Impact of TIM Dielectric Constant on EMI Radiation
The electromagnetic radiation from an IC was modeled using a vertically oriented loop source. This type of source has been shown to best emulate the actual radiation from an IC. Embedding the source in a material with a dielectric constant (dk) greater than 1 increases the total radiated power (TRP) vs the TRP of the antenna in a vacuum. The TRP increases as the dk increases. This phenomenon is still seen if the source is just below the material with dk>1 as it would be in a TIM application. This phenomenon is due to wavelength compression in the TIM material. This wavelength compression increases the effective size of the source in terms of a wavelength which increases the radiated power.
A TIM with absorptive properties (Coolzorb) could reduce the total radiated emissions however it has limited affect at lower frequencies due to the small physical volume in terms of a wavelength. At higher frequencies Coolzorb will give significantly improved performance in reducing radiated emissions.
Laird's extensive experience with both thermal and EMI management allows for a unique system level approach and understanding of thermal and EMI interactions.
Laird offer advanced system modeling and simulation as well as other multifunctional materials to help mitigate EMI and thermal design concerns.
Featured Whitepapers
-
Top 10 EMC Design Considerations
Infeneon -
-
Please wait...