Characteristics of transverse electric and magnetic field transmission cells at extremely low frequencies | Zendy

Wood A. W. | Zendy; Joines W. T. | Zendy; Blackman C. F. | Zendy

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Characteristics of transverse electric and magnetic field transmission cells at extremely low frequencies

Author(s) -

Wood A. W.,

Joines W. T.,

Blackman C. F.

Publication year - 1987

Publication title -

bioelectromagnetics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.435

H-Index - 81

eISSN - 1521-186X

pISSN - 0197-8462

DOI - 10.1002/bem.2250080409

Subject(s) - magnetic field , electric field , transverse plane , physics , transverse magnetic , electrical impedance , electromagnetic radiation , electromagnetic field , nuclear magnetic resonance , optics , acoustics , engineering , structural engineering , quantum mechanics

Transverse electric and magnetic field (TEM) cells are often designed to subject samples to electromagnetic radiation of intrinsic impedance (E/H) that is the same as in free space, 377 ω. Earlier work has shown this value to be correct for the RF region above about 2 kHz. In this study, measurements of magnetic fields in the extremely low frequency regions and at DC indicate the E/H ratio to be around 300 ω for frequencies less than 2 kHz in cells of a particular design. This lower value indicates that care should be taken in estimating AC magnetic field intensities from electric field measurements in TEM cells at frequencies below 2 kHz.

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