Radiated emissions and immunity of microstrip transmission lines:theory and reverberation chamber measurements

The increasing complexity of electronic systems has introduced an increased potential for electromagnetic interference (EMI) between electronic systems. We analyze the radiation from a microstrip transmission line and calculate the total radiated power by numerical integration. Reverberation chamber methods for measuring radiated emissions and immunity are reviewed and applied to three microstrip configurations. Measurements from 200 to 2000 MHz are compared with theory, and excellent agreement is obtained for two configurations that minimize feed cable and finite ground plane effects. Emissions measurements are found to be more accurate than immunity measurements because the impedance mismatch of the receiving antenna cancels when the ratio of the microstrip and reference radiated power measurements is taken. The use of two different receiving antenna locations for emissions measurements illustrates good field uniformity within the chamber     

International comparison GT/RF 86-1 electric field strengths: 27MHz to 10 GHz

This paper describes the international comparison of electric field strength measurements at frequencies between 27 MHz and 10 GHz (GT/RF 86-1). The participating laboratories were NIST, Pilot Laboratory, USA, National Physical Laboratory, U.K., NMi Van Swinden Laboratorium, the Netherlands, Institute Elettrotecnico National, Italy, Laboratoire Central des Industries Electriques, France, Electrotechnical Laboratory, Japan, Korea Research Institute of Standards and Science, Korea, and Technical University of Wroclaw, Poland     

Electrically short dipoles with a nonlinear load, a revisitedanalysis

We reexamine the characteristics of electrically short dipoles with nonlinear loads and, specifically, the early work of Motohisa Kanda (1980, 1983). Although this topic has been examined in great detail in the past, some inconsistencies between numerical and analytical results are apparent, and these have not been previously addressed. We show that these inconsistencies were due to only periodic sampling of the analytic solution, and an insufficient number of iterations in the numerical solutions, and we give corrected results. Additionally, some of the more significant analytical results, which were once thought to be impractical due to their complexity, are numerically implemented. We also show that a simple approximation accurately describes the behavior of these electrically short dipoles over a wide range of frequency and amplitude