Patent ID: 7227503

Claim:
An antenna device for a motor vehicle comprising: a defogger provided on a rear window glass panel of the motor vehicle; an AM antenna provided in a space other than the defogger on the rear window glass panel; an FM antenna provided in a space between the defogger and the AM antenna on the rear window glass panel; a two-input amplifier for amplifying signals received by the AM and FM antennas; an AM lead wire for connecting between a feeding terminal of the AM antenna and the amplifier; an FM lead wire for connecting between a feeding terminal of the FM antenna and the amplifier, a capacitive coupling being formed between the AM and FM lead wires; and an inductor inserted in the AM lead wire near to the AM feeding terminal; wherein the inductor opens the AM lead wire in a high frequency to cut off a signal from the AM antenna when a signal received by the FM antenna is amplified by the amplifier.