A Transfer Function based Calculation Method for Radio Frequency Interference


A transfer function based calculation method is proposed to estimate radio frequency interference (RFI) problems. The closed-form equations are analytically derived from Maxwell's equations and the reciprocity theorem. The derived equations can clearly decompose the RFI problem into two parts: the noise source and the coupling transfer function to the antenna. Based on derivations, a transfer function concept is proposed to quantify the coupling coefficient from each unit dipole moment to the victim antenna. The transfer functions can be easily obtained from S-parameter measurements. The proposed method is validated through numeric simulations and real cellphone experiments. Engineering insights drawn from the method are also discussed. Overall, the proposed method is accurate, fast, and can provide physical insights for practical designs.

Meeting Name

IEEE Symposium on Electromagnetic Compatibility, Signal and Power Integrity (2018: Jul-Aug, Singapore and Long Beach, CA)


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory


This work was supported in part by the National Science Foundation under Grant IIP-1440110. This paper was presented in part at the IEEE Symposium on Electromagnetic Compatibility, Signal and Power Integrity, Singapore and Long Beach, CA, USA, July/August 2018.

Keywords and Phrases

Antenna; Dipole Moment Model; Liquid Crystal Display (LCD); Mobile Phone; Radio Frequency (RFI); Reciprocity; Transfer Function

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


File Type





© 2019 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 2019