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System Level Radiated Emission Mitigation at High Frequencies when Other Methods are Not Effective Enough

Ali Khoshniat  (PhD Student, Santa Clara University)

Ramesh Abhari  (Adjunct Associate Professor, Department of Electrical Engineering, Santa Clara University)

Location: Ballroom A

Date: Wednesday, January 29

Time: 12:00pm - 12:45pm

Track: 11. Electromagnetic Compatibility/Mitigating Interference

Format: Technical Session

Pass Type: 2-Day Pass, All-Access Pass, Alumni All-Access Pass - Get your pass now!

Vault Recording: TBD

Audience Level: All

Systems with high-speed digital interfaces often pose challenges in passing the radiated emission compliance tests. These tests are usually conducted at the late stages of product development. In case of compliance failure, conventional emission reduction remedies are used which are not always effective. In this paper, the design methodology for a custom-designed absorber that targets the frequency of compliance failure is introduced. The designed absorber is a Frequency Selective Surface (FSS) that is added inside the system case box. Both simulation and in-house measurement results demonstrate mitigation of radiated emission at the failure frequency by up to 6 dB.


- Understanding of the source and frequency of emission from high speed digital interfaces
- Design methodology for an absorbing Frequency Selective Surface (FSS) that targets the frequency of the emission
- Overview of an in-house radiation measurement setup and testing methodology to evaluate the FSS effectiveness

Intended Audience

The needed basic concepts will be reviewed. Some knowledge of transmission line theory, and EMC radiated emission testing would be helpful.

Presentation Files