Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2005-01-04
2005-01-04
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S742000, C343S867000, C455S277100
Reexamination Certificate
active
06839031
ABSTRACT:
A wireless telephone antenna system including at least one loop antenna (12) providing a directional antenna field pattern with superior gain performance in comparison to an omnidirectional antenna. The antenna system effectively rotates the loop antenna and selects the best gain in a direction of interest. The antenna system preferably also includes a conventional omnidirectional antenna (18), to which radio-frequency (RF) power is reduced when a better antenna gain is provided by the loop antenna, thereby reducing overall power consumption of the telephone. The loop antenna field pattern (14) is preferably selected to minimize RF radiation in the direction of the user's head (40).
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patent: 3940767 (1976-02-01), DeLano et al.
patent: 4280128 (1981-07-01), Masak
patent: 4342999 (1982-08-01), Woodward et al.
patent: 4540988 (1985-09-01), Munk et al.
patent: 5898908 (1999-04-01), Griffin et al.
patent: 6111542 (2000-08-01), Day et al.
patent: 20020083458 (2002-06-01), Henderson et al.
Ho Tan
Northrop Grumman Corporation
Tarolli, Sundheim Covell & Tummino L.L.P.
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