Patent ID: 6538610
Filing Date: 2003-03-25
Classification: H01Q

Abstract:
A signal transmission circuit for transmitting a signal received in an antenna unit to a receiver body through a glass plate, said antenna unit having an output terminal, said receiver body having an input terminal, said glass plate having first and second surfaces which are opposite to each other, said signal transmission circuit comprising:a first coaxial cable having an end connected to the output terminal of said antenna unit; a second coaxial cable having an end connected to the input terminal of said receiver body; a first electrode pair consisting of a pair of electrodes adhered to the first surface of said glass plate; a second electrode pair consisting of a pair of electrodes adhered to the second surface of said glass plate at a position opposed to said first electrode pair; a first balanced line having an end pair connected to said first electrode pair; a second balanced line having an end pair connected to said second electrode pair; a first balun, disposed between another end of said first coaxial cable and another end pair of said first balanced line, for impedance converting from said first coaxial cable to said first balanced line; and a second balun, disposed between another end pair of said second balanced line and another end of said second coaxial cable, for impedance converting from said second balanced line to said second coaxial cable.