Tunable electromagnetic wave resonant filter

Details Tunable electromagnetic wave resonant filter Tunable electromagnetic wave resonant filter

1997-05-12

1998-10-06

Ham, Seungsook

Wave transmission lines and networks

Resonators

Coaxial or shielded

333233, 333234, H01P 704

Patent

active

058183140

ABSTRACT:
There is disclosed a radio frequency device having a housing, a cover disposed atop the housing, and a rod. A fastener such as a nut is attached to the rod and engages the cover. When the fastener is rotated, the cover moves with respect to the housing, thereby changing the volume of the cavity defined by the housing. In this fashion, the device may be tuned to different frequencies. In alternative embodiments, the rod is internally threaded and receives a screw that engages the cover. When the screw is rotated, the volume of the cavity is changed and the device may be tuned.

REFERENCES:
patent: 2716222 (1955-08-01), Smullin
patent: 3121205 (1964-02-01), Foss
patent: 4728913 (1988-03-01), Ishikawa et al.
patent: 4730174 (1988-03-01), Nishikawa et al.
patent: 4963841 (1990-10-01), Sparagna
patent: 5311160 (1994-05-01), Higuchi et al.

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