## Course Title : Radio Engineering

Code 61090 3rd year 2nd term 2 No Restriction Lecture Toru Sato and Naoki Shinohara

### Course Description

In this class we study basics of the radio wave and antennas. We first examine the nature of the electromagnetic wave based on the wave equation derived from the Maxwell's equations. We discuss the relation between the source current distribution and the radiated wave field in terms of various antenna parameters. We further study the wave propagation, such as refraction, reflection, scattering, and diffraction. We also derive the basics of guided wave transmission from the boundary conditions of the Maxwell's equations.

Grading is based on the regular examination, but the rating of reports may be considered as well.

### Course Goals

Understand the basic theory of the radio wave, and technology for its industrial applications.

### Course Topics

Theme Class number of times Description
Nature of the radio wave 2〜3 We solve the Maxwell's equation in its simplest form to show that it gives the electromagnetic wave propagating in space. Basic nature of planar wave is examined including its reflection, transmission, velocity and polarization.
Radiation and basics of antennas 4〜5 We derive the radiation field from the Maxwell's equation with sources, and study its characteristics in the near and far fields. We examine the radiation from short dipole and linear antennas in terms of important parameters such as the gain, impedance, frequency characteristics, and effective area. We also study principle, structure, and basic analysis methods of various realistic antennas such as array and aperture antennas.
Radio wave propagation 2〜3 We study basic issues related to various types of the radio wave propagation including the ground wave, tropospheric and ionospheric propagation, and space communication. We also discuss diffraction and scattering of the radio waves.
Guided wave transmission 4〜5 We first study basic ideas related to the guided wave transmission, such as the transmission line theory and the Smith chart. We then study individual elements including coaxial line, microstrip line, rectangular waveguide, and circular waveguide, mainly focusing on their propagation modes, transmission characteristics, and loss.

### Textbook

Hasebe, 'Denpa kogaku (radio engineering),' 2nd Ed., Corona publishing, 2005 .

### Textbook(supplemental)

Balanis, 'Antenna theory,' 2nd Ed., Wiley, 1997.

### Prerequisite(s)

Knowledge of Electromagnetic theory 2 is required. Modulation Theory in Electrical Communication is recommended.