# UNIT III.docx - EC T55 TRANSMISSION LINES AND WAVEGUIDES...

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EC T55 - TRANSMISSION LINES AND WAVEGUIDES COURSE OBJECTIVE To introduce the various types of transmission lines and to discuss the losses associated. To give thorough understanding about impedance transformation and matching. To use the Smith chart in problem solving. UNIT- I Network Parameters: Open circuit impedance (Z) parameters - short circuit admittance (Y) parameters - transmission (ABCD) parameters and inverse transmission parameters - Hybrid (h) parameters and inverse hybrid parameters - Conversion between parameters –Design of K type and m-derived filters – Switched twin T network , attenuators and equalizers. UNIT- II Transmission Line Theory: Transmission line equation – Primary and secondary constants - Infinite line- attenuation and phase constants- skin effect- wavelength- velocity of propagation- group velocity. Waveform distortion- distortion less transmission line-telephone cable- inductance loading of telephone cables. Open and short circuit lines. UNIT-III Transmission Line at Radio Frequencies: Line with any termination- Input impedance, input impedance of a lossless line, Reflection coefficient- Standing wave ratio. Ultra high frequency lines- Characteristics impedance, SWR, Smith chart- applications of smith chart- Quarter wave transformer-Stub matching- Single and double. UNIT IV Guided Waves and Rectangular waveguides: Introduction - Waves between parallel planes - Transverse electric waves,Transverse magnetic waves, Transverse electromagnetic waves and their characteristics -Wave impedances. Rectangular waveguides - TE and TM waves in rectangular waveguide- Dominant mode - Impossibility of TEM waves in wave guides - Wave impedance and characteristic impedance - Excitation methods for various modes. UNIT V Circular Wave Guides: Introduction – TE and TM waves in circular waveguide- Wave impedance - Attenuation factor and Q of wave guides- Wave impedance- Excitation mode sin circular wave guides. Microwave resonators introduction – Coaxial resonator-Waveguide, rectangular and circular cavity resonator - Cavity excitation and tuning – Qfactor of micro wave cavities (Qualitative treatment only). Text Books: 1. John. D. Ryder, Network lines and fields , PHI Learning, Second Edition, 2005.
2. Edward C. Jordan and Keith G. Balaman, Electromagnetic waves and radiating sy stems , Second Edition, PHI Learning, 2007. 3. P. Dananjayan, Transmission Lines And Wave Guides Lakshmi Publications, Chennai, 2012 Reference Books: 1. M.E. Van Valkenburg, Network Analysis , PHI, Third Edition, 2008. 2. William H Hayt and Jr John A Buck, Engineering Electromagnetic s Tata Mc Graw-Hill Publishing Company Ltd, New Delhi, 2008 3. David K Cheng, Field and Wave Electromagnetic s , Pearson Education Inc, Delhi, 2004 4. John D Kraus and Daniel A Fleisch, Electromagnetics with Applicati ons , Mc Graw Hill Book Co, 2005 Web references: 1. T ra nsm i ss i on L ine Pa ra met e r C a lcul a tor 2. S P I CE S i mu l a t i on of T ra nsm i ss i on L ines
TRANSMISSION LINES AND WAVEGUIDS UNIT-III ------------------------------------------------------------------------------------------------------------------------ - Transmission Line at Radio Frequencies: Line with any termination- Input