Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Reexamination Certificate
2000-03-03
2001-04-17
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
C342S382000
Reexamination Certificate
active
06218988
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a transmitter having an array antenna which is composed of a plurality of antenna elements.
A transmitter is known which has an array antenna composed of a plurality of antenna elements. Such a transmitter will be called an array antenna transmitter which may be used in a cellular mobile communication system. The array antenna transmitter forms a directional pattern by which a maximum transmission gain is obtained in concern to a direction of arrival of a desired or a reception signal, in order to prevent the array antenna transmitter from interference on transmission.
In a conventional array antenna transmitter, the antenna elements are arranged circularly to form the directional pattern of transmission gain that is almost uniform in every direction. As a result, it is difficult to obtain a high transmission gain proportional to the number of antenna elements, as will be described later.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide an array antenna transmitter capable of obtaining a high transmission gain proportional to the number of antenna elements.
Other objects of this invention will become clear as the description proceeds.
According to this invention, there is provided an array antenna transmitter comprising (A) an array antenna comprising a polygon having sides of M, sectors of M established on the sides, respectively, antenna elements of N arrayed linearly on each of the M sectors, where M is a positive integer which is not less than three, and N is a positive integer which is not less than one, (B) transmission antenna weight-producing means for producing transmission antenna weights for each of the sectors of M in accordance with an input information on an estimated direction of arrival of received signal, and (C) adaptive transmission means of M supplied with transmission signals for respective users and corresponding ones of the transmission antenna weights for supplying antenna transmission signals of N to a corresponding one of the antenna elements, the antenna transmission signals of N being used to transmit desired wave signals having directional patterns with gains in the directions of the users.
REFERENCES:
patent: 3706998 (1972-12-01), Hatcher et al.
patent: 4551727 (1985-11-01), Cunningham
patent: 4575724 (1972-12-01), Wiener
NEC Corporation
Phan Dao L.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tarcza Thomas H.
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