Lecture VIII Antennas & Propagation -1- Antennas & Propagation Mischa Dohler King’s College London...
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Transcript of Lecture VIII Antennas & Propagation -1- Antennas & Propagation Mischa Dohler King’s College London...
![Page 1: Lecture VIII Antennas & Propagation -1- Antennas & Propagation Mischa Dohler King’s College London Centre for Telecommunications Research.](https://reader035.fdocuments.in/reader035/viewer/2022062309/5697c0121a28abf838ccbee7/html5/thumbnails/1.jpg)
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Antennas
&
Propagation
Mischa DohlerMischa Dohler
King’s College LondonKing’s College London
Centre for Telecommunications ResearchCentre for Telecommunications Research
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Books for Propagation
- Simon Saunders Simon Saunders “Antennas & Propagation”“Antennas & Propagation”
- William Jakes William Jakes “Microwave Mobile “Microwave Mobile
Communications”Communications”
- Kaveh Pahlavan Kaveh Pahlavan “Wireless Information “Wireless Information
Networks”Networks”
- try to omit articles and books from: try to omit articles and books from:
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Overview of Lecture VIII
- ScenariosScenarios
- Propagation MechanismsPropagation Mechanisms
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Satellite
Mega Cells
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Outdoor-Outdoor
Macro, Micro and Umbrella Cells
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Outdoor-Indoor
Macro and Micro Cells
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Indoor-Indoor
Micro and Pico Cells
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Losses and Deterioration
Propagation Mechanisms:
(1) Free Space Propagation
(2) Reflection and Transmission
(3) Scattering
(4) Diffraction
Distortions:
(5) Multipath Propagation
(6) Doppler Effect
Propagation Conditions:
(a) Line of Sight (LOS)
(b) non Line of Sight (nLOS)
(c) obstructed Line of Sight (oLOS)
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Free Space Propagation
Frii’s Transmission Formula:
Variations with Distance d:
The dB mysticism:
‘Loss’ Myth:
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Reflection and Transmission
TE and TM waves
Snell’s Law:
Fresnel Coefficients:
‘Object Size’ Myth:
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Reflection and Transmission
Reflection: TE and TM waves
Transmission: TE and TM waves
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Reflection and Transmission
Circular Elliptical After Reflection or
Transmission of non-linear
polarisation we always
obtain elliptical
polarisation.
Elliptical Elliptical
Linear Linear
i < Brewster i > Brewster
Left Right
Right Left
Left Left
Right Right
Change of Polarisation
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Scattering
Smooth Rough Rougher
Fraunhofer Criterion for
smooth surfaces
Rayleigh Criterion for
smooth surfaces
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Scattering
Correlation Function
Correlation Length
Correlation Height
Roughness Factor
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Diffraction
Huygen's Principle
‘Sharp Edges’ Myth
Consequences of Diffraction
Field-Strength in
shadowed areas
Rapid Field-strength
fluctuations
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Diffraction
Optical and Shadow Region
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Diffraction
Diffraction Coefficient
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Diffraction
Diffraction Coefficient
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Diffraction
Diffraction Coefficient