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On the near fields produced by a perforated coaxial cable
Author(s) -
Knop C. M.,
Orseno G. S.
Publication year - 2000
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/1098-2760(20001020)27:2<101::aid-mop6>3.0.co;2-u
Subject(s) - coaxial cable , coaxial , conductor , usable , electrical engineering , phase (matter) , current (fluid) , engineering , flow (mathematics) , all dielectric self supporting cable , shielded cable , microwave , mechanics , physics , acoustics , optics , materials science , cable harness , telecommunications , cable theory , computer science , quantum mechanics , cable gland , world wide web , composite material
The near fields produced by a perforated coaxial cable (where the perforations can have an arbitrary shape, and where the spacing between perforations is very small compared to the wavelength in the cable) is here determined by a numerical integration of the axial currents which flow on the outside surface of the cable's outer conductor. It is first shown that these currents consist of three components, namely, a forward‐going current having a phase velocity equal to that in the cable, and forward‐ and backward‐going currents having (for all practical purposes, for convential cable‐jacketing materials and thickness) the phase velocity of light. The magnitude and phase of the latter currents cannot be readily determined a priori since they depend on the cable's mounting environment, as discussed. Rather, empirical values can be found to fit the circumstances, and to predict the near fields so as to agree with measured values. As such, this model is a phenomenological one, and it shows that the near fields produced, on a line parallel to the cable, are, in general, quite oscillatory in nature. Because of the small slot spacing, this type of cable produces usable near fields over a very broad frequency range (e.g., hundreds of kilohertz to about 3 GHz), and is employed for two‐way communication both indoors and outdoors. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 101–105, 2000.