Patent ID: 7420517

Claim:
A high frequency wave glass antenna for an automobile, comprising a plurality of heating wires and a plurality of bus bars for feeding the heating wires, disposed in or on an automobile rear widow glass sheet, the heating wires and the bus bars forming a defogger, the heating wires extending in a horizontal direction, a substantially horizontal direction, a direction along an upper edge of the rear window glass sheet or a direction along a lower edge of the rear window glass sheet; and an antenna conductor disposed in an upper margin of the rear widow glass sheet except for a defogger region; further comprising: at least one of the heating wires having a detour formed at one or more locations therein; a heating wire with the detour, having an inlet connected to the detour; and both ends of the inlet connected to both ends of the detour directly or through a pair of connection lines; wherein in a case where both ends of the inlet are connected to both ends of the detour through the paired connection lines, a shorter one of the shortest spacing between the paired connection lines and the shortest spacing between both ends of the inlet is called W e ; and in a case where both ends of the inlet are connected to both ends of the detour directly, the shortest spacing between both ends of the inlet is called W e ; when a maximum width of the detour in a horizontal direction is call W r , a received frequency has λ 0 in the air, and the formula of {(W r −W e )/2}=L 1 is established, the formula of L 1 ≧0.0053·λ 0 is satisfied.