Repeater isolation through antenna polarization diversity

Communications: radio wave antennas – Antennas – Spiral or helical type

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Details

455 331, 379 59, H01Q 136

Patent

active

060493151

ABSTRACT:
A repeater for extending the range of communications between a base station and a mobile unit without rendering the mobile unit incapable of communicating directly with the base station. In general, the polarization of the repeater input-antenna is different from the polarization of the repeater output-antenna such that sufficient isolation exists between the input and output antennas without substantially reducing the ability of the input antenna and the output antenna to receive signals from and output signals to the base station and the mobile units. In a preferred embodiment, the repeater input antenna is circularly polarized in one direction while the repeater output antenna is circularly polarized in a direction opposite from the input antenna.

REFERENCES:
patent: 2047531 (1936-07-01), Ardenne
patent: 3246331 (1966-04-01), Royal
patent: 4509055 (1985-04-01), Fassett
patent: 4747160 (1988-05-01), Bossard
patent: 5181043 (1993-01-01), Cooper
patent: 5581268 (1996-12-01), Hirshfield

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