Upgrade of the existing transmission line in P402

Supervisor : Andrew Chalmers

Development project 115.715

1

Outlines

①The objectives of the project②Design of the transmission line③Impedance matching system④Laboratory instruction ⑤The project management

2

Objectives

1

• To have a meaningful lab experiment on transmission line

2 • To redesign the existing transmission line

3 • To product the line impedance

4 • To design an impedance matching system

5• To design an instruction sheet

3

Introduction

Full diagram of the project

4

The design of the line

The aspect to look at:

The material of the conductor

The sending end boxThe receiving end The strength of the lineThe holders of the both ends

5

Line impedance

How to calculate the line impedance?Zo=(276/ε)*log(D/a)

1 2 3 4 5 6 7 8 9 100

100

200

300

400

500

600

700

D=60mmD=50mmD=40mmD=30mm

Diameter in (mm)

Imp

ed

an

ce (

oh

m)

6

Impedance matching system

The impedance matching system is called Balun transformer

490 ohms

7

The laboratory instruction

It consists ofThe full diagram of the projectThe description of the componentsThe set up of the generator The set up of the oscilloscope The measurement of the standing wave Compare the measured and the calculated standing

wave

8

The modification

The turnbackles

Receiving end

Matching system9

The involvements

Power

Electronics

Drawing Transformers

Radio frequency

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Time plan

design boxes8%

set up conduc-

tors2%

matching system

25%

testing10%modifing

16%

instruction sheet3%

final report25%

final presenta-tion10%

Second semester

research55%

proposal10%

presenta-tion2%

calculation9%

progress25%

First semester

11

Conclusion

12

The material of the line is steel The line impedance is 490 ohms Impedance matching is balun

transformer The instruction sheet

The end

Any questions?

13