Transmission Lines and RF Systems

EC3551

TRANSMISSION LINES AND RF SYSTEMS

COURSE OBJECTIVES:

i. To introduce the various types of transmission lines and its characteristics

ii. To understand high frequency line, power and impedance measurements

iii. To impart technical knowledge in impedance matching using Smith Chart.

iv. To introduce passive filters and basic knowledge of active RF components

v. To learn the concepts of a RF system transceiver design.

UNIT I

TRANSMISSION LINE THEORY

General theory of Transmission lines - the transmission line - general solution - The infinite line - Wavelength, velocity of propagation - Waveform distortion - the distortion less line - Loading and different methods of loading - Line not terminated in Z 0 - Reflection coefficient - calculation of current, voltage, power delivered and efficiency of transmission - Input and transfer impedance - Open and short circuited lines - reflection factor and reflection loss.

UNIT II

HIGH FREQUENCY TRANSMISSION LINES

Transmission line equations at radio frequencies - Line of Zero dissipation - Voltage and current on the dissipation less line, Standing Waves, Nodes, Standing Wave Ratio - Input impedance of the

dissipation less line - Open and short circuited lines - Power and impedance measurement on lines - Reflection losses - Measurement of VSWR and wavelength.

UNIT III

IMPEDANCE MATCHING IN HIGH FREQUENCY LINE

Impedance matching: Quarter wave transformer ,One Eighth wave line, Half wave line- Impedance matching by stubs- Single stub and double stub matching - Smith chart – Application of Smith chart, Solutions of problems using Smith chart - Single and double stub matching using Smith chart.

UNIT IV

WAVEGUIDES

Waves between parallel planes of perfect conductors- Transverse Electric waves and Transverse Magnetic waves, Characteristics of TE and TM waves, Transverse Electromagnetic waves, TM and TE waves in Rectangular waveguides, TM and TE waves in Circular waveguides.

UNIT V

RF SYSTEM DESIGN CONCEPTS

Active RF components: Semiconductor basics in RF, bipolar junction transistors, RF field effect transistors, High electron mobility transistors, Fundamentals of MMIC, Basic concepts of RF design: Filters, couplers, power dividers, Amplifier power relations, Low noise amplifiers, Power amplifiers.

COURSE OUTCOMES:

CO1: Explain the characteristics of transmission lines and its losses.

CO2: Calculate the standing wave ratio and input impedance in high frequency transmission lines.

CO3: Analyze impedance matching by stubs using Smith Charts.

CO4: Comprehend the characteristics of TE and TM waves.

CO5: Design a RF transceiver system for wireless communication

TOTAL:45 PERIODS

TEXTBOOKS

i. John D Ryder, “Networks lines and fields”,Prentice Hall of India,New Delhi,2005.(Unit I–IV)

ii. Mathew M. Radmanesh, “Radio Frequency &Microwave Electronics”, Pearson Education Asia, Second Edition, 2002 (Unit – V)

iii. Annapurna Das, Sisir K. Das, “Microwave Engineering”, McGraw Hill Education (India) private limited, Third edition,2000.(Unit – V)

REFERENCES

i. Reinhold Ludwig and Powel Bretchko, “RF Circuit Design” – Theory and Applications”, Pearson Education Asia, First Edition, 2001.

ii. D. K. Misra, “Radio Frequency and Microwave Communication Circuits”- Analysis and Design, John Wiley & Sons, 2004.

iii. Richard Chi-Hsi Li - , “RF Circuit Design” – A John Wiley & Sons, Inc, Publications

iv. W.Alan Davis, Krishna Agarwal, “Radio Frequency Circuit Design”, John willy & Sons,2001