Chapt4b

Chapt4b - EEE 443 Antennas for Wireless Communications by...

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1 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas EEE 443 Antennas for Wireless Communications by Constantine A. Balanis Lecture #13 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Chapter 4 Linear Wire Antennas Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas 4 Linear Wire Antennas Chapter Effects Ground Conductors Perfect Infinite on or Near Elements Linear Dipole Wavelength Half Dipole Length Finite Separation Region Dipole Small Dipole mal Infinitesi on Introducti 8 . 4 7 . 4 6 . 4 5 . 4 4 . 4 3 . 4 2 . 4 1 . 4 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Reflections Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Image Theory Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Vertical Polarization
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2 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Vertical Electric Dipole (VED) Fig. 4.12a Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Field Components at Point of Reflection Fig. 4.12b Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas h μ ο , ε ο h h Image σ = Actual Problem Equivalent Problem Actual and Equivalent Problems Observation Point Observation Point Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Electric Conductor Fig. 4.13a
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3 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Magnetic Conductor Fig. 4.13b Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Horizontal Monopole Above PEC Ground Plane Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas 1, 1 , o εμη , , oo o () 00 0 01 0 0100 0 0 1 1 1 1 Open Circu 1 it r r μμ μ εε ε ηη εε ε −− Γ= = = + ++ + + ± large r Γ Magnetic Conductor Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 4 Linear Wire Antennas Magnetic Conductor/ Metamaterials (Artificial Electromagnetic Materials) In recent years there has been increasing interest in artificial electromagnetic materials, such as photonic crystals, Electromagnetic Band Gap (EBG) structures (formerly referred to as Photonic Band Gap-PBG), and double negative (DNG) Materials ( ). All of these materials are usually referred to as metamaterials , and they are usually realized by periodic dielectric substrates and various metallization patterns.
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Chapt4b - EEE 443 Antennas for Wireless Communications by...

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