Automobile antenna
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 10, 1995
Grant Date -
N/A
app pub date -
Jan 6, 1993
filing date -
Jul 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna is mounted on a window of a vehicle and includes an antenna rod (6) fastened to an electrically conductive base (1) mounted on the outside of the window, and a connection member on the inside of the window directly opposite the base. An antenna lead from the vehicle's radio is connected to the connection member, which comprises a box (8) with an earth plane and is mounted on the window with a conductive plate (12). A connection conductor (13) between the plate (12) and the antenna lead (15) has an electrical length of (1/4+n.times.1/2) times the wavelength of operation, where n=0 or a whole number. The surface exposed by the conductor (13) is spaced from the earth plane (16) so as to define a characteristic impedance for the conductor (13), so that the impedance at the antenna feed point together with the capacitive coupling through the window is transformed into an impedance equal to that of the antenna lead.
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