Adjustable capacitive coupling structure
AssigneeRadio Frequency Systems, Inc.
InventorBill Engst
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Abstract
A cavity filter which provides for fine tuning of the bandwidth of the filter. The filter provides for both capacitive cross-coupling and inductive coupling between physically adjacent but electrically non-adjacent resonators in the filter. The isolation of the filter can be fine tuned by adjusting the inductive coupling between these resonators, which has the effect of attenuating the cross-coupling effect between these resonators.
Claims17
A cavity filter comprising:
- a filter housing, said housing having at least first and second cavities separated by a cavity wall;
- a filter cover for covering said filter housing;
- and
- a plurality of resonators respectively disposed in said cavities, wherein first and second resonators, of said plurality of resonators, are coupled to each other by both an inductive coupler and a capacitive cross-coupler.
A method of tuning the frequency response of the bandwidth of a cavity filter that includes a filter housing, a filter cover for covering said filter housing, a plurality of resonators respectively disposed in cavities, an inductive coupler that includes a tuner, and a capacitive cross-coupler;
- said method comprising:
- adjusting the capacitive cross-coupling effect between said resonators by adjusting the inductive coupler.
A method of tuning the frequency response of the bandwidth of a cavity filter that includes a filter housing with a plurality of resonators, comprising the step of adjusting the capacitive cross-coupling effect between said resonators by externally adjusting the inductive coupling.
Dependencies are inferred from the claim text.