The document discusses antenna engineering and electromagnetic wave propagation, focusing on wave equations for electric and magnetic fields. It includes topics such as wavefront propagation, wave impedance, reflection and transmission coefficients, and various polarizations. Additionally, it explores transmission line theory and the comparison between distributed and lumped elements.

1. Antenna Engineering CHO, Yong Heui Electromagnetic Wave

2. 1. Wave equation E and H wave equation  : E wave equation : H wave equation Proof: Faraday’s law + curl operator Sourceless system

3. Wave propagation  Propagation direction: z-direction : simplified wave equation Cartesian coordinate system 1. Wave equation

4. Wave propagation  Assumption: Propagation: constant wavefront 1. Wave equation

5. Wave velocity  Substitution: Wave velocity: Uniqueness theorem 1. Wave equation

6. Why’s EM wave propagate?  Movement, variance Importance of two curl equations 1. Wave equation

7. Complex number: time  Circuit theory EM theory 1. Wave equation

8. 2. Plane wave EM power  Poynting vector EM power Example of plane wave: Approximation ( 근사 )

9. Wave impedance  Ratio of E and H Resistance 2. Plane wave

10. Reflection and transmission  Incident wave Reflected wave Transmitted wave 2. Plane wave

11. Boundary conditions  E continuity at z = 0 H continuity at z = 0 Reflection and transmission coefficient 2. Plane wave

12. Transparency ( 투명 )  No reflection: transparency Total reflection : PEC (Electric Conductor) : PMC (Magnetic Conductor) 2. Plane wave

13. Lossy media  Ohm’s law: induced current density Complex permittivity Stealth 2. Plane wave

14. Skin depth  Conductor Skin depth: Wavenumber: Water 2. Plane wave

15. Polarization: direction of E field 2. Plane wave  LP: Linear Polarization, co and cross CP: Circular Polarization, AR (Axial Ratio) EP: Elliptic Polarization Vertical LP Horizontal LP

16. Wave propagation  3. Tx Line Theory

17. Distributed element  Lumped element: R, L, C  Distributed element: tx line 3. Tx Line Theory

18. Transmission line equation   Tx line Tx line modeling 3. Tx Line Theory

19. Wave solution  Traveling wave solution Voltage: Current: 3. Tx Line Theory

20. Characteristic impedance  Important parameter in tx line: 3. Tx Line Theory

21. Reflection coefficient   Voltage wave continuity conditions Current wave continuity conditions 3. Tx Line Theory

22. Comparison with circuit theory 3. Tx Line Theory

23. Comparison with circuit theory 3. Tx Line Theory

24. Comparison with circuit theory 3. Tx Line Theory