NDLI: On the coupling of energy in parallel plane waveguides

Content Provider	IEEE Xplore Digital Library
Author	Hale, L.C.
Copyright Year	1964
Abstract	Many EM phenomena may be framed in the context of the excitation and propagation of waves between parallel conducting planes at frequencies below f/sub 0/ where only the TEM or "zero" mode propagates. For a localized source, propagation is in the radial TEM mode, described by Hankel functions, with E and H decreasing much slower in the far field (r/sup -1/2/) than free-space radiation (r/sup -1/). The excitation of these waves has frequently been underestimated. Source currents below the TEM cutoff frequency f/sub 0/ couple capacitively, with a coupling factor determined by a simple distance ratio. Higher frequency sources are more complex, but computer analysis shows that rapid transients launch wavelets whose frequency is somewhat below f/sub 0/ to satisfy quasistatic boundary conditions, with total energy comparable to that "radiated" at the source frequencies. The combination of strong coupling and slow decrease with distance may help explain "anomalously" large EM signals over a broad range of frequencies and geometric scales, from ELF energy between the Earth and ionosphere which may sustain for milliseconds the mesospheric optical emissions known as "red sprites" to VHF energy in portable electronic devices (PEDs) which may have sometimes interfered with avionic systems. The coupling of energy into the boundaries is thought to be due largely to excess charge momentarily released into the conductors by passing wavelets.
Sponsorship	IEEE Electromagnetic Compatibility Society
Starting Page	513
Ending Page	518
Page Count	6
File Size	878546
File Format	PDF
ISSN	00189375
Volume Number	38
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Planar waveguides Optical waveguides Cutoff frequency Transient analysis Wavelet analysis Boundary conditions Optical coupling Ground penetrating radar Geophysical measurement techniques Earth
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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