Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-04-03
1999-09-28
Cumming, William
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
330285, H03G 310
Patent
active
059603461
ABSTRACT:
A novel method and apparatus are described for reducing the effect that magnetic field emissions from a radio telephone may have on devices sensitive to time-varying magnetic fields. The variance of the magnetic field is smoothed by the addition of a smoothing capacitor having a time constant significantly longer than the TDMA time frame which is connected in parallel with the transmitter. In addition, a counter-balancing magnetic field is generated by a field canceling loop connected in series with the transmitter which causes current to flow in a path approximately opposite from the path the current flows through the battery, in roughly parallel plane. The current flowing through the field canceling loop generates a magnetic field approximately coaxial with, and opposite in polarity from, the magnetic field generated by current flowing through the battery, partially negating the latter. Utilization of the method and apparatus result in a reduction in the effective magnitude of the time-varying magnetic field outside the telephone.
REFERENCES:
patent: 5126688 (1992-06-01), Nakanishi et al.
patent: 5842115 (1998-11-01), Dent
Cumming William
Ericsson Inc.
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