Plurality of resonator cavities coupled by inductive apertures which are adjusted by capacitive parts

摘要

One or more adjustable resonators (208, 209) of a compensation circuit are arranged so that adjusting the resonators nevertheless results in output of the circuit remaining substantially constant. This has been accomplished by separating resonator cavities that include the adjustable resonators by a partition wall. A coupling aperture (205) provides inductive coupling between the resonator cavities and a capacitive part (206) passes through the intermediate wall and provides a capacitive coupling between the resonator cavities. The capacitive part is conductive and electrically isolated from the partition wall. The capacitive part and the coupling aperture are dimensioned such that effects on the coupling band width of the aperture and capacitive couplings track each other so as to substantially cancel each other out, and that the coupling band width between the resonator cavities remains substantially constant.