Title :
Reciprocity in EMI-EMC
Author :
Coren, Richard L.
Author_Institution :
Dept of Electr. & Comput. Eng., Drexel Univ., Philadelphia, PA, USA
Abstract :
The basis of and errors in interpreting the law of reciprocity are reviewed and applied to conducted and radiated electromagnetic interference-electromagnetic compatibility (EMI-EMC). Conditions for reciprocity include reversibility and passivity of elements in the reciprocal system. The law is expressed in circuit form and the reciprocal signals are clearly distinguished. Symmetric and asymmetric line filters are used as examples of reciprocity in conducted interference. It is shown that an incompletely shielded circuit can be regarded as an antenna, allowing one to establish radiation reciprocity between it and a measuring antenna. Some difficulties encountered in EMI-EMC measurements that give the impression of reciprocity being violated are discussed
Keywords :
antenna theory; electromagnetic compatibility; electromagnetic interference; magnetic shielding; EMI-EMC measurements; antenna; asymmetric line filters; conducted EMC; conducted EMI; conducted interference; incompletely shielded circuit; law of reciprocity; passivity; radiated EMC; radiation reciprocity; reciprocal signals; reciprocal system; reversibility; symmetric line filters; Antenna measurements; Circuits; Computer errors; Electrodynamics; Electromagnetic radiation; Filters; Geometry; Interference; Maxwell equations; Radio frequency;
Conference_Titel :
Electromagnetic Compatibility, 1991. Symposium Record., IEEE 1991 International Symposium on
Conference_Location :
Cherry Hill, NJ
Print_ISBN :
0-7803-0158-7
DOI :
10.1109/ISEMC.1991.148210
