Communications: radio wave antennas – Antennas – With vehicle
Patent
1991-01-28
1993-08-03
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With vehicle
343713, 343749, 343847, 343896, 343834, H01Q 132, H01Q 136, H01Q 148
Patent
active
052333620
ABSTRACT:
An antenna (20) has a set of elongated electrically conductive radiating elements (24) disposed about a central mast (26) in the form of a maypole. The radiating elements are electrically connected to each other at a top end of the mast by a top ring (28) and near a bottom end of the mast by a bottom ring (30), both of the rings being electrically insulated from the mast. A positioning unit (32) is located on the mast between the two rings for bowing the radiating elements away from the mast. Sections of the respective radiating elements located between the positioning unit and the bottom ring are severed and connected together by impedance elements (82). Each of the impedance elements includes a resistor (84) which serves as a load for providing a current distribution in a radiating element similar to that of a traveling wave, the impedance elements also having an inductor (86) and a capacitor (88) connected in parallel with the resistor. The inductor tunes out capacitive reactance of the antenna impedance at a low end and the capacitor shunts out the inductor and the resistor at a high end of an operating frequency band of the antenna. The lower end of the mast may be mounted in a vehicle (22) which serves as an electrically conductive support of the antenna. Signals are fed to the antenna between the bottom ring and ground.
REFERENCES:
patent: 2898590 (1959-08-01), Pichitino
patent: 3001194 (1961-09-01), Leppert
patent: 3229297 (1966-01-01), Bell et al.
patent: 3384896 (1968-05-01), Kriz
patent: 4125840 (1978-11-01), Cassel
Keppler Donald G.
Villaseca Eduardo H.
Denson-Low Wanda K.
Hughes Aircraft Company
Wimer Michael C.
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