Electromagnetic excitation of a wire enclosed in a rectangular cavity by a plane wave incident on a small aperture

B. L. Ma, I. T. Lu

Research output: Contribution to journalArticle

Abstract

Analysis of the electromagnetic excitation of a conducting wire, enclosed in a rectangular cavity, by an incident plane wave through a small aperture is presented. Two approaches, the method of moments and the equivalent circuit theory, are used to calculate resonant frequencies and the wire current. Bethe’s small–hole theory and thin wire approximation are employed to simplify the numerical computations. When the plane wave excites a resonant mode of the cavity, substantial numerical simplifications are afforded. Under resonance condition, the wire current is much larger than it would be if the wire was in free space. Comparisons of various physical quantities evaluated by these two approaches are made.

Original languageEnglish (US)
Pages (from-to)311-324
Number of pages14
JournalJournal of Electromagnetic Waves and Applications
Volume4
Issue number4
DOIs
StatePublished - 1990

Fingerprint

plane waves
apertures
wire
Wire
electromagnetism
cavities
excitation
method of moments
Circuit theory
Method of moments
simplification
equivalent circuits
Equivalent circuits
resonant frequencies
Natural frequencies
conduction
approximation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy(all)

Cite this

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abstract = "Analysis of the electromagnetic excitation of a conducting wire, enclosed in a rectangular cavity, by an incident plane wave through a small aperture is presented. Two approaches, the method of moments and the equivalent circuit theory, are used to calculate resonant frequencies and the wire current. Bethe’s small–hole theory and thin wire approximation are employed to simplify the numerical computations. When the plane wave excites a resonant mode of the cavity, substantial numerical simplifications are afforded. Under resonance condition, the wire current is much larger than it would be if the wire was in free space. Comparisons of various physical quantities evaluated by these two approaches are made.",
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AB - Analysis of the electromagnetic excitation of a conducting wire, enclosed in a rectangular cavity, by an incident plane wave through a small aperture is presented. Two approaches, the method of moments and the equivalent circuit theory, are used to calculate resonant frequencies and the wire current. Bethe’s small–hole theory and thin wire approximation are employed to simplify the numerical computations. When the plane wave excites a resonant mode of the cavity, substantial numerical simplifications are afforded. Under resonance condition, the wire current is much larger than it would be if the wire was in free space. Comparisons of various physical quantities evaluated by these two approaches are made.

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