Vehicle window glass antenna coupled with defogging heater

摘要

On a vehicle window glass provided with defogging heater strips, such as automobile rear window glass, the invention provides an antenna of improved efficiency for receiving FM and AM radio broadcast waves. In an area left above the heater strips the antenna is constructed of at least three elements each of which is a conductive strip. The first and main element is a T-shaped element with its horizontal part at a short distance from the upper edge of the window glass. On one side of the vertical part of the T-shaped element, the second element extends horizontally from a point on that vertical part. The third element, which is located on the other side of that vertical part, has a primary part which constitutes at least three sides of a horizontally elongate rectangle and a secondary part which extends horizontally from a point on the vertical part of the T-shaped element and connects with the primary part. A lead extends from a side of the rectangle to a feed point. The antenna is coupled with the heater strips by a conductive line which connects with the heater strips and has a horizontal part that makes capacitive coupling with the horizontal part of the T-shaped element.