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IEEE Transactions on Antennas and Propagation
Volume 47 Number 4, April 1999

Table of Contents for this issue

Complete paper in PDF format

Measurement and Prediction of Helix-Loaded Chiral Composites

Colin R. Brewitt-Taylor, Peter G. Lederer, Frank C. Smith, and Sajad Haq

Page 692.

Abstract:

A method is described for the extraction of the permittivity, permeability, and chirality of composite chiral materials, using measurements of reflection and transmission in a circular waveguide. This has been applied to a number of helix-loaded composites, in the frequency band 8-12 GHz. The properties of these composites have also been computed from the helix geometry and other basic information. The theory correctly predicts the frequency of the half-wavelength resonance observed, the relative magnitude of the constitutive parameters, and the low-frequency dielectric constant. But it has been found necessary to adjust the host-medium loss to obtain the correct absolute magnitudes. This agreement provides a confirmation that the theory is basically sound and so assists in discovering what chiral parameters are practically obtainable and in exploring applications of chiral materials.

References

  1. V. K. Varadan, V. V. Varadan, and A. Lakhtakia, "On the possibility of designing anti-reflection coatings using chiral composites," J. Wave-Material Interaction, vol. 2, no. 1, pp. 71-81, 1987.
  2. H. Cory and I. Rosenhouse, "Minimization of reflection coefficient at feed of radome-covered reflector antenna by chiral device," Electron. Lett., vol. 27, no. 25, pp. 2345-2347, 1991.
  3. P. Pelet and N. Engheta, "The theory of chirowaveguides," IEEE Trans. Antennas Propagat. vol. 38, pp. 90-98, 1990.
  4. D. L. Jaggard, J. C. Liu, A. Grot, and P. Pelet, "Thin wire antennas in chiral media," Electron. Lett., vol. 27, pp. 243-244, 1991.
  5. H. Cory, "Chiral devices--An overview of canonical problems," J. Electromag. Waves Appl., vol. 9, pp. 805-829, 1995.
  6. C. R. Brewitt-Taylor, "Modeling of helix-loaded chiral radar absorbing layers," in Proc. PIERS-93 Conf., Pasadena, CA, July 12-16, 1993, p. 529.
  7. --, "Modeling of helix-loaded chiral radar-absorbing layers," in PIERS Book Series Vol. 9, Bianisotropic and Bi-Isotropic Media and Applications, A. Priou, Ed., 1994.
  8. S. Haq and D. L. Tunnicliffe, "Fabrication of chiral composites for waveguide and free-space measurements," in Proc. Chiral-95 Conf., Pennsylvania State University, Oct. 11-14, 1995, pp. 21-26.
  9. R. Ro, V. V. Varadan, and V. K. Varadan, "Electromagnetic activity and absorption in microwave chiral composites," in Proc. Inst. Elect. Eng., 1992, vol. 139, pt. H, no. 5, pp. 441-448.
  10. V. V. Varadan, R. Ro, and V. K. Varadan, "Measurement of the electromagnetic properties of chiral composite materials in the 8-40 GHz range," Radio Sci., vol. 29, no. 1, pp. 9-22, 1994.
  11. J. Reinert, G. Busse, and A. F. Jacob, "A procedure to extract the chirality parameter from waveguide measurements," in Proc. Chiral-95 Conf., Pennsylvania State University, June 1995, pp. 9-12.
  12. G. Busse, J. Reinert, M. Klemt, and A. F. Jacob, "On chirality measurements in circular waveguides," in Advances in Complex Electromagnetic Materials, A. Priou Ed., 1997, pp. 333-339.
  13. C. R. Brewitt-Taylor, P. G. Lederer, and F. C. Smith, "Measurement of chiral media in a circular waveguide," in Proc. Chiral-94 Conf., Perigueux, France, May 18-20, 1994, pp. 413-416.
  14. A. H. Sihvola and I. V. Lindell, "Bi-isotropic constitutive relations," Microw. Opt. Technol. Lett., vol. 4, no. 8, pp. 295-297, 1991.
  15. --, "Chiral Maxwell-Garnet mixing formula," Electron. Lett., vol. 26, no. 2, pp. 118-119, 1990.
  16. R. Hollinger, V. V. Varadan, and V. K. Varadan, "Eigenmodes in a circular waveguide containing an isotropic chiral material," Radio Sci., vol. 26, no. 5, pp. 1335-1344, 1991.
  17. G. Busse and A. F. Jacob, "Lossy chiral slabs in circular waveguide," in Proc. Inst. Elect. Eng. Micro. Antennas and Propag., 1996, vol. 143, no. 1, pp. 51-56.
  18. L. R. Arnaut and L. E. Davis, "On planar chiral structures," in Proc. PIERS-95 Conf., Seattle, WA, July 24-28, 1995, p. 165.
  19. B. Sauviac, F. Mariotte, J-P. Heliot, A. Riboulet, "Numerical modeling of heterogeneous materials with dielectric or magnetic chiral inclusions," in Proc. Chiral'95 Conf., Pennsylvania State University, Oct. 11-14, 1995, pp. 35-41.
  20. F. Guerin, P. Bannelier, and M. Labeyrie, "Scattering of electromagnetic waves by helixes and application to the modeling of chiral composites--Part I: Simple effective medium theories, and--Part II: Maxwell-Garnet treatment," J. Phys. D: Appl. Phys., vol. 28, pp. 623-642 and pp. 643-656, 1995.
  21. R. Luebbers, H. S. Langdon, F. Hunsberger, and C. F. Bohren, "Calculation and measurement of the effective chirality parameter of a composite chiral material over a wide frequency band," IEEE. Trans. Antennas Propagat., vol. 43, pp. 123-130, Feb. 1995.
  22. G. J. Burke, "Numerical electromagnetic code NEC-4--Method of moments," Document UCRL-MA-109338, Lawrence Livermore National Laboratory, 1992.
  23. I. P. Theron and J. H. Cloete, "The electric quadrupole contribution to the circular birefringence of nonmagnetic anisotropic chiral media: A circular waveguide experiment," IEEE Trans. Antennas Propagat., vol. 44, pp. 1451-1459, Aug. 1996.
  24. K. W. Whites, "Full-wave computation of constitutive parameters for lossless composite chiral materials," IEEE Trans. Antennas Propagat., vol. 43, pp. 376-384, Apr. 1995.
  25. S. Cornbleet, Microwave Optics: The Optics of Microwave Antenna Design.London: Academic, 1976.
  26. F. Guerin, "Microwave chiral materials: A review of experimental studies and some results on composites with ferroelectric ceramic inclusions," in PIERS Book Series Vol. 9, Bianisotropic and Bi-Isotropic Media and Applications, A. Priou, Ed., 1994, pp. 219-263.
  27. K. F. Lindman, Ann. Phys., vol. 63, p. 621, 1920.
  28. --, Ann. Phys., vol. 69, p. 270, 1922.
  29. I. Tinoco and M. P. Freeman, "The optical activity of oriented copper helixes--Part I: Experimental," J. Chem. Phys., vol. 61, pp. 1196-1200, 1957.
  30. A. G. Smith, J. H. Cloete, and I. P. Theron, "The accuracy of a free-space system for measuring the electromagnetic properties of microwave chiral materials," in Proc. Chiral'95 Conf., Pennsylvania State University, Oct. 11-14, 1995, pp. 13-16.
  31. V. V. Varadan, A. Lakhtakia, and V. K. Varadan, "Equivalent dipole moments of helical arrangements of small, isotropic, point-polarizable scatterers: Application to chiral polymer design," J. Appl. Phys., vol. 63, no. 2, pp. 280-284, 1988.