plurality of leakage openings spaced apart from each other a quarter wave length of the resonance frequency of the resonators in the axial direction for allowing for leakage of the transmission signal. A corresponding plurality of dielectric resonators are provided spaced apart a given distance from and faced to the leakage openings, so that a portion of the transmission signal of the frequency determined by the dielectric resonators is trapped.

REFERENCES:
patent: 3938064 (1976-02-01), O'Bryan, Jr. et al.
patent: 3986147 (1976-10-01), Carter et al.
patent: 4019161 (1977-04-01), Kimura et al.
patent: 4028652 (1977-06-01), Wakino et al.
patent: 4121181 (1978-10-01), Nishikawa et al.

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