Electronically tunable or modulatable resonant circuit

摘要

The circuit is coupled to a frequency-tuning element which generally consists of capacity diodes (D). The capacity diodes (D) are to be coupled to the resonant circuit (K) in such a manner that the effect of the diodes on the circuit Q is as little as possible and that there is no mutual influencing between tuning and modulation diodes. For this purpose, the invention provides a transformation line (L) with the characteristic impedance LL and the electrical length theta IL via which the frequency-determining element (D) is coupled to the resonant circuit (K). <IMAGE>