Radiation noise suppression circuit for differential transmission line

A radiation noise suppression circuit for a differential transmission line, comprising:

• a differential transmission line which has plus line signal wiring to which a plus line signal of a differential signal is applied, and minus line signal wiring to which a minus line signal of said differential signal is applied, and connects a differential driver and a differential receiver;
• signal GND wiring one end of which is connected to said differential driver, and is wired outside of said differential transmission line along said differential transmission line;
• a coil unit in which each of said plus line signal wiring, said minus line signal wiring, and said signal GND wiring is wound in the same winding direction;
• a first impedance element and a second impedance element which have substantially the same impedance value, and which are connected in series between said plus line signal wiring and said minus line signal wiring at a location nearer to said differential receiver than said coil unit;
• and
• a third impedance element one end of which is connected to a junction point, where said first impedance element and said second impedance element are connected mutually, at a location nearer to said differential receiver than said coil unit, and another end of which is connected to another end of said signal GND wiring.