CONTROLLED STEPPED ATTENUATOR Russian patent published in 2014 - IPC H01P1/22 

FIELD: radio engineering, communication.

SUBSTANCE: controlled stepped attenuator, the input and output of which are formed by two parallel-connected sections of a transmission line, one of which is in form of three series-connected quarter-wave sections of a line, shunted at connection points by diodes which are connected via direct current in polarity at a quarter-wave distance to the input and output, the free electrodes of which are connected to quarter-wave sections of the line; the second section of the transmission line includes a signal attenuation unit, which is connected at the same distance from the input and output, wherein the second section of the transmission line is shunted by diodes, connected in one polarity, at a quarter-wave distance from the input and output through quarter-wave sections of a line, wherein the free electrodes of the diodes shunting the second section are earthed, wherein all diodes of the attenuator are connected via direct current in one polarity.

EFFECT: controlling an attenuator with one control signal which reaches all diodes at the same time, while maintaining low transmission losses and the same phase-frequency response in the forward and by-pass paths.

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