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ABSTRACT
For the transmission line response excited by an electrically short dipole inside a rectangular cavity, a SPICE-compatible broadband Foster type equivalent circuit is presented. The electric field inside a cavity is represented by the eigenmode decomposition of Helmholtz equation, while the current of transmission line is expanded using the eigenmode of transmission line equation. The field-to-line coupling effect is described by the Agrawal formula. The convergence of the circuit is accelerated by the extraction of quasi-static inductances and capacitances. The validity and efficiency of the presented method is verified both in frequency and time domain. Also, the effects of lossy filling material are discussed. Besides, in order to show the aggravation effect of metallic cavity on the electromagnetic interference, the induced currents on the transmission line with and without a metallic casing are given and compared.
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No potential conflict of interest was reported by the authors.
Additional information
Notes on contributors
Jinpeng Yang
Jinpeng Yang is currently working toward the Ph.D. degree at Jilin University. His research interests include transmission line modelling and statistical electromagnetics.
Xiaoying Sun
Xiaoying Sun is currently a professor, Yangtze River scholar, Dean of the Department of Communication Engineering, Jilin University. His current research interests include vehicle electromagnetic compatibility, array signal processing and passive sources localization.
Yu Zhao
Yu Zhao is currently an associate professor with the Department of Communication Engineering, Jilin University. Her current research interest is electromagnetic compatibility.
Jian Chen
Jian Chen is currently an associate professor with the Department of Communication Engineering, Jilin University. His research interests include array signal processing and electromagnetic compatibility.
Xuezhi Yan
Xuezhi Yan is currently an associate professor with the Department of Communication Engineering, Jilin University. His current research interest is electromagnetic compatibility and passive sources localization.