Wireless communication method and antenna system for...

Details Wireless communication method and antenna system for... Wireless communication method and antenna system for...

2006-01-31

2006-01-31

Phan, Dao (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

C342S373000, C342S443000

Reexamination Certificate

active

06992622

ABSTRACT:
A wireless communication method and antenna system for determining the direction of arrival (DOA) of received signals in azimuth and elevation, (i.e., in three dimensions), to form a beam for transmitting and receiving signals. The system includes two antenna arrays, each having a plurality of antenna elements, two first stage multi-mode-port matrices, at least one second stage multi-mode-port matrix, an azimuth phase detector, an elevation amplitude detector, a plurality of phase shifters and a transceiver. The antenna arrays and the first stage multi-mode-port matrices form a plurality of orthogonal omni-directional modes. Each of the modes has a characteristic phase set. Two of the modes' phases are used to determine DOA in azimuth. The second stage multi-mode-port matrix forms a sum-mode and a difference-mode used to determine the DOA of the received signals in elevation. A beam is formed in the direction of the received signals by adjusting the phase shifters.

REFERENCES:
patent: 4989011 (1991-01-01), Rosen et al.
patent: 5771017 (1998-06-01), Dean et al.
patent: 6304214 (2001-10-01), Aiken et al.
patent: 6650910 (2003-11-01), Mazur et al.
patent: 6791507 (2004-09-01), Johansson et al.
http://scholar.lib.vt.edu/theses/available/etd-04262000-15330030/unrestricted/ch4.pdf, Chapter 4, Smart Antenna Technology, pps. 26-40.

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