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Light-Matter InteractionPhysics and Engineering at the Nanoscale, Second Edition$
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John Weiner and Frederico Nunes

Print publication date: 2017

Print ISBN-13: 9780198796664

Published to Oxford Scholarship Online: March 2017

DOI: 10.1093/acprof:oso/9780198796664.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 22 January 2022

The Classical Charged Oscillator and the Dipole Antenna

The Classical Charged Oscillator and the Dipole Antenna

(p.100) 5 The Classical Charged Oscillator and the Dipole Antenna
Light-Matter Interaction

John Weiner

Frederico Nunes

Oxford University Press

Chapter 5 presents the classical charged oscillator and the dipole antenna. These two closely related topics are presented for their intrinsic interest as well as an illustration of the principles in the foregoing chapters. First electromagnetic wave propagation in the near- and far-fields from a proto-antenna, an oscillating charge, is presented. It is shown how a real, half-wave antenna can be built up from an array of oscillating charges and how a phased array of real antennas can be used to concentrate the spatial direction of emission or reception. The notions of intrinsic antenna impedance, impedance matching, gain and directional gain are introduced. These concepts lay the groundwork for phased-array antennas implemented at the nanoscale.

Keywords:   antenna, oscillator, dipole antenna, array, impedance, gain, directional gain

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