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Note for Microwave Engineering - ME By Tariq Zaman

  • Microwave Engineering - ME
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Tariq Zaman
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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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