Communications: radio wave antennas – Antennas – Mast or tower type
Patent
1978-09-07
1980-01-15
Gensler, Paul L.
Communications: radio wave antennas
Antennas
Mast or tower type
343861, 343890, H01Q 934, H01Q 112, H01Q 150
Patent
active
041841654
ABSTRACT:
In accordance with the present invention, a single shunt feed mechanism, including a single gamma section and a single impedance matching circuit, is employed to enable an antenna tower as an effective radiator in plural wave length bands without having to alter the upper tie point of the gamma section to the antenna tower. In one embodiment, the shunt feed of the invention enables the antenna tower as an effective radiator in either two of the adjacent bands mentioned, namely the 40 and 80 meter bands or the 80 and 160 meter bands. In accordance with another embodiment of the invention, a single shunt feed mechanism, including a single gamma section, a single impedance matching circuit, and a filter, enables an antenna tower as an effective radiator in all three of the indicated bands.
REFERENCES:
patent: 2063303 (1936-12-01), Evans
patent: 2118429 (1938-05-01), Duttera
patent: 2153768 (1939-04-01), Morrison
patent: 2171256 (1939-08-01), Moullin
patent: 2283619 (1942-05-01), Wilmotte
patent: 2441086 (1948-05-01), Stinson
patent: 2702345 (1955-02-01), Walter
patent: 4001832 (1977-01-01), Chesneau et al.
patent: 4131895 (1978-12-01), Robinson
patent: 4145693 (1979-03-01), Fenwick
Beaumont, J. T., "Semi-Vertical Trap Aerial...," in Radio Communication, Aug. 1976, pp. 592-593.
Cunningham, E. W., "Shunt Feeding Towers for Operation on the Lower Amateur Frequencies," in QST, Oct. 1975, pp. 22-26.
Barlow Harry E.
Gensler Paul L.
Lacher Frederick K.
Sklar Warren A.
Stuart Electronics
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