Extension of Fresnel Near-Field Region by Single-Cycle Sinusoidal Pulses

Abstract

A circular conducting disk antenna is excited by three uniform current waveforms namely, a very high frequency CW sin& , a single-cycle sinwO1, and a single-cycle coswOt. The energy per cycle associated with each of these waveform is taken to be the uM. From the behavior of the radiated energy densities along the axis of the disk, it is found that if the CW waveform extends the near field to unit distance, then the corresponding distances are 1. 375 and 3.75 for the single-cycle sinwOt and the single-cycle coswOt respectively. These results show that the method of energy transfer to a large distance along the axis of an aperture (or disk) becomes more efficient when a short pulse, instead of a CW source, is applied. This will have applications wherever a transmission of high intensity beam of energy far away from a radiating device is needed.

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Document Details

Document Type
Technical Report
Publication Date
Aug 21, 1992
Accession Number
ADA254736

Entities

People

  • S. N. Samaddar

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Electric Fields
  • Electromagnetic Fields
  • Electromagnetic Radiation
  • Energy
  • Energy Transfer
  • Far Field
  • Frequency
  • Fresnel Zones
  • Intensity
  • Near Field
  • Radar
  • Radiation
  • Two Dimensional
  • Very High Frequency
  • Wave Propagation
  • Waveforms
  • Waves

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering