A Course Material on Transmission Lines and Waveguides

1 A Course Material on Transmission Lines and Waveguides By Mr. ASSISTANT PROFESSOR DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING SASURIE COLLEGE OF ENGINEERING VIJAYAMANGALAM 638 056 QUALITY CERTIFICATE This is to certify that the e- Course Material Subject Code : EC6305 Subject : Transmission Lines and Waveguides Class : III Year ECE Being prepared by me and it meets the knowledge requirement of the university curriculum. Signature of the Author Name : Mr.

2 Designation: Assistant Professor This is to certify that the Course Material being prepared by Mr. is of adequate quality. He has referred more than five books among them minimum one is from abroad author. Signature of HD Name: Dr. SEAL EC6503 Transmission Lines AND Waveguides SCE Dept. of ECE CONTENTS PAGE NO UNIT I Transmission LINE THEORY General theory of Transmission Lines 01 The Transmission line, general solution & the infinite line.

3 03 Wavelength, velocity of propagation. 08 Waveform distortion 09 The distortion less line 11 Loading and different methods of loading 13 Line not terminated in Zo 14 Reflection coefficient 15 Calculation of current, voltage, power delivered and efficiency of Transmission 17 Input and transfer impedance 19 Open and Short circuited Lines 20 Reflection factor and reflection loss 21 UNIT II HIGH FREQUENCY Transmission Lines Transmission line equations a radio frequencies 22 Line of zero dissipation.

4 Voltage and current on the dissipation 29 Less line, standing waves, nodes, standing wave ratio 30 Input impedance of the dissipation less line & Open and short circuited Lines . 31 EC6503 Transmission Lines AND Waveguides SCE Dept. of ECE Power and impedance measurement on Lines 32 Reflection losses 34 Measurement of VSWR and wavelength 36 UNIT III IMPEDANCE MATCHING IN HIGH FREQUENCY Lines Impedance matching: Quarter wave transformer 39 Impedance matching by stubs, Single stub and double stub matching.

5 41 Smith chart, Solutions of problems using Smith chart 44 Single and double stub matching using Smith chart. 54 UNIT IV PASSIVE FILTERS Filter fundamentals, Design of filters, 55 Characteristics impedance of symmetrical networks, Constant K, Low pass, High pass, Band pass. 60 Band Elimination, m-derived sections 67 Low pass, high pass composite filters. 72 UNIT - V Waveguides AND CAVITY RESONATORS. General Wave behaviors along uniform, Guiding structures 73 Transverse Electromagnetic waves, Transverse Magnetic waves, Transverse Electric waves, 76 TM and TE wave between parallel plates, 88 TM and TE waves in Rectangular wave guides 90 EC6503 Transmission Lines AND Waveguides SCE Dept.

6 Of ECE Bessel s differential equation and Bessel function, TM and TE waves in Circular wave guides 96 Rectangular and circular cavity resonators. 100 APPENDICES A Question Bank. 105 B University Question Papers 124 EC6503 Transmission Lines AND Waveguides SCE Dept. of ECE EC6503 - Transmission Lines AND Waveguides OBJECTIVES: To introduce the various types of Transmission Lines and to discuss the losses associated.

7 To give through understanding about impedance transformation and matching. To use the Smith chart in problem solving. To impart knowledge on filter theories and wave guides theories. UNIT I Transmission LINE THEORY 9 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 Zo Reflection coefficient calculation of current, voltage.

8 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 9 Transmission line equations a 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.

9 UNIT III IMPEDANCE MATCHING IN HIGH FREQUENCY Lines 9 Impedance matching: Quarter wave transformer Impedance matching by stubs Single stub and double stub matching Smith chart Solutions of problems using Smith chart Single and double stub matching using Smith chart. UNIT IV PASSIVE FILTERS 9 Characteristics impedance of symmetrical networks filter fundamentals, Design of filters, constant K, Low pass, High pass, Band pass, Band Elimination, m-derived sections low pass, high pass composite filters.

10 UNIT - V Waveguides AND CAVITY RESONATORS. 9 General Wave behaviours along uniform, Guiding structures, transverse Electromagnetic waves, Transverse Magnetic waves, Transverse Electric waves, TM and TE wave between parallel plates, TM and TE waves in Rectangular wave guides, Bessel s differential equation and Bessel function, TM and TE waves in Circular wave guides, Rectangular and circular cavity resonators. EC6503 Transmission Lines AND Waveguides SCE Dept.