EMI Shielding Composites

Ultra-Lightweight EMI Shielding Materials

A family of materials has been developed which are compatible with structural composites and have attenuations in excess of 100 dB at frequencies above 0.1 GHz. These tailorable materials have been produced with densities lower than 0.6 gm/cm3. They can be cast to shape or co-processed with a structural composite. The approach makes use of metallized hollow microsphere fillers and has investigated varying filler fraction as well as effects of various types and sizes of filler particle.

samples
spheresl

Related Publications

Journal Articles

  • Olivero, D.A. and Radford, D.W., “Non-Contact Percolation and Conductivity in Microsphere Composites”, Journal of Advanced Materials, Vol. 31, No.1, January 1999, pp.42 – 50.
  • Olivero, D.A. and Radford, D.W., “A Multiple Percolation Approach to EMI Shielding Composites Incorporating Conductive Fillers”, Journal of Reinforced Plastics and Composites, Vol. 17, No.8, 1998, pp.674 – 690.
  • Olivero, D.A. and Radford, D.W., “Integrating EMI Shielding into Composite Structure”, SAMPE Journal, Vol.33, No.1 1997, pg 51.
  • Gray, S., Ganchev, S., Qaddumi, N., Beauregard, G., Radford, D., and Zoughi, R., “Porosity Level Estimation in Polymer Composites Using Microwaves”, Materials Evaluation, Vol. 53, No.4, March 1995, pp.404 – 408.
  • Radford, D.W., “Volume Fraction Effects in Ultra Lightweight Composite Materials for EMI Shielding”, Journal of Advanced Materials, Vol. 26, No.1, October 1994, pp.45 – 53.
  • Radford, D.W. and Cheng, B.C., “Metallized Microballoon Filled Composite EMI Shielding Materials”, Journal of Testing and Evaluation, JTEVA, Vol. 21, No.5, September 1993, pp.396 – 401.
  • Radford, D.W. and Cheng, B.C., “Ultra-Lightweight Composite Materials for EMI Shielding”, SAMPE Quarterly, Vol. 24, No.4, July 1993, pp.54 – 61.

Conference Proceedings

  • Dummer, D.L. and Radford, D.W., “A 3-D Percolation Model for Conductive Particulate Composites”, 36th International SAMPE Technical Conference, SanDiego, CA, Nov. 15 – 18, 2004.
  • Olivero, D.A. and Radford, D.W., “Integrating EMI Shielding into Composite Structure”, 28th International SAMPE Technical Conference, Seattle, WA, Nov. 4 – 7, 1996.
  • Radford, D.W. and Sadeh, W.Z., “Role of Volume Fraction in Composite EMI Shielding”, IAF 94 I.5.210 45th Congress of the International Astronautical Federation, Jerusalem, Israel, Oct. 9 14, 1994.
  • Radford, D.W., Sadeh, W.Z., and Cheng, B.C., “Composite Materials Microstructure for Radiation Shielding”, IAF 92 0324 43rd Congress of the International Astronautical Federation, Washington, D.C., Sept. 1992.
  • Radford, D.W., Sadeh, W.Z., and Cheng, B.C., “Composite Materials for Structures on Planetary Surfaces”, Space ’92, Engineering, Construction, and Operations in Space, American Society for Civil Engineers, Denver, CO., June 1992.
  • Radford, D.W., Sadeh, W.Z., and Cheng, B.C., “Materials Issues for Lunar/Martian Structures”, IAF 91 302 42nd Congress of the International Astronautical Federation, Montreal, CANADA, October 1991.
  • Radford, D.W. and Cheng, B.C., “Ultra-Lightweight EMI Shielding Materials”, 6th Technical Conference – Composite Materials, Mechanics and Processing, American Society for Composites, Albany, NY., October 1991, (Technomic Publishing Co.).

Related Theses

  • Cheng, B.C., “Ultra-Lightweight Composite Materials for EMI Shielding”, MS Thesis, Colorado State University, Fall 1993.
  • Olivero, D.A., “Percolation in Particulate Composites for EMI Shielding”, MS Thesis, Colorado State University, Spring 1997.