Vehicular power line communication system and transmitter

A vehicular power line communication system comprising:

• a transmitter including a loop coil as a power line and a communication line, the transmitter superimposing a high-frequency signal on the loop coil to transmit electric power and a signal;
• a receiver including (i) an aperture antenna being loop-shaped and (ii) a circuit, the loop coil forming electromagnetic induction connection with an electromagnetic field generated in the loop coil according to electric currents flowing in the loop coil to receive high-frequency electric power of the loop coil, the circuit operating by using the electric power transmitted from the transmitter;
• and
• a matching circuit including a capacitor that is connected in series or parallel to the loop coil and/or the aperture antenna,
• wherein the loop coil of the transmitter includes an aperture-opposite opening area that is an opening area opposite to an opening area of the aperture antenna, the aperture-opposite opening area being formed to be larger than a different opening area of the loop coil other than the aperture-opposite opening area.