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2.1 - Department of Electrical and Computer Engineering...

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Department of Electrical and Computer Engineering ECSE 352 Electromagnetic Waves and Optics 2.1 EM Wave propagation in free space References: Section 12.1 2.1-1 Overview In this class we will investigate the way that electromagnetic waves arise from Maxwell's equations All waves require a source and we will see that when electric Maxwell s equations. All waves require a source and we will see that when electric and magnetic dipoles oscillate at high frequencies, waves are radiated. We will then follow the derivation of the source-free wave equations from Maxwell's equations. In many cases of practical interest, the frequency of a wave-source i d hi l d h f h i h h remains constant and this leads to the concept of harmonic waves that have a single well-defined frequency. This assumption greatly simplifies the mathematical treatment of EM waves and results in a time-independent formulation of the wave equations called the vector Helmholtz equation. We will investigate the concept of phasor representation of EM waves and will see that simple cosine functions are solutions of this equation. Finally we will examine the relationship between the electric and the magnetic fields. ©AGK 2005 ECSE 352 2.1-2 Concept Map ©AGK 2005 ECSE 352 2.1-3 Module 2: The Uniform Plane Wave Module 1: Transmission Lines Module 2: The Uniform Plane Wave 1 Wave propagation in free space 1. 2. Wave propagation in lossy media 3. Waves in conductors 4. Wave power and the Poynting vector 5. The skin effect 6 Wave polarization 6. Module 3: Waves at boundaries ©AGK 2005 ECSE 352 2.1-4 Module 4: Waveguides and antennas
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