The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2004
Filed:
Jun. 19, 2000
Kentaro Nishimori, Kanagawa, JP;
Keizo Cho, Kanagawa, JP;
Yasushi Takatori, Kanagawa, JP;
Toshikazu Hori, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
In an array antenna used in a transceiver in a time division communication system such as TDD (Time Division Duplex) system, amplitude and phase of each antenna element are calibrated in a transceiver itself during actual communication without using external information. A first transmitter ( - - ) has means ( - - ) to send a transmit signal to an antenna element ( - - ) as well as to at least one of the receivers ( - - through - -N). Other transmitter ( - - through - -k) except the first transmitter has means ( - -k) which sends a transmit signal to a related antenna element ( - - through - -k) as well as to a first receiver ( - - ) which relates to the first transmitter. Amplitude/phase value obtained in the first receiver ( - - ) and amplitude/phase values obtained in other receivers ( - - through - -k) except the first receiver provide weighted amplitude/phase values of each antenna elements according to desired desired radiation pattern.