| 摘要 |
<p>The conductive baseplate carries a conventional signal processing circuit board with antennas for various GHz frequencies, under a dielectric cover (6, 7). The cover surface has radiative conductive structures (8, 9, 10, 11, 12, 13) for different frequencies, with matching networks. For lower frequency signals of a meter wavelength and above, conductive structures of a radiator (10) are formed on a lower section (10.1) of the cover surface, and an upper section (10.2) attached to the cover, projects away from its outer contours. The hood (a form of radome) is aerodynamic, provides form and carries the circuitry on its inner surfaces. It is an intermediate cover (6) under an outer cover (7). The structures form both driven- and parasitic antenna elements. Numbers of radiators are provided for a common frequency in an optionally diversity-switched arrangement. The low frequency radiator (10, 10.1, 10.2) is electrically-continuous and is designed for multiband capabilities. The cover is a partially-metallized molding. Alternatively, a suitably-structured foil is bonded to the internal surface of the cover. The antenna unit is positioned on generally-horizontal surfaces of the vehicle, e.g. on the roof or trunk flap. Various means of connection between and to the antenna circuitry and its components are detailed.</p> |
