A HIGH-FREQUENCY-SIGNAL SWITCHING CIRCUIT (1) INCLUDES A FIRST HIGH-FREQUENCY-SIGNAL PATH (2) WHICH INCLUDES FIRST AND SECOND DIODES (22, 23) CONNECTED IN SERIES WITH A HIGH-FREQUENCY AMPLIFIER STAGE THEREBETWEEN, AND A SECOND HIGH-FREQUENCY-SIGNAL PATH (3) FORMED OF A THIRD DIODE (31) CONNECTED IN PARALLEL TO THE FIRST HIGH-FREQUENCY-SIGNAL PATH (2). A SWITCHING-VOLTAGE SUPPLY SECTION SWITCHES THE HIGH-FREQUENCY AMPLIFIER STAGE AND FIRST AND SECOND DIODES (22, 23) ON, AND THE THIRD DIODE (31) OFF, SO THAT A HIGH-FREQUENCY SIGNAL IS TRANSFERRED THROUGH THE FIRST HIGH-FREQUENCYSIGNAL PATH (2), OR SWITCHES THE HIGH-FREQUENCY AMPLIFIER STAGE AND FIRST AND SECOND DIODES (22, 23) OFF AND THE THIRD DIODE (31) ON, SO THAT A HIGH-FREQUENCY SIGNAL IS TRANSFERRED THROUGH THE SECOND HIGH-FREQUENCY-SIGNAL PATH (3).(FIG 1)
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