Foreshortened coaxial resonators
AssigneeTektronix, Inc.
InventorRobert W. Alm
Life of this patent
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Abstract
A coaxial-structure filter which utilizes a flat depression machined in the bottom surface of the filter cover as the resonant frequency determining element in a resonant cavity is disclosed. The depression is directly above the cavity resonator post when the cover is installed and provides a lumped capacitance from the post to the cover. The resonator post is machined flush with the resonator's top wall thereby placing the critical mechanical dimensions associated with the frequency determining elements in a more desirable location than prior methods (i.e., in the filter cover).
Claims13
A foreshortened coaxial resonator, comprising:
- an electrically conductive body member having at least one cavity formed therein;
- at least one resonator means disposed in said cavity of said body member, said resonator means being the same height as the elevation of the wall of said cavity;
- and
- cover means having at least one depression formed in the bottom surface thereof said depression being aligned above said resonator when said cover means is placed over said cavity, said depression providing a lumped capacitance at the end of said resonator means.
An electrical filter comprising:
- an electrically conductive body member having at least one cavity therein;
- at least one resonator means disposed in said cavity, said resonator being the same height as the elevation of the wall of said cavity;
- detachable cover means having at least one flat-bottomed depression in the bottom surface thereof said depression aligned above said resonator when said cover means is placed over said cavity, said depression providing a lumped capacitance at the end of said resonator means;
- input means for applying electrical signals to the electrical filter;
- output means for removing electrical signals from said filter;
- and
- coupling means for electrically coupling said input means, said resonator means and said output means in series.
A foreshortened coaxial resonator, comprising:
- an electrically conductive housing including a body member having a cavity opening into a surface thereof, and means secured to said body surface for covering said cavity;
- and
- a resonator post disposed within said cavity, one end of said post terminating at the cavity's surface opening,
- said covering means including means defining a recess opposite said end of the resonator post for providing a lumped capacitance at one end of said resonator.
Dependencies are inferred from the claim text.