Antenna for radio reception with diversity function in a vehicle

Abstract

Antenna for radio reception, which is disposed, for reception of frequencies above the high-frequency range, in a motor vehicle window, in an electrically conductive vehicle body, together with an imprinted heating field, which field extends into the vicinity of the upper window edge, and comprises horizontally disposed heating conductors and bus bars situated at the side edges of the heating field, for supplying the direct current for heating by way of high-frequency-insulating uncoupling networks, whereby at least one antenna is formed by means of connecting this heating field to an antenna connection contact, by way of a conductor. A rod antenna with an antenna connection contact in the antenna foot point, with electrical through-coupling of the reception signals into the vehicle interior, is present on the outer skin of the vehicle and affixed in the vicinity of the upper window edge, for the reception of signals both for low frequencies and above the high-frequency range. The antenna connection contact of the rod antenna and the at least one antenna connection contact on the motor vehicle window pane, as well as the ground connection to the metallic vehicle body, are combined in the spatial region of an antenna connection point of at least two diversity antennas, for frequencies above the high-frequency range, and the geometrical expanse of this antenna connection point is smaller than 1/15 of the wavelength in this frequency range. An antenna module is present within the region of the antenna connection point, in which all the electronic components required for signal amplification in both frequency ranges are contained, and to which module the reception signals of the antenna connection contacts are passed by way of connection lines, and to the ground connection, and whose output signals in both frequency ranges are passed to a receiver, by way of a shielded HF line.