Course detail

# HF techniques and antennas

FEKT-BVSTAcad. year: 2017/2018

The course is focused on clarification of basic principles in the area of high frequency circuits and antennas. In the introduction, high frequency properties of basic circuit elements are defined. The following part is oriented towards description and design of basic functional blocks of high frequency communication systems (amplifiers, mixers, modulators, demodulators, oscillators). The next part solves propagation of electromagnetic waves in the free space and along transmission lines, describes different principles and effects influencing propagation. The following part discusses energy radiation to space, describes basic types of antennas and their parameters. The last part is devoted to the introduction to microwave circuits.

Supervisor

Department

Learning outcomes of the course unit

The graduate is able to:

- describe parameters of a capacitor and an inductor in the high frequency circuit

- explain a function of serial and parallel resonance circuits

- work with Smith diagram

- explain a function of individual high frequency blocks (amplifier, mixer, modulator, demodulator, oscillator)

- define parameters of a high frequency amplifier for low level signals

- design a linear high frequency amplifier according to given parameters

- estimate parameters of a high frequency power amplifier via calculations

- draw and describe basic schematics of feedback LC oscillators

- draw and describe principles of PLL synthesizers

- explain principles of electromagnetic waves propagation

- describe a function and parameters of a dipole antenna and to draw its radiation patterns

- define and calculate a gain of a given antenna

Prerequisites

The student should be able to explain basic terms from the area of electrical circuits, electromagnetic waves and transmission lines (inductance, capacity, impedance, reflection coefficient, standing wave ratio), solve simple electronic circuits with passive components and calculate with complex numbers and logarithms.

Co-requisites

Not applicable.

Recommended optional programme components

Not applicable.

Recommended or required reading

RAIDA, Z., HANUS, S. Vysokofrekvenční technika a antény. Edice "Elektronická skripta". Brno: FEKT VUT v Brně, 2002. (CS)

VÁGNER, P. Vysokofrekvenční technika. Skripta FEKT VUT, 2013. (CS)

GUPTA, K. C., GARG, R., BAHL, I., BHARTIA, P. Microstrip lines and slotlines. 2nd ed. Boston: Artech House 1996, ISBN: 0-89006-766-X. (EN)

JORDAN, E. C., BALMAIN, K. G. Electromagnetic waves and radiating systems. 2nd ed. New York: Prentice Hall, 1950. ISBN 01-324-9995-9. (EN)

WHITE, J. F. High frequency techniques. Hoboken: John Wiley & Sons, 2004. ISBN: 0-471-45591-1. (EN)

Planned learning activities and teaching methods

Teaching methods include lectures, computer laboratories and practical laboratories. Course is taking advantage of e-learning (Moodle) system. Students in computer classes solve individually assigned problems.

Assesment methods and criteria linked to learning outcomes

During the semester, students can obtain 32 points, from which 20 points are for labs and 12 points are for tasks successfully solved in computer labs. A final written exam consists of theoretical and numerical parts and is evaluated by 68 points. Students have to reach at least half of the full rating of each part to successfully pass the final exam.

Language of instruction

Czech

Work placements

Not applicable.

Course curriculum

1. Basic high frequency components and circuits

2. High frequency amplifiers

3. Design of a small-signal linear high frequency amplifier

4. Mixers

5. Modulators, demodulators

6. Signal generators – oscillators

7. Signal generators – synthesizers

8. Electromagnetic field theory

9. Electromagnetic waves propagation

10. Antennas

11. Antenna parameters

12. Transmission lines

13. Microwave circuits

Aims

The aim of the course is to familiarize students with basics of high frequency circuits and their applications in communication systems, to explain theory of electromagnetic waves propagation and to describe antenna issues in theoretical and practical ways.

Specification of controlled education, way of implementation and compensation for absences

Evaluation of activities is specified by a regulation, which is issued by the lecturer responsible for the course annually.

#### Type of course unit

eLearning

**eLearning:** currently opened course