Capacitor with magnetic dielectric

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SUMMARY

The discussion centers on the implications of using a soft magnetic material, specifically ferrite, as a dielectric in a parallel plate capacitor. The findings indicate that the relative permittivity of such capacitors is approximately 14, suggesting limited effectiveness. Additionally, ferrite materials exhibit significant losses at higher frequencies due to their partial conductivity. This combination results in a capacitor that is not optimal for high-frequency applications.

PREREQUISITES
  • Understanding of capacitor fundamentals, including capacitance and dielectric materials.
  • Knowledge of magnetic materials, specifically ferrites and their properties.
  • Familiarity with electrical characteristics of AC and DC circuits.
  • Basic grasp of permittivity and its impact on capacitor performance.
NEXT STEPS
  • Research the electrical characteristics of capacitors with ferrite dielectrics.
  • Explore the effects of frequency on the performance of capacitors with lossy dielectrics.
  • Investigate different types of ferrite materials and their conductivity properties.
  • Learn about alternative dielectric materials that enhance capacitor performance.
USEFUL FOR

Electrical engineers, materials scientists, and anyone involved in capacitor design and optimization, particularly in high-frequency applications.

Stephen03
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Odd question, would anybody know what would happen if a parallel plate capacitor (good conductor) had a soft magnetic material (fairly poor conductor) as a dielectric? What would be the DC/AC electrical characteristics of this?
 
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Stephen03 said:
Odd question, would anybody know what would happen if a parallel plate capacitor (good conductor) had a soft magnetic material (fairly poor conductor) as a dielectric? What would be the DC/AC electrical characteristics of this?

Welcome to the PF.

What are your thoughts? What would the effect on the value of the capacitance be? What would happen to the lossy characteristics of the capacitor? Why?
 
berkeman said:
Welcome to the PF.

What are your thoughts? What would the effect on the value of the capacitance be? What would happen to the lossy characteristics of the capacitor? Why?

Hi berkeman,
I have actually found an article that I wasn't able to find yesterday describing the permittivity of a capacitor with a ferrite as a dielectric. Here is the link (http://tdserver1.fnal.gov/tdlibry/TD-Notes/2007 Tech Notes/TD-07-014.pdf). The results were that the relative permittivity was close to 14. Assuming this fairly accurate with all ferrite materials, this wouldn't be that good of a capacitor. It is also fairly lossy at higher frequencies. This makes sense as ferrite materials are still somewhat conductive. Off the top of your head, what ferrite would you say has the lowest conductivity?
 

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