FIELDS AND WAVES

Year	No.	Offer	Mode	Description			Cred. Pts
96	70625 	S2  	D 	FIELDS AND WAVES          	1.00

Contents

• Staffing
• Pre-requisite(s)
• Co-requisite(s)
• Synopsis
• Objectives
• Topics
• Texts
• Recommended References
• Student Workload
• Assessment Details
• Other Requirements

STAFFING:

PRE-REQUISITE(S)

75612+70320

CO-REQUISITE(S)

75613

SYNOPSIS:

It  is  a  common  requirement  of an electrical  engineer  to  convey
electrical  energy from one place to another, whether for the  purpose
of power or information transport.  A pair of conductors used for this
purpose  constitute  a  transmission line,  and  for  any  appreciable
distance a.c. voltages and currents on the line must be regarded as  a
travelling  wave - whether from a power station, in a radio  receiver,
or across a digital circuit board.

The  electric and magnetic fields associated with voltage and currents
may  be  similarly propagated as a travelling wave; such  fields  also
constitute the basis of electrical machines and are the cause of  much
unwanted interference.

Therefore,  an  understanding of both wave  propagation  and  electro-
magnetic   fields   is  essential  in  all  branches   of   electrical
engineering.

OBJECTIVES:

When a student has mastered this unit, he/she should be able to:

1. recognise the existence of transmission lines in any given electrical system and analysis using distribution circuit theory;
2. explain how voltage and current waves are propagated down transmission lines, both perfect (lossless) and imperfect.
3. recognise and state the properties of common types of transmission line;
4. calculate attenuation, phase velocity and phase delay on practical transmission lines;
5. explain signal distortion on transmission lines and how it may be compensated for;
6. perform basic standing wave measurements and calculations on a transmission line;
7. calculate reflection coefficients at a mismatch and perform single stub matching;
8. explain and analyse transient phenomena on transmission lines and the technique of Time Domain Reflectometry;
9. explain the basic properties of electric and magnetic fields, both static and time dependant, as described by Maxwell's Equations;
10. perform simple field calculations from Maxwell's Equations and solve simple two dimensional field problems by numerical modelling;
11. explain the interaction of electric and magnetic fields with materials and the phenomena of permittivity, permeability and magnetisation;
12. explain how the interaction of electric and magnetic fields can produce electromagnetic waves; and calculate the associated energy flow;
13. explain the propagation of electromagnetic waves in free space;
14. state the engineering uses of the major parts of the electromagnetic spectrum and relate the differing propagation phenomena to frequency;
15. define and explain the skin effect and contrast the propagation of electromagnetic waves within conducting media to those in non conducting media;
16. explain the propagation of electromagnetic energy down guided structures including waveguide and microstrip.

TOPICS:

 Description                                                    Weighting(%)

TRANSMISSION LINES                                                    40.00
Distributed circuit theory; travelling waves; characteristic
impedance; high frequency solutions; practical transmission
lines; attenuation, phase delay and phase velocity;
distortion and equalisation techniques.
Reflections and standing waves; stub lines; transmission
line measurements; impedance matching.
Pulse and step response of transmission lines; lattice
diagrams; initial and final responses; surge impedance;
practical applications; transmission line analysis of
printed circuit board tracks and logic circuits.

ELECTROMAGNETIC THEORY                                                30.00
Overview of electromagnetism; fields and the visualisation
of flux, div. and curl.
The Electrostatic Field; Coulomb's Law; electric flux
density and Gauss' Law; potential; Laplace's Equation and
two dimensional solution numerical methods; capacitance;
dielectric properties of
materials.
Current; resistivity and resistance of materials; the
Hall Effect; Lorentz's Law; cathode ray tube dynamics.
The Magnetostatic Field; forces; Ampere's Law; magnetic
flux density; magnetic properties of materials,
magnetisation and the B-H curve; Faraday's Law and
electromagnetic induction; inductance.
Maxwell's Equations and displacement current.

ELECTROMAGNETIC WAVES                                                 30.00
Deviation from Maxwell's Equations; velocity; impedance of
free surface; visualisation; energy density, power flow
and the Poynting Vector;
Introduction to the electromagnetic spectrum and the
variation of properties with frequency; engineering
utilisation of the spectrum; radiation and propagation.
Electromagnetic waves in conducting media; good conductors
and the skin effect; wave impedance.
Guided electromagnetic waves; boundary conditions;
waveguide propagation by superposition of reflected waves;
Waveguide modes; the Waveguide Equation; group and phase
velocities; guide wavelength; impedances; evanescent
waves; stripline, microstrip and quasi-TEM propagation.

TEXT and MATERIALS to be PURCHASED:

Krauss J D, Electromagnetics, McGraw Hill, International Student
Edition. (Also a text for 70725 Communication Systems and 70927 High
Frequency Engineering).

RECOMMENDED REFERENCE MATERIALS:

Parton J E, Owen S J T and Raven M S, Applied Electromagnetics,
Macmillan, 1986.

STUDENT WORKLOAD REQUIREMENTS:

	ACTIVITY				HOURS
Lectures                                      	40
Tutorials/Workshops                           	15
Laboratory or Practical Classes               	20
Report Writing                                	10
Directed Study                                	30
Private Study                                 	55
Examinations                                  	5

ASSESSMENT DETAILS:

No	*F/S	Marks		Due		Description					Wtg(%)		LBL
1 	S 	        	PASSIM  	TRANSMISSION LINE MEASUREMENTS          	10.00   	N
2 	S 	        	MID-SEM 	2 HOUR RESTRICTED EXAMINATION           	30.00   	N
3 	S 	        	WK 12   	FIELD ANALYSIS ASSIGNMENT               	10.00   	N
4 	S 	        	END S2  	3 HOUR CLOSED BOOK FINAL EXAMINATION    	50.00   	N

OTHER REQUIREMENTS:

1    Satisfactory  performance, normally 50%, must be demonstrated  in
     all four assessments of the unit.
2    Calculators and personal notes only are permitted in the mid unit
     examination.
3    Calculators are not permitted in the final examination.
4    Because  it is normal practice to release model answers  promptly
     after the due date, the penalty for late submission of assignment
     work will normally be the loss of all marks for the assignment.
5    It  is the policy of the Faculty of Engineering and Surveying NOT
     to  accept  submission  of assignments  by  facsimile  or  email.
     Students  in remote locations who do not have regular  access  to
     postal services may be given special consideration.