Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1996-12-16
1998-08-04
Strecker, Gerard R.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324225, 324247, 324260, G01N 2200, G01R 2908, G01R 3302
Patent
active
057899290
ABSTRACT:
A measuring method of the SAR is provided, which makes it possible to measure the SAR on the surface of a human body with high accuracy when the human body is approached to an antenna. After a probe for receiving at least one of two orthogonally-intersecting magnetic fields is prepared, a simulated biological body having approximately the same dielectric constant and approximately the same permeability as those of a human body is placed at a wanted point. A first magnetic field radiated from an antenna and a second magnetic field generated by reflection of the first magnetic field on the surface of the simulated biological body are separately measured at different measuring points by using the probe. A compensated magnetic field is calculated using the measured values of the first and second magnetic fields. A current distribution of the antenna is calculated by using the calculated values of the compensated magnetic field. The strength of an incident magnetic field on the surface of the simulated biological body is calculated by using the calculated current distribution of the antenna. The SAR is evaluated by using the calculated value of the strength of the incident magnetic field and a distance between the antenna and the simulated biological body.
REFERENCES:
patent: 5610519 (1997-03-01), Hankui et al.
Kuster et al., "Energy Absorption Mechanism by Biological Bodies in the Near Field of Dipole Antennas Above 300 MHz", IEEE Transactions on Vehicular Technology, vol. 41, No. 1, Feb. 1992, pp. 17-23.
J.D. Dyson, "Measurement of Near Fields of Antennas and Scatters", IEEE Transactions on Antennas and Propagation, vol. AP-21, No. 4, Jul. 1973, pp. 446-460.
NEC Corporation
Strecker Gerard R.
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