Efficient, dual-polarization, three-dimensionally omni-directional crossed-loop antenna with a planar base element
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United States of America Patent
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Jan 7, 1997
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N/A
app pub date -
Jul 10, 1995
filing date -
Jul 10, 1995
priority date (Note) -
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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.
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