Glass antenna mounted into the window cutout of a metallic motorcar body

摘要

A window-pane antenna which is to be inserted into the window opening of metallic motor-vehicle bodywork and is set up for mobile radio in dual-band operation using wavelengths (L and K; L = 2 K) which differ approximately by a factor 2. It is equipped with unipoles which are tuned to the wavelength. An L/4 unipole and a K/4 unipole are connected electrically in parallel and are arranged in a U-shape or V-shape with an electronically conductive connection at the base. An L-radial is allocated to the L/4 unipole and a k-radial is allocated to the K/4 unipole, which radials run parallel to the metallic edge of the window opening. The core of a coaxial cable is connected to the base, via a connecting piece. The screen of the coaxial cable is connected to the two radials. The distance of the two radials from the metallic edge of the window opening and their lengths l, k and widths are selected such that the screen of the coaxial cable is sufficiently free of waves in the sheath and the radiation characteristic is optimised.