WO1999038273A3 - Vector measuring aerial arrays for magnetic induction communication systems - Google Patents

Vector measuring aerial arrays for magnetic induction communication systems Download PDF

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Publication number
WO1999038273A3
WO1999038273A3 PCT/US1999/001342 US9901342W WO9938273A3 WO 1999038273 A3 WO1999038273 A3 WO 1999038273A3 US 9901342 W US9901342 W US 9901342W WO 9938273 A3 WO9938273 A3 WO 9938273A3
Authority
WO
WIPO (PCT)
Prior art keywords
base unit
magnetic induction
orientation
field
induction field
Prior art date
Application number
PCT/US1999/001342
Other languages
French (fr)
Other versions
WO1999038273A2 (en
Inventor
Peter M Flowerdew
David Huddart
Original Assignee
Plantronics
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plantronics filed Critical Plantronics
Priority to AU22406/99A priority Critical patent/AU2240699A/en
Publication of WO1999038273A2 publication Critical patent/WO1999038273A2/en
Publication of WO1999038273A3 publication Critical patent/WO1999038273A3/en

Links

Classifications

    • H04B5/263—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H04B5/22—
    • H04B5/48—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity
    • H04B5/26—
    • H04B5/266—
    • H04B5/77—

Abstract

A wireless communication system automatically aligns a magnetic induction field to establish a two-way communication link between a stationary base unit located, for example, at a user's work station, and a remote unit worn by the user, for example, as a headset or body pack. At any point in time, the base unit and the remote unit have an arbitrary relative orientation to each other. The base unit senses this orientation, then aligns the magnetic induction field to maintain the communication link with the remote unit. In one embodiment, the base unit preferably includes an aerial array having a number of mutually orthogonal windings. Each winding produces a signal when a magnetic induction field generated by the remote unit passes through the base unit. A selector module selects the longitudinal axis of the winding with the strongest signal as an approximation of a direction vector defining the orientation of the magnetic induction field relative to the base unit. In another embodiment, the base unit preferably includes an aerial array comprising three orthogonal windings disposed about a spherical core. A selector module selects one or more windings for transmitting a magnetic field that rotates in a plane orthogonal, i.e., 'crossed field', to the direction vector defining the orientation of the received field relative to the base unit.
PCT/US1999/001342 1998-01-22 1999-01-21 Vector measuring aerial arrays for magnetic induction communication systems WO1999038273A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU22406/99A AU2240699A (en) 1998-01-22 1999-01-21 Vector measuring aerial arrays for magnetic induction communication systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/010,807 US6134420A (en) 1996-11-01 1998-01-22 Vector measuring aerial arrays for magnetic induction communication systems
US09/010,807 1998-01-22

Publications (2)

Publication Number Publication Date
WO1999038273A2 WO1999038273A2 (en) 1999-07-29
WO1999038273A3 true WO1999038273A3 (en) 1999-11-11

Family

ID=21747529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/001342 WO1999038273A2 (en) 1998-01-22 1999-01-21 Vector measuring aerial arrays for magnetic induction communication systems

Country Status (3)

Country Link
US (1) US6134420A (en)
AU (1) AU2240699A (en)
WO (1) WO1999038273A2 (en)

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Also Published As

Publication number Publication date
US6134420A (en) 2000-10-17
AU2240699A (en) 1999-08-09
WO1999038273A2 (en) 1999-07-29

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