Automobile windshield antenna incorporating windshield heater

Claim 1

An automobile windshield antenna for receiving a first reception frequency band and a second reception frequency band, said antenna comprising: a defogging heater wire which resonates in said first reception frequency band but not in said second reception frequency band, a terminal of said heater wire being grounded in terms of high-frequency by a capacitor or insulated in terms of high-frequency from a power supply circuit by a choke coil for said first reception frequency band, and a conductor which is installed in said window glass and has an output terminal, said conductor being resonant in said first reception frequency band but not in said second reception frequency band, wherein said heater wire and conductor are installed in such a positional relationship that said heater wire and conductor are inductively and capacitively coupled together in said first reception frequency band, thus forming a state of double resonance, said heater wire and conductor are respectively capable of reception in said first reception frequency band, and said heater wire and conductor are electrically not coupled in said second reception frequency band so that reception of said second reception frequency band is accomplished only by said conductor.