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MICROWAVE THEORY and ANTENNAS (18TE62)

Tuesday, May 25, 2021

 
MICROWAVE THEORY and ANTENNAS

  • Course Code : 18TE62 
  • CIE Marks : 40
  • Lecture Hours/Week : 03 + 2 (Tutorial) 
  • SEE marks : 60
  • Total Number of Lecture Hours : 50 (10 Hrs / Module) 
  • Exam Hours : 03
  • CREDITS : 04

Course Learning Objectives: This course will enable students to:

  • Know the Principle of operation of Microwave Tubes.
  • Understand the Concept of S-Parameters and various Microwave passivecomponents.
  • Understand the Basic Parameters as applied to Antennas
  • Analyze Antennas and Arrays of Antennas.

Module 1

Microwave Tubes: Introduction, Reflex Klystron oscillator, Mechanism of os-cillations, modes of oscillations, Mode curve (Qualitative Analysis only). (Text-1: 9.1, 9.2.2)
Microwave Transmission Lines: Transmission line equations and solutions,Reflection Coefficient and Transmission Coefficient, Standing wave and Standing wave ratio, Smith chart, Single stub matching. (Text-2: 3.1, 3.2, 3.3, 3.5, 3.6,Except Double stub matching).

Module 2

Microwave Network theory: Symmetrical Z and Y-Parameters, for reciprocal Networks, S matrix representation of multi-port Networks. (Text-l: 6.1, 6.2, 6.3) Microwave Passive Devices: Coaxial connectors and adapters, Attenuators, Phase shifters, Waveguide Tees, Magic tees, Circulators (Four port) and isolators (Faraday rotation Isolator). (Text-l: 6.4.2, 6.4.14, 6.4.15, 6.4.16, Except Applications of Magic TEE, 6.4.17)Directional coupler: Two - hole Directional coupler, 8- Matrix of a DirectionalCoupler. (Text-2: 4.5, 4.5.1, 4.5.2)


Module 3

Strip Lines: Introduction, Micro Strip lines, Parallel strip lines, Coplanar strip lines, Shielded strip Lines. (Text-2: Chapter 11) Antenna Basics: Introduction, Basic Antenna Parameters, Patterns, Beam Area, Radiation Intensity, Beam Efficiency, Directivity and Gain, Antenna Apertures,7 7 7 Eifectiye Height, Bandwidth, Radio Communication LinkAntennaField Zones7 7 7 &P01arizati0n. (Text-3: 2.1- 2.11, 2.13, 2.13, 2.15).


Module 4

Point Sources and Arrays: Introduction, Point Sources, Power Patterns, Power Theorem, Radiation Intensity, Field Patterns, Phase Patterns, Arrays of Two Isotropic Point Sources, Pattern Multiplication, Linear Arrays of n Isotropic Point Sources of equal Amplitude and Spacing. (Text-3:, 5.1 — 5.10, 13) Electric Dipoles: Introduction, Short Electric Dipole, Fields of a Short Dipole (General and Far Field Analyses), Radiation Resistance of a Short Dipole, Thin Linear Antenna (Field Analyses), Radiation Resistances of Lambda/2 Antenna. (Text-3: 6.1-6.6).


Module 5

Loop and Horn Antenna: Introduction, Small loop, Comparison of Far fields of Small Loop and Short Dipole, The Loop Antenna General Case, Far field Patterns of Circular Loop Antenna with Uniform Current , Radiation Resistance of Loops, DirectiVity of Circular Loop Antennas with Uniform Current, Horn antennas Rectangular Horn Antennas. (Text-3: 7.1-7.8, 7.19, 7.20). Antenna Types: Helical Antenna, Helical Geometry, Practical Design Considerations of Helical Antenna, Yagi-Uda array, Parabola General Properties, Log Periodic Antenna. (Text-3: 8.3, 8.5, 8.8, 9.5, 11.7).


Course Outcomes: After studying this course, students will be able to:

1. Describe the characteristic features of Microwave Tubes and the basic parameters of Antennas.
2. Represent the Multiport Network in terms of S-Parameters and ana- lyze their properties.
3. Understand the design concept of Strip lines and Micro strips.
4. Analyze the features of Antennas & Antenna Arrays.
5. Recommend suitable Antennas for various applications.


Question paper pattern:

  • Examination will be conducted for 100 marks with question paper containing 10 full questions, each of 20 marks.
  • Each full question can have a maximum of 4 sub questions.
  • There will be 2 full questions from each module covering all the topics of the module.
  • Students will have toanswerj fullquestions, selectingnnejallguestiom from each module.
  • The total marks will be proportionally reduced to 60 marks as SEE marks is 60.

Text Books:

1. Microwave Engineering — Annapurna Das, Sisir K Das, TMH Publication, 2nd Ed., 2010
2. Microwave Devices and Circuits- Liao/ Pearson Education
3. Antennas and Wave Propagation - John D. Krauss, Ronald J Marhefl<a and Ahmad S Khan, 4th Special Indian Edition , McGraW- Hill Education Pvt. Ltd., 2010


Reference Books:

1 . Microwave Engineering— David M Pozar, John Wiley India Pvt. Ltd., 3rd Edn, 2008
2. Microwave Engineering — Sushrut Das, Oxford Higher Education, 211d Edn, 2015
3. Antennas and Wave Propagation — Harish and Sachidananda: Oxford Univer-sity Press, 2007.