Chapt2a

Chapt2a - EEE 443 Antennas for Wireless Communications by...

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1 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters EEE 443 Antennas for Wireless Communications by Constantine A. Balanis Lecture #3 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Chapter 2 Fundamental Parameters Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters 2 Fundamental Parameters of Antennas Chapter 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Introduction Radiation Pattern Radiation Power Density Radiation Intensity Beamwidth Directivity Numerical Techniques Antenna Efficiency Gain Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters 2 ( ' ) Fundamental Parameters of Antennas Chapter cont d 2.10 2.11 2.12 2.13 Im 2.14 2.15 2.16 Beam Efficiency Bandwidth Polarization Input pedance Antenna Radiation Efficiency Antenna Vector Effective Length and Equivalent Areas Maximum Directivity and Ma 2.17 2.18 ximum Effective Area Friis Transmission Equation and Radar Range Equation Antenna Temperature Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Coordinate System Fig. 2.1 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters
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2 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters 2 2 00 2 4 sin r d d r π φ θ ππ = ∫∫ 2 0 0 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters 0 sin 0 2 0 2 = d d r 0 2 0 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters A mathematical and/or graphical representation of the radiation properties of an antenna, such as the: • amplitude • phase • polarization, etc. as a function of the angular space coordinates θ, φ. Radiation Pattern Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Coordinate System Fig. 2.1 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters • Field Pattern: A plot of the field (either electric | E | or magnetic | H |) on a linear scale • Power Pattern: A plot of the power (proportional to either the electric | E | 2 or magnetic | H | 2 fields) on a linear or decibel (dB) scale. Amplitude Radiation Pattern Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters
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3 Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Linear Scale N = 10 elements d = λ /4 spacing HPBW = 38.64 o 2-D Normalized Field | E n | Pattern of a Linear Array HPBW 0.707 0.707 2 || r E Fig. 2.2(a) Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters 2-D Normalized Power | E n | 2 Pattern of a Linear Array Linear Scale N = 10 elements d = λ /4 spacing HPBW = 38.64 o HPBW 0.5 0.5 Fig. 2.2(b) Copyright © 2005 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters HPBW -3 dB dB dB Scale N = 10 element d = λ /4 spacing HPBW = 38.64
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Chapt2a - EEE 443 Antennas for Wireless Communications by...

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