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Power balance and diffusion models for electromagnetic shielding

Monday 13 March 2017, 2.00PM to 15:00

Speaker(s): Dr John Dawson, University of York


Radio communication is a key part of our day to day lives. Most of us have multiple transmitters and receivers in our pocket or on our desk. Yet few give any thought to how intentional signals of our communications devices interact with the other electronic systems around us. All of them generate electromagnetic signals which may interfere with our communications systems and many of them can be affected by the signal strength available from even low power transmitters.  Electromagnetic shielding of electronic systems is therefore an important aspect of ensuring that everything works together so that we can achieve Electromagnetic Compatibility between different systems.

At high frequencies, full wave numerical modelling of electromagnetic shielding problems requires a large computer resource. The power balance method offers the possibility of a fast and simple computation for coupling into electrically large enclosures and their contents. Energy diffusion models offer a better solution with a little more computational effort.  The methods can also be applied to acoustic isolation and coupling problems.

In this seminar I will present an introduction and historical perspective on the development of the techniques and an overview of recent research in the Applied Electromagnetics Lab in applying the concepts to evaluation of the shielding effectiveness of enclosures and coupling of energy into printed circuit boards.

Location: PT006

Admission: Free


Telephone: 4485

Administrative Enquiries:

Please contact Helen Smith, Admisssions and Research Student Office, for more information.


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