Variable reactance attenuation network controlled by control voltage

Claim 1

A VARIABLE ATTENUATION COUPLING NETWORK COMPRISING AN INPUT TERMINAL AND AN OUTPUT TERMINAL, A COMMON REFERENCE TERMINAL, FIRST AND SECOND VOLTAGE VARIABLE CAPACITIVE ELEMENTS SERIALLY CONNECTED WITH OPPOSITE POLARIZATION BETWEEN SAID INPUT AND OUTPUT TERMINALS, A THIRD VOLTAGE VARIABLE CAPACITIVE ELEMENT CONNECTED BETWEEN THE JUNCTION OF SAID FIRST AND SECOND CAPACITIVE ELEMENTS AND A COMMON JUNCTION, A SIGNAL COUPLING CAPACITOR CONNECTED BETWEEN SAID COMMON REFERENCE TERMINAL AND SAID COMMON JUNCTION, A SOURCE OF VARIABLE DIRECT-CURRENT VOLTAGE OPERABLY CONNECTED ACROSS EACH OF SAID FIRST AND SECOND VOLTAGE VARIABLE CAPACITIVE ELEMENTS, SAID VARIABLE DIRECT-CURRENT VOLTAGE BEING OF A PREDETERMINED POLARIZATION TO EFFECT REVERSE BIASING OF SAID FIRST AND SECOND VOLTAGE VARIABLE CAPACITIVE ELEMENTS, MEANS INCLUDING A FIXED REFERENCE DIRECT-CURRENT VOLTAGE SOURCE AND SAID VARIABLE DIRECT-CURRENT VOLTAGE SOURCE OPERABLY CONNECTED ACROSS SAID THIRD VOLTAGE VARIABLE CAPACITIVE ELEMENT FOR EFFECTING A REVERSE BIAS OF SAID THIRD CAPACITIVE ELEMENT AS AN INVERSE FUNCTION OF THE MAGNITUDE OF SAID VARIABLE DIRECT-CURRENT VOLTAGE SOURCE, FOURTH AND FIFTH VOLTAGE VARIABLE CAPACITIVE ELEMENTS WITH FIRST ELECTRODES THEREOF CONNECTED TO SAID COMMON JUNCTION AND BEING LIKE-POLARIZED WITH SAID THIRD VOLTAGE VARIABLE CAPACITIVE ELEMENT WITH RESPECT TO SAID COMMON JUNCTION, SECOND ELECTRODES OF SAID FOURTH AND FIFTH CAPACITIVE ELEMENTS CONNECTED THROUGH SECOND AND THIRD COUPLING CAPACITORS TO SAID INPUT AND OUTPUT TERMINALS RESPECTIVELY, THE JUNCTIONS BETWEEN SAID FOURTH AND FIFTH CAPACITIVE ELEMENTS AND SECOND AND THIRD COUPLING CAPACITORS CONNECTED THROUGH FIRST AND SECOND SIGNAL FREQUENCY BLOCKING ELEMENTS TO THE JUNCTION BETWEEN SAID FIRST AND SECOND VOLTAGE VARIABLE CAPACITIVE ELEMENTS.