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The unit extends the physics of electrical phenomena when wavelength is small relative to system physical dimensions. The unit introduces an analysis and design, as well as phenomena encountered when wavelength is short relative to the physical dimensions of an electrical system. The student will study signal and current wave propagation along conductors in electrical structures. This study will lead into an introduction to transmission line theory, dealing with the distributed nature of circuits and systems when propagation delays are significant. Concepts such as reflection coefficients, impedance transformation and Smith charts are studied. Based on transmission line theory, multiport networks are introduced and studied. This includes S-parameters, Z-parameters and signal flow graphs, which makes the analysis and design of networks possible. The modelling of active high frequency components are also considered, including diodes, junction transistors and field effect transistors. Matching networks are studied (to enable maximum power transfer and reduce standing wave ratios). This includes discrete component matching networks (T and PI networks) and microstrip line matching networks. Finally high frequency transistor amplifiers are studied, which include high frequency biasing, stability, gain, noise figure and multistage amplifiers. Students are assumed to have basic knowledge of electronic and electrical components such as transformers and other passive components.

Summary 2021

Unit name High Frequency Electronics and Circuits
Unit code ENG748
Credit points 12.5
Faculty/School College of Sciences and Engineering
School of Engineering
Discipline Engineering

JC Olivier

Available as student elective? No
Breadth Unit? No



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Learning Outcomes


Analyse high-frequency propagation, standing wave ratios, distributed impedance and reflections using transmission line theory and Smith charts.


Analyse electrical structures where active components require high-frequency modelling, and propagation delays are not insignificant


Design high frequency multiport circuits using S and Z parameters, as well as signal flow graphs.


Design high-frequency multistage amplifiers, including the case where the amplifiers require impedance matching networks.


Investigate impacts on transmission line performance due to small changes in the structure of high frequency circuits




ENG231 Electrical Machines and Transformers

ENG750 Signals and Linear Systems

ENG722 Control Systems 1


Teaching Pattern



AT1 - Assignment 1 (45%)

AT2 - High-frequency circuit board laboratory (10%)

AT3 - Design and analyse a high frequency amplifier (45%)

TimetableView the lecture timetable | View the full unit timetable



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