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IEEE Microwave and Guided Wave Letters
Volume 10 Number 11, November 2000

Table of Contents for this issue

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The Electromagnetic Properties of Re-Entrant Dielectric Honeycombs

F. C. Smith, F. Scarpa and B. Chambers

Page 451.

Abstract:

Dielectric honeycombs are cellular materials often used in applications that require structural and electromagnetic characteristics, e.g., in LO (low observable) and radome components. A re-entrant (or auxetic) honeycomb is a cellular material with structural properties that are superior to those of a conventional honeycomb. By employing the finite-difference time-domain (FDTD) technique with periodic boundary conditions, the electromagnetic properties of re-entrant honeycombs are determined and compared to those of a conventional honeycomb. Re-entrant honeycombs are shown to have substantially superior electromagnetic properties. Measured permittivity data are used to substantiate the conclusions based on predicted FDTD data. The use of re-entrant honeycombs,rather than conventional honeycombs, in LO and radome applications can yield improved structural and electromagnetic performance.

References

  1. L. J. Gibson and M. F. Ashby, Cellular Solids-Structure and Properties, 2nd ed.   Cambridge: U.K.: Cambridge Press, 1997.
  2. J. Bettermann and H. Wentzel, "Design features and test of low observable structures for large aircraft", in Proc. 3rd Int. Conf. Electromagnetics in Aerospace Applications, Torino, Italy,September 1993, pp.  14- 17. 
  3. E. F. Kuester and C. L. Holloway, "Comparison of approximations for effective parameters of artificial dielectrics", IEEE Trans. Microwave Theory Tech, vol. 38, pp.  1752-1755, Nov.  1990.
  4. H. G Allen, Analysis and Design of Structural Sandwich Panels, Oxford: U.K.: Pergamon, 1969.
  5. F. C. Smith, "Effective permittivity of dielectric honeycombs", Proc. Inst. Elect. Eng., Microw., Antennas, Propagat., vol. 146, no. 1, pp.  55-59, February  1999.
  6. B. D. Caddock, K. E. Evans and I. G. Masters, "Honeycomb cores with a negative poisson's ratio for use in sandwich panels", in Proc. Int. Conf. Cellular Materials, Honolulu, HI, 1991,Section 1-11.
  7. F. Scarpa and G. Tomlinson, "On static and dynamic design criteria of sandwich structures with a negative Poisson's ratio core", J. Appl. Mech. Eng, vol. 5, no. 1, pp.  207-222, 2000.
  8. F. Scarpa and G. Tomlinson, "Vibroacoustic behavior of novel sandwich structures with negative Poisson's ratio core", in Proc. ISMA23, Leuven, Belgium,Sept. 16-18 1998, pp.  671-675. 
  9. F. Scarpa and G. Tomlinson, "Theoretical characteristics of the vibration of sandwich plates with in-plane negative Poisson's ratio values", J. Sound Vibr., vol. 230, no. 1, pp.  45-67, 2000.
  10. F. Scarpa and P. J. Tomlin, "On the transverse shear modulus of negative Poisson's ratio honeycomb structures", Fat. Fract. Eng. Mat. Struct., to be published.
  11. Hewlett-Packard, "Materials measurement-Measuring the dielectric constant of solids with the HP 8510 network analyzer", Prod. Note 8510-3, 1985.