[Japanese/English]

## Electromagnetic Theory

Takuichi Hirano, Japan

### 1. Polarization, standing wave, reflection and transmission

Polarization
Animation of polarization
Condition for a circularly polarized wave radiation by two linearly polarized waves (in Japanese)
Condition to realize a circularly polarized wave by two linearly polarized waves
Standing wave
Animation of standing wave
Reflectin and transmission
Reflection and transmission of a plane wave, reflection law (Fermart's principle), refraction law (Snell's law), Fresnel's reflection and transmission coefficients, etc.

### 2. Radiation from the source

Electric dipole
Animation of electric force lines of electric dipole
Small dipole antenna
Animation of electromagnetic field radiated from the small dipole
Half-wavelength dipole antenna
Animation of electromagnetic field radiated from the half-wavelength dipole antenna
(Method of Moments analysis)
1.5-wavelength antenna
Animation of electromagnetic field radiated from the 1.5-wavelength antenna
(Method of Moments analysis)
Radiation Pattern of a Dipole Antenna As a Function of Dipole Length
Current distribution is approximated by sine
Electrostatic field and electromagnetic field
Comparison between electrostatic field and electromagnetic field
Field Equivalence Theorem (in Japanese)
Field Equivalence Theorem

### 3. Diffraction

Diffraction by a half-infinite ground plane
Animation of diffraction by a half-infinite ground plane (FDTD analysis)
Diffraction by a slit
Animation of diffraction by a slit (FDTD analysis)
EM Scattering
Scattering by a PEC cylinder, dielectric cylinder, parabolic reflector and dielectric lens. (FDTD analysis)

### 4. Radiation from the small dipole (transient)

Radiation from the small dipole (transient)
Animation of radiation from the small dipole (transient) (FDTD analysis)

### 5. Modal Analysis

Modal Analysis
Modal Analysis for waveguides

### 6. Microwave Circuits

Transmission lines
Dielectric loss
Skin depth and surface impedance of a conductor
Scatterers in a waveguide and its equivalent electric circuit model
Mechanism of a choke and stub

### 7. Analysis Methods for Electromagnetics

Method of Moments (MoM), Moment Method
Spectral Domain Approach (SDA) (PDF)
Finite Element Method (FEM)
Finite Difference Time Domain (FDTD) Method

### 8. Antenna and Propagation

Gain of Aperture Antennas
Directivity and Half Power Beam Width (HPBW)
Far Field Condition of Antenna
Friis Transmission Equation