Vehicle mounted antenna device

A vehicle mounted antenna device installed on a vehicle, comprising:

• a circuit board on which an amplifier circuit is placed;
• a substantially planar shaped main element portion that is disposed on substantially the same plane as the circuit board, functions also as a capacitive antenna designed for a first frequency band, and includes a bent pattern having an antenna capacity substantially equivalent to a solid pattern;
• and
• an auxiliary element portion that includes a body ground cable that is connected in series between the amplifier circuit and a vehicle body so as to complement shortage of an antenna length of the main element portion so that the antenna length of the main element portion is designed for a second frequency band, the body ground cable having an antenna capacity smaller than that of the main element portion.

A vehicle mounted antenna device installed on a vehicle, comprising:

• an amplifier circuit installed on the vehicle;
• a substantially planar shaped main element portion that functions also as a capacitive antenna designed for a first frequency band and includes a bent pattern having an antenna capacity substantially equivalent to a solid pattern;
• and
• an auxiliary element portion that includes a low voltage cable that is connected in series between the main element portion and the amplifier circuit so as to complement shortage of an antenna length of the main element portion so that the antenna length of the main element portion is designed for a second frequency band, the low voltage cable having an antenna capacity smaller than that of the main element portion.