Comparison of Measured vs Modeled TE and TM Field Penetration into a Slotted Circular Cylinder
REDSTONE TEST CENTER REDSTONE ARSENAL AL
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In implementing electromagnetic vulnerability EMV testing on operational helicopters fielding a variety of avionic, communication, and weapons systems, the testing levels as spelled out in MIL-STD-464A require most test labs to position the high power source antennas unreasonably close to the test item sometimes within 2 m. Questions naturally arise concerning the efficacy of such testing with respect to both the manner of coupling of the fields to the helicopter systems as well as the levels required to achieve reasonable confidence in the coupling effects. This paper presents a comparison of the electric fields interior to an axially slotted circular cylinder and the fields in the slot aperture as a function of the distance from the source to the test item. Also, these measured interior and aperture fields are compared to two different mathematicalnumerical models of the conducting cylinder with an axial slot running the length of the cylinder. Additional measurements are presented for the yields interior to a finite cylinder with conducting endcaps and a significantly reduced slot of finite length. Comparisons to one of the mathematicalnumerical models for this finite length cylinder with finite length slot are presented also.
- Electromagnetic Shielding
- Radiofrequency Wave Propagation