| 摘要 |
<p>A concealed antenna system for a vehicle radio communication system consists of a slot or notch cut in a conductive panel which is adapted to form part of or be fitted to the structure of a vehicle with which the radio communication system is to be used. In order to produce vertically polarised radiation the antenna is positioned with the slot or notch horizontal and in order to ensure that the antenna operates with a non-resonant feed line matched to the antenna impedance a coaxial cable is connected to the edges of the slot by insulated leads linked to the magnetic field in a portion of the slot. Alternatively a non-magnetic electrically conductive element is positioned spanning a part of the slot and insulated therefrom.</p> |
