Chapt2c

Chapt2c - EEE 443 Antennas for Wireless Communications by...

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1 Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters EEE 443 Antennas for Wireless Communications by Constantine A. Balanis Lecture #8 Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Chapter 2 Fundamental Parameters Copyright © 2007 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 © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters 2 ( ' ) Fundamental Parameters of Antennas Chapter cont d e Temperatur Antenna Equation Range Radar and Equation on Transmissi Friis Area Effective Maximum and y Directivit Maximum Areas Equivalent and Length Effective Vector Antenna Efficiency Radiation Antenna Impedance Input on Polarizati Bandwidth Efficiency Beam 18 . 2 17 . 2 16 . 2 15 . 2 14 . 2 13 . 2 12 . 2 11 . 2 10 . 2 Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters () 2 * * * 1 ElectroM agnetic Fie (compl lds: Power Density 1 a. ( / (real) Re ) 2 1 b. ex) (imaginary/reactiv ) Im 2 2 e W W EH E H m H WE W Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters * * * 1 (comp Circuits: Po 1 a. (real) Re 2 le 1 b. (imaginary/react wer ( ) ive) I ) m 2 x 2 PV W I P I VI atts = = =
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2 Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Vector Effective Length ) , ( φ θ e A Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters Polarization Efficiency (Polarization mismatch or loss factor) e A e p = 2 2 2 e A i E i E efficiency on polarizati = e p length effective vector = e A field electric incident = i E (2-71a) Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters oc V A (,) e θφ ±²³²´ A i E Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters oc V = i E ) , ( e A ve wa incident by terminals antenna at generated ltage circuit vo - open = oc V field electric incident = i E length effective vector = e A Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters ˆˆ e aa θθ φφ φθ =+ AAA 4 4 a j k r in jkr in kI Ea E j e r Ie j r η π ωµ ⎛⎞ =+= ⎜⎟ ⎝⎠ =− e A e A Vector Effective Length (Height) is an equivalent length (height) for an antenna; aperture or linear element . Analogous to effective aperture . Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2 Fundamental Parameters I o I /2 A A () max ˆ s i n ˆ s i n 90 which is 100% of phys (4 2 ical length sin 4 ˆ (4 2 6 (s i n ) ) 4 6) e jkr j o e e o o kr a a a whe kI n a E a j e r ja r = = == A A µ A ¶²· ²¸ AA A z Impinging Wave Infinitesimal Dipole ( ) /50 λ A
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3 Copyright © 2007 by Constantine A. Balanis All rights reserved Chapter 2
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This note was uploaded on 11/01/2009 for the course EEE 443 taught by Professor Balanis during the Spring '08 term at ASU.

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Chapt2c - EEE 443 Antennas for Wireless Communications by...

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