Note for Microwave Engineering - ME By Tariq Zaman
- Microwave Engineering - ME
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MICROWAVE ENGINEERING
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COPYRIGHT IS NOT RESERVED BY AUTHORS. AUTHORS ARE NOT RESPONSIBLE FOR ANY LEGAL ISSUES ARISING OUT OF ANY COPYRIGHT DEMANDS AND/OR REPRINT ISSUES CONTAINED IN THIS MATERIALS. THIS IS NOT MEANT FOR ANY COMMERCIAL PURPOSE & ONLY MEANT FOR PERSONAL USE OF STUDENTS FOLLOWING SYLLABUS PRINTED NEXT PAGE. READERS ARE REQUESTED TO SEND ANY TYPING ERRORS CONTAINED, HEREIN.
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MICROWAVE ENGINEERING (3-1-0) Module-I (14 Hours) High Frequency Transmission line and Wave guides: The Lumped-Element Circuit model for a Transmission line. Wave propagation. The lossless line. Field Analysis of Co-ax Transmission Lines. R, L, C, G parameters of Co-axial & Two wire Transmission lines, Terminated lossless transmission line, Lowloss line, The Smith Chart. Solution of Transmission line problems using Smith chart. Single Stub and Double Stub matching. Waveguides: Rectangular waveguides, Field solution for TE and TM modes, Design of Rectangular waveguides to support Dominant TE only. Module-II (12 Hours) TEM mode in Co-ax line. Cylindrical waveguides- Dominant mode. Design of cylindrical waveguides to support dominant TE mode. Microwave Resonator: Rectangular waveguides Cavities, Resonant frequencies and of cavity supporting. Dominant mode only. Excitation of waveguides and resonators (in principle only). Waveguides Components: Power divider and Directional Couplers: Basic properties. The TJunction power divider, Waveguide-Directional Couplers. Fixed and Precision variable Attenuator, Isolator, Circulator (Principle of Operation only). Module-III (10 Hours) Microwave Sources: Reflex Klystron: Velocity Modulation, Power output and frequency versus Reflector voltage Electronic Admittance. MultiCavity Magnetron: Principle of operation, Rotating field, Π-mode of operation, Frequency of oscillation. The ordinary type (O-type) traveling wave tube- Construction features, principle of operation as an amplifier, Gunn oscillator (principle). Module-IV (6 Hours) Microwave Propagation: Line of sight propagation. Attenuation of microwaves by Atmospheric gases, water vapors & precipitates. Text Books: 1. Microwave Engineering by D.M.Pozor, 2nd Edition, John Willy & Sons. Selected portions from Chapters 2,3,4,6,7&9. 2. Principles of Microwave Engineering by Reich, Oudong and Others. 3. Microwave Devices and Circuits, 3rd Edition, Sammuel Y, Liao, Perason.
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Microwave The signal deals with very small wave wavelength is called microwave signal, this implies signal has: Wavelength (ƛ) =speed/frequency With due increase in frequency the wavelength decrease and vice versa; we can say that wavelength is inversely proportional to frequency. In communication system,it generally consist of three main components: Transmitter, Receiver and Channel. There are two type mediums: transmission line & waveguide. Transmission line used for small range frequencies. Waveguide used for large range frequencies. Transmission Line (TL) The wave is bounded at low frequency in transmission line and hence called low pass filter. Transmission line mainly supports electromagnetic field. Types of Transmission Line: Coaxial cable Parallel wire cable Microstrip line Lumped Element Circuit Model of Transmission Line A current carrying conductor produce a magnetic field i.e., inductance which opposes the flow of current hence resistance ‘R’ is in series with inductance ‘L’. Because of dielectric separation; there exist a capacitance and the loss in the dielectric medium give rise to conductance. R= Resistance of the conductor (Ω/m) L= Self Inductance of the conductor (µ/m) C= Capacitance across the conductor (F/m) G= Dielectric Loss between conductor (Ʊ/m)
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