Efficient, dual-polarization, three-dimensionally omni-direction

Details Efficient, dual-polarization, three-dimensionally omni-direction Efficient, dual-polarization, three-dimensionally omni-direction

1995-07-10

1997-01-07

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

High frequency type loops

343797, 343855, 343860, 343867, H01Q 1112

Patent

active

055921825

ABSTRACT:
A self-contained system containing an antenna, a circuit board, and a power source. The antenna consists of two loop elements mounted perpendicular to each other on a circular metal plate that acts both as part of the radiating system and as a shield between the circuitry and the radiator. The circuit board includes a transmitter, a receiver, and other circuitry for storing information and executing software. The antenna has a high gain, is omnidirectional in two orthogonal polarizations, and has a high degree of isolation between the two loop elements. To achieve omnidirectionality, in one mode, the antenna operates by using each loop element in a time-sequence of brief on/off states. In another mode, the transceiver uses both loop elements simultaneously with the signals on the two loop elements in phase quadrature.

REFERENCES:
patent: 3440542 (1969-04-01), Gautney
patent: 3560983 (1971-02-01), Willie et al.
patent: 3680135 (1972-07-01), Boyer
patent: 3683389 (1972-08-01), Hollis
patent: 3721989 (1973-03-01), Christensen
patent: 3945013 (1976-03-01), Brunner et al.
patent: 4479127 (1984-10-01), Barbano
patent: 4814777 (1989-03-01), Caci et al.
patent: 5173715 (1992-12-01), Rodal et al.
patent: 5521610 (1996-05-01), Rodal

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