Development of the Electromagnetic Wave Absorber for 94 GHz Radar Sensors Using Permalloy

  • Published : 2006.09.30

Abstract

In this paper, we fabricated the EM wave absorber for 94 GHz radar sensors using Permalloy of magnetic material with chlorinated polyethylene (CPE), and S-parameter was measured. The complex relative permittivity and permeability are calculated by the measured data. Absorption abilities are simulated according to different thickness of the EM wave absorbers, and the EM wave absorber was manufactured based on the simulated design. Simulated and measured results agree very well. As a result, we developed the EM wave absorber with the thickness of 1.15 mm which has an absorption ability of 18 dB at 94 GHz.

Keywords

Absorption ability;EM wave absorber;Permeability;Permittivity;Radar

References

  1. David M. Pozer, Microwave Engineering - 3rd ed., J. Wiley & Sons, 2005, pp. 57-59
  2. Sang-Hyun Moon et aI., 'Development of composite Ba ferrite EM wave absorbers for GHz frequency,' J. Korea Electromag. Engin. Soc., vol.14, no.12, Dec. 2003, pp.1329-1334
  3. T. Soh, O. Hashmoto, 'A Study on Millimeter-Wave Absorber Coating for V Band and W Band,' Trans. IEICE, vol.J84-B, no.8, Aug. 2001, pp. 1523-1528
  4. O. Hashmoto, Y. Shimizu, 'A Measurement of the Complex Permittivity Tensor by a Standing-Wave Method in a Rectangular Waveguide,' IEEE Trans. Electromag. Compat., vol. 29, no.2, May 1987, pp. 141-149 https://doi.org/10.1109/TEMC.1987.304353
  5. Willian H. Haydl, Markus Neumann, Ludger Verweyen et aI., 'Single-Chip Coplanar 94-GHz FMCW Radar Sensors,' IEEE Microwave and Guided Wave Letters, vol. 9, no. 2, Feb. 1999, pp. 73-75 https://doi.org/10.1109/75.755051
  6. O. Hashmoto, Introduction to Wave Absorber Tokyo:Morikita Shuppan, 1997, pp. 79-81
  7. Y. Natio, Electromagnetic Wave Absorbers, Tokyo:New Ohm, 1987, pp. 69-76
  8. Y. Kotsuka, H. Yamazaki, 'Fundamental Investigation on a Weakly Magnetized Ferrite Absorber,' IEEE Trans. Electromag. Compat., vol.42, no.2, May 2000, pp.116-124 https://doi.org/10.1109/15.852405
  9. C. P. Neo, V. K. Varadan, 'Optimization of Carbon Fiber Composite for Microwave Absorber,' IEEE Trans. Electromag. Compat., vol. 46, no. 1, Feb. 2004, pp. 102-106 https://doi.org/10.1109/TEMC.2004.823618