Generation of Standard Electromagnetic Fields in a TEM (Transverse Electromagnetic) Cell

摘要

The paper documents the facilities and procedures used by the National Bureau of Standards to calibrate radio frequency electric field probes using a transverse electromagnetic (TEM) cell. The advantages, limitations, and physical characteristics of TEM cells are presented. Impedance, field uniformity, and mode structure, critical aspects of a cell as a standard field enclosure, are discussed. The paper concludes with sections on setup and measurement procedures for users, uncertainty in the standard field, and statistical control of the calibration system. Copies of key references are included to provide ready access to the details of topics summarized in the text.