Automotive window glass antenna

摘要

A second antenna is provided to a vehicle rear window glass in order to prevent a fall or dip of the gain of the antenna system in a particular direction or directions, thereby improving the directivity characteristic and increasing the gain. The second antenna consists of a feed point and a pair of first and second elements connected to the feed point. The first element has, in an area of the space above a first antenna or in a space defined between the upper and lower ends of a first antenna, at least one horizontal conductive strip. In one embodiment, in which the feed point is arranged in a marginal area of the space under the defogging heater element, the first element further has a vertical conductive strip arranged in an area of the space between the heater element and a lateral edge of the window glass. The second element is arranged in an area of the space under the defogging heater element and made up of a conductive strip assembly of various shapes such as -shape, a rectangular loop or loops, or a T-shape. The second element is connected to a bus bar or a heating strip of the defogging heater element in order to further increase the gain of the antenna system in all directions.