Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-03-16
1983-08-09
Lieberman, Eli
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
H01Q 2112
Patent
active
043982018
ABSTRACT:
The improved director (10) of the present invention provides an apparatus and method for increasing the directive gain of an antenna (30), and more particular, for a director in the high VHF band region while reinforcing the low VHF band. The director (10) includes a first element (220) having two symmetrical half sections (222, 224) with inboard ends (240) of each of the half sections mounted to and insulated from the boom (20), a second element (210) having two symmetrical half sections (212, 214) with inboard ends (240) of each half section mounted to an insulated from the boom (20), a pair of opposing phasing lines (230) parallel to the longitudinal length of the boom (20) and separated from each other by a first predetermined distance (410) wherein each phasing line (230) is electrically interconnected with the inboard ends (240) of the first and second element half sections (212 and 222, 214 and 224) located on the same side as the boom (20). Each half section of the first element (220) is substantially one half-wavelength electrically long in the high VHF band and the second element (210) and substantially one half-wavelength electrically long in the high VHF band. The two elements (210 and 220) are substantially spaced at a guarter wavelength in the high VHF band. The capacitance existing between the phasing lines (230) provides sufficient tuning so that the resonating currents in the first half section (222) of the first element (220) and the second half section (224) of the first element (220) are substantially in phase and additive.
REFERENCES:
patent: 2700105 (1955-01-01), Winegard
patent: 2975423 (1961-03-01), Wells
patent: 3599217 (1971-08-01), Grant
Winegard Television Products, Catalog 179.
Shelledy Carey W.
Winegard John R.
Dorr Robert C.
Lieberman Eli
Winegard Company
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