volume | PIER Journals

2012-02-08

Coupling Issues Associated with Electromagnetic Vulnerability (Emv) Testing of Vehicles Over Ground

Thomas H. Shumpert,

Dr. Thomas H. Shumpert

U. S. Army

Redstone Test Center

USA

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Marsellas L. Waller,

Dr. Marsellas L. Waller

Redstone Test Center (Provisional)

USA

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Steven H. Wong,

Dr. Steven H. Wong

AFRL/RCM

USA

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Robert W. Scharstein

Dr. Robert W. Scharstein

Electrical Engineering Department

University of Alabama

USA

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Progress In Electromagnetics Research, Vol. 124, 457-471, 2012

doi:10.2528/PIER11120707

Abstract

Electromagnetic Vulnerability (EMV) testing of ground vehicles and helicopters is (by necessity) performed in the immediate presence of ground surfaces (natural earth, asphalt, concrete, ship decks, and other finitely conducting grounds). The impact of the nature of these grounds on the EM coupling to the various vehicles being tested is the focus of this work. As one approach to addressing these issues quantitatively, personnel at Redstone Test Center Electromagnetic Environmental Effects (RTC/E3) Division have combined measurements on a semi-canonical physical structure along with EM modeling. In particular, a hollow 25 foot long, 4 foot diameter aluminum cylinder with a finite slot (~8 in wide) running along its entire length is positioned over (and near to) a finite conducting ground plane. Measurements of the electric fields produced both in the slot aperture and inside the hollow cylinder by an external log period dipole antenna (LPDA) positioned (broadside to the horizontal cylinder) approximately 5\,m away radiating both vertical and horizontal polarizations, respectively, are presented and discussed. The entire experimental setup (aluminum cylinder, finite aluminum ground plane, and radiating LPDA) are enclosed inside an RF anechoic chamber (inside dimensions between the respective tips of the anechoic pyramids of approximately 19 m х 9.0 m х 5.0 m). A moment method model (CARLOS) is also developed and the fields in the aperture and inside the cylinder are compared to the measured fields.

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Thomas H. Shumpert, Marsellas L. Waller, Steven H. Wong, and Robert W. Scharstein, "Coupling Issues Associated with Electromagnetic Vulnerability (Emv) Testing of Vehicles Over Ground," Progress In Electromagnetics Research, Vol. 124, 457-471, 2012.
doi:10.2528/PIER11120707

References

1. Electromagnetic Environmental Effects Requirements for Systems, Department of Defense Interface Standard, Oct. 1, 2010.

2. Electromagnetic Environmental Effects (E3) Performance and Verification Requirements, Aeronautical Design Standard, May 28, 1996.

3. Scharstein, R. W., M. L. Waller, and T. H. Shumpert, "Bounds on the accuracy of the measurement of plane-wave coupling into cavity structures using near-field sources," IEEE 2006 International Symposium on Electromagnetic Compatibility, EMC, 102-104, Aug. 14--18, 2006.

4. Scharstein, R. W., M. L. Waller, and T. H. Shumpert, "Near-field and plane-wave electromagnetic coupling into a slotted circular cylinder: Hard or TE polarization," IEEE Trans. on Electromagnetic Compatibility, EMC, 714-724, Nov. 2006.

5. Waller, M. L., T. H. Shumpert, and R. W. Scharstein, "Aperture coupling near-field cavity effects for electromagnetic testing with measurements on a slotted circular cylinder," IEEE 2010 International Symposium on Electromagnetic Compatibility, EMC, 62-66, Jul. 25--30, 2010.

6. Waller, M. L., T. H. Shumpert, R. W. Scharstein, and S. H. Wong, "Comparison of measured vs. modeled TE and TM field penetration into a slotted circular cylinder," Progress In Electromagnetics Research B, Vol. 28, 201-218, 2011.

7. Beren, J. A., "Diffraction of an H-polarized electromagnetic wave by a circular cylinder with an infinite axial slot," IEEE Trans. on Antennas and Propagation, 419-425, May 1983.
doi:10.1109/TAP.1983.1143072

8. Ziolkowski, R. W. and J. B. Grant, "Scattering from cavity-backed apertures: The generalized dual series solution of the concentrically loaded E-pol slit cylinder problem," IEEE Trans. on Antennas and Propagation, 504-528, May 1987.
doi:10.1109/TAP.1987.1144143

9. Department of Defense Instruction "Protecting personnel from electromagnetic fields,", No. 6055.11, Aug. 19, 2009.

10. IEEE standard for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz, IEEE C95.1-2005, Apr. 19, 2006.