Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Patent
1996-11-01
1999-10-12
Vo, Nguyen
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
455129, 455269, 455562, 343867, H04B 502
Patent
active
059666412
ABSTRACT:
A communication link includes a base unit and a remote unit that each include a transmit aerial and a receive aerial. These units communicate via magnetic inductive fields. The transmit aerial may be an array that shapes the field to transmit in front of the base unit to minimize interference between adjacent base units. Transmission from the base unit to the remote unit preferably uses magnetic inductive fields that are orthogonal to the magnetic inductive fields that transmit from the remote unit to the base unit. Accordingly, the aerials include aerials for receiving and transmitting in such orientations. A tri-axial array includes three aerials that are orthogonal to each other to allow the aerials to be driven by currents that are phase shifted and amplitude modulated so that the plane of the field is selectively tilted to maximize coupling between the base unit and remote unit. Such tilting allows the user of the remote unit to move relative to the base unit and maintain maximum coupling.
REFERENCES:
International Search Report for International Application No.: PCT/US97/19675.
Plantronics Inc.
Vo Nguyen
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