Communications: radio wave antennas – Antennas – Active antenna as reflector
Patent
1985-08-23
1987-06-02
Lieberman, Eli
Communications: radio wave antennas
Antennas
Active antenna as reflector
343846, 343874, H01Q 148, H01Q 936
Patent
active
046707603
ABSTRACT:
A radiating antenna system (30) comprises a plurality of vertically erect secondary antennae (34) disposed in a pattern about a vertically erect primary antenna (32). An electrically conductive screen (36) which surrounds the pattern of secondary antennae (34) includes partially-buried, partially exposed electrical conductors (54) which have exposed ends (54b) thereof electrically connected to one or more above-ground, loop-forming cables (52). A series of open-ended transmission lines 70 are suspended in an essentially horizontal plane above the ground with each of the transmission lines (70) being electrically connected to a top of an associated secondary antenna (34). The secondary antennae (34) are excited in a manner whereby radiation therefrom essentially cancels sky waves radiated by the primary antenna (32). The screen (36) has an electromagnetic image induced thereon and serves to curtail at least the propagation of surface waves radiated by the secondary antennae (34) without significantly curtailing the propagation of surface waves radiated by the primary antenna (32).
REFERENCES:
patent: 1683739 (1928-09-01), Stone
patent: 2064204 (1936-12-01), Gothe et al.
patent: 2283617 (1942-05-01), Wilmotte
patent: 2283618 (1942-05-01), Wilmotte
patent: 2516706 (1950-07-01), Laport
patent: 2609504 (1952-09-01), Wilmotte
patent: 2770802 (1956-11-01), Mullaney
patent: 3742511 (1973-06-01), Smith et al.
R. C. Fenwick, "A New Class of Electrically Small Antennas", IEE Transactions on Antennas and Propagation, May 1965, pp. 379-383.
Radio Engineers' Handbook, pp. 816-818.
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