Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1977-08-01
1979-03-20
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural separate diverse type
343802, 343809, 343819, 343876, H01Q 2100, H01Q 944
Patent
active
041456947
ABSTRACT:
A compact, all channel television antenna system is provided for improved reception within buildings where multiple reflections or ghosting and weak signals are typical operating conditions. The high performance in this environment with a very small antenna is achieved by the antenna's directive gain and pattern nulls, good impedance matching, low acceptance of vertical polarization, band switching, and repeatable orientation of the antenna. The antenna is characterized by a miniature, symmetrically top-loaded dipole and efficient matching circuit at the lower VHF television band. The top-loading elements are reused as parasitic elements in a compact, directive array at the upper VHF channels. Similarly, in the UHF television bands bending and top loading is used to reduce the size of radiators and to provide loading for the VHF bands. A construction of UHF half loops in parallel is used with a system of reflecting and directing elements.
REFERENCES:
patent: 2507225 (1950-05-01), Scheldorf
patent: 2532138 (1950-11-01), Atchison
patent: 2640933 (1953-06-01), Spindler
patent: 2642528 (1953-06-01), Albright
patent: 4038662 (1977-07-01), Turner
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