Introduction Syllabus Methods of Evaluation Text Books & References Resources Introduction to Electromagnetism S. R. Zinka [email protected]School of Electronics Engineering Vellore Institute of Technology July 16, 2012 Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
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Introduction Syllabus Methods of Evaluation Text Books & References Resources
Most of theinfrared spectrumabsorbed byatmosphericgasses (bestobservedfrom space).
Radio waves observablefrom Earth.
Long-wavelengthradio wavesblocked.
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0.1 nm 1 nm 10 nm 100 nm 1 µm 10 µm 100 µm 1 mm 1 cm 10 cm 1 m 10 m 100 m 1 km
Wavelength
Atm
ospheric
opacity
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Founding Fathers
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
James Clerk Maxwell (1831-1879)'
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∇× E = − ∂B∂t
∇ ·D = ρe
∇×H = Je +∂D∂t
∇ · B = 0
“In 1865, Maxwell unified the twodistinct theories electricity andmagnetism into a single super-theory electromagnetism andproved that optics is a sub-field ofthis super-theory”
Most profound and the most fruitful that physics has experiencedsince the time of Newton - Albert Einstein
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Henrich Rudolf Hertz (1857-1894)
“In 1888, Hertz experimentallydemonstrated the existence of elec-tromagnetic waves”
It’s of no use whatsoever ... this is just an experiment that provesMaestro Maxwell was right ... we just have these mysterious elec-tromagnetic waves that we cannot see with the naked eye. But theyare there - Henrich Rudolf Hertz
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Jagadish Chandra Bose (1858-1937)
“In 1894, Bose ignited gunpowderand rang a bell at a distance us-ing electromagnetic waves provingthat communication signals can besent without using wires.”
The invisible light can easily pass through brick walls, buildingsetc. Therefore, messages can be transmitted by means of it withoutthe mediation of wires - J. C. Bose
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Guglielmo Marconi (1874-1937)
“made the first public transmission of wireless signals on 27 July1896”
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Guglielmo Marconi (1874-1937)
Marconi overseeing his assistants using a kite to raise the antenna
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Hendrick Antoon Lorentz & Albert Einstein
• Lorentz took theelectrodynamics theoryfurther into microscopic leveland laid foundation for thespecial theory of relativity(STR)
• Later in 1905, Einsteinformulated STR in its fullextent
For me personally Lorentz meant more than all the others I havemet on my life’s journey - Albert Einstein
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Paul Maurice Dirac
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∇× E = −Jm −∂B∂t
∇ ·D = ρe
∇×H = Je +∂D∂t
∇ · B = ρm
“expanded electrodynamics to amore symmetric form, includ-ing magnetic as well as electriccharges”
One could perhaps describe the situation by saying that God is amathematician of a very high order, and He used very advancedmathematics in constructing the universe - Paul Dirac
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Why Do We Need To Study this Course?
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Any pile of tin with a transmission line exciting it may be calledan antenna. It is evident on physical grounds that such a pile of tindoes not make a good antenna, and it is worthwhile to search forsome distinguishing characteristics that can be used to differentiatebetween an ordinary pile of tin and one that makes a good antennaa
aVolume 8 of the MIT Radiation Laboratory series, The Principles of Microwave Circuits
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
A Few Applications
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Wi-Fi Radio
Mobile Phone Microwave Oven
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Air Traffic Control (ATC)
Weather Forecasting
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Satellite Communication & Remote Sensing
Missile Surveillance & Tracking
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
A Few Microwave Components
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Coaxial Cable Rectangular Waveguide
Circular Waveguide Microstrip Line (Filter)
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Rect to Circular Transition Coaxial to Microstrip Transition
E Plane Tee H Plane Tee
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources
Magic Tee Waveguide Directional Coupler
Microstrip Filter Waveguide Filter
Introduction to Electromagnetism EE208, School of Electronics Engineering, VIT
Introduction Syllabus Methods of Evaluation Text Books & References Resources