Low noise converter of satellite broadcasting receiver

A low noise converter comprising:

• first and second amplification circuits receiving first and second polarized wave signals transmitted from a satellite and amplifying said first and second polarized wave signals, respectively;
• a plurality of switch circuits, each selecting one of the outputs from said first and second amplification circuits;
• a plurality of filter circuits provided corresponding to said plurality of switch circuits, respectively, for removing an image signal;
• a plurality of signal mixer-amplifiers provided corresponding to said plurality of filter circuits, respectively, and each configured to frequency-convert an output from a corresponding filter circuit by mixing with a local oscillation signal and to amplify the frequency-converted signal;
• and
• a plurality of output ports provided corresponding to said plurality of signal mixer-amplifiers, respectively, for receiving an output from said plurality of signal mixer-amplifiers,
• wherein each of said plurality of switch circuits includes:
• a first bipolar transistor receiving said first polarized wave signal at a base, and ground potential at an emitter;
• and
• a second bipolar transistor receiving said second polarized wave signal at a base, and ground potential at an emitter.