Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Reexamination Certificate
2005-11-22
2008-09-23
Phan, Dao L (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
C342S373000, C342S374000, C342S443000
Reexamination Certificate
active
07427953
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.
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Chiang et al., “A Foam Dielectric Matrix-Fed Electronically Despum Circular Array”, Antennas And Propagation Society International Symposium, 1970, vol. 8, pp. 29-36, (Sep. 1970).
Chiang Bing A.
Goldberg Steven Jeffrey
Lynch Michael James
InterDigital Technology Corporation
Phan Dao L
Volpe and Koenig P.C.
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