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:
Dec. 23, 1997
Filed:
Apr. 25, 1995
Hidehiko Norimatsu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A radio apparatus according to the present invention comprises a plurality of antennas to be selectively connected to a radio circuit, switches capable of grounding a maximum point in the current distribution of a standing wave of each antenna, and a circuit for operating a switch of a non-selected antenna of these antennas to be grounded. The present invention also includes an antenna switching circuit for synchronizing each switch to selectively perform switching operation. In such an arrangement, one of a plurality of antennas is selected to be connected to the radio circuit, and an intermediate terminal of the selected antenna is opened to obtain a predetermined current distribution of a standing wave, thereby assuring the normal communication operation. Meanwhile, a point having a maximum value of the current distribution of a standing wave of one or more non-selected antennas is grounded to collapse the impedance thereof, and these antennas are prevented from interfering with the selected antenna, avoiding the affection of these antennas to the selected antenna.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile