Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-08-18
1982-02-23
Lieberman, Eli
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343885, 343890, H01Q 2126
Patent
active
043171222
ABSTRACT:
A circularly polarized broadcast antenna includes a vertical mast and a plurality of bays spaced along the mast. Each bay includes at least one crossed dipole fed in quadrature mounted adjacent the mast. Each bay also includes a sleeve which may be .lambda./2 long disposed about the mast to act as a choke to prevent induced current flow on the mast. Current flow in the sleeve creates a vertically-polarized field component which perturbs the directly radiated field and increases the axial ratio. A polarizer is mounted orthogonal to the mast, and the currents induced in the polarizer are orthogonal to and in phase quadrature with the reradiated field of the sleeve to improve the axial ratio.
REFERENCES:
patent: 2512137 (1950-06-01), Buchwalter et al.
patent: 3428923 (1969-02-01), Webb
patent: 3518692 (1970-06-01), Kuecken
patent: 3702479 (1972-11-01), Uhrig
patent: 3725943 (1973-04-01), Spanos
patent: 3896450 (1975-07-01), Fitzroy et al.
patent: 4011567 (1977-03-01), Ben-Dov
patent: 4083051 (1978-04-01), Woodward
patent: 4109255 (1978-08-01), Silliman
RCA Data Sheet, AVAG-1 VHF Circularly Polarized Antenna, Apr. 1948.
Jampro Antenna Co. Catalog, Apr. 1, 1973.
Lieberman Eli
Meise William H.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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