Abstract: A switching circuit includes an insulating substrate including two signal transmission lines; a switching diode mounted, in series between the two signal transmission lines, on the insulating substrate, wherein an anode terminal and a cathode terminal are connected to the two signal transmission lines, and the switching diode is turned on or off; and a conductive pattern formed, below the switching diode, on a mounting face of the insulating substrate on which the switching diode is mounted, wherein the conductive pattern is grounded. There are stray capacitances between the anode terminal and the conductive pattern and between the cathode terminal and the conductive pattern.

Abstract: A switching circuit includes an insulating substrate including two signal transmission lines; a switching diode mounted, in series between the two signal transmission lines, on the insulating substrate, wherein an anode terminal and a cathode terminal are connected to the two signal transmission lines, and the switching diode is turned on or off; and a conductive pattern formed, below the switching diode, on a mounting face of the insulating substrate on which the switching diode is mounted, wherein the conductive pattern is grounded. There are stray capacitances between the anode terminal and the conductive pattern and between the cathode terminal and the conductive pattern.

Abstract: A signal switching circuit has first to fourth diode pairs each comprising two series-connected diodes disposed respectively between a first input terminal and a first output terminal, between a second input terminal and the first output terminal, between the first input terminal and the second output terminal, and between the second input terminal and the second output terminal, and first to fourth capacitor circuits connected respectively between diode-to-diode connection points in the diode pairs and the ground. The first or second diode pair is rendered conductive in an alternative manner. Likewise, the third or fourth diode pair is rendered conductive in an alternative manner. A low pass filter for passing therethrough the corresponding first or second signal uses residual inductance in each of the diode pairs thus rendered conductive and the associated capacitor circuit.

Abstract: A signal switching circuit is disclosed wherein first to fourth diode pairs each comprising two series-connected diodes are disposed respectively between a first input terminal and a first output terminal, between a second input terminal and the first output terminal, between the first input terminal and the second output terminal, and between the second input terminal and the second output terminal, and first to fourth capacitor means connected respectively between diode-to-diode connection points in the diode pairs and the ground are provided. The first diode pair or the second diode pair is rendered conductive in an alternative manner. Likewise, the third diode pair or the fourth diode pair is rendered conductive in an alternative manner. By residual inductance in each of the diode pairs thus rendered conductive and the associated capacitor means there is constructed a low pass filter for passing therethrough the corresponding first or second signal.