Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Patent
1998-06-19
2000-05-02
Le, Hoanganh
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
343892, 455561, 455562, H01Q 112
Patent
active
060578068
ABSTRACT:
Omnidirectional cellular coverage may be provided by installing four 90 degree antennas on the sides of a tower. However, in a prior system pattern uniformity will be destroyed by nulling effects if the tower width causes the lateral separation between adjacent antennas to be large. Nulling effects in areas of overlap between beams of adjacent antennas are avoided by providing an omnidirectional pattern characterized by signal polarization which changes with azimuth. Cross polarization of adjacent antennas is achieved by providing North and South antennas with +45 degrees linear polarization and East and West antennas with -45 degrees linear polarization (alternating antennas with right and left circular polarizations may also be used). Portable cellular receivers for use with the antenna system may typically utilize antennas with either vertical or horizontal linear polarization. Polarization mismatches between transmitting and receiving antennas are partially offset by scattering effects in the vicinity of the cellular receiver.
REFERENCES:
patent: 5497166 (1996-03-01), Mahnad
patent: 5581260 (1996-12-01), Newman
patent: 5872548 (1999-02-01), Lopez
patent: 5887267 (1999-03-01), Fugaro
Chen Shih-Chao
Le Hoang-anh
Marconi Aerospace Systems Inc.
Onders Edward A.
Robinson Kenneth P.
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