17TE63 - MICROWAVE THEORY and ANTENNAS

Course objectives: 

This course will enable students to:

·Know the Principle of operation of Microwave Tubes.

· Understand the Concept of S-Parameters and various Microwave passive components.

· Understand the Basic Parameters as applied to Antennas

· Analyze Antennas and Arrays of Antennas. 

Module-1

Microwave Tubes: Introduction, Reflex Klystron Oscillator, Mechanism of Oscillations, 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: 0.1, 0.2, 0.3, 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 1: 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-1: 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, S- Matrix of a Directional

Coupler. (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, Effective Height, Bandwidth, Radio Communication Link, Antenna Field Zones & Polarization. (Text 3: 2.1- 2.11, 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 – 5.10,5.13)

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:

At the end of the course, students will be able to:

· Describe the characteristic features of Microwave Tubes.

· Represent the Multiport Network in terms of S-Parameters and analyze

their properties.

· Understand the design concept of Strip lines and Micro strips.

· Explain the basic parameters of Antennas

· Analyze the features of Antennas & Antenna Arrays.

· Recommend suitable Antennas for various applications.

Text Books:

1. Microwave Engineering – Annapurna Das, Sisir K Das TMH Publication, 2nd, 2010.

2. Microwave Devices and circuits- Liao, Pearson Education.

3. Antennas and Wave Propagation, John D. Krauss, Ronald J Marhefka 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, 2nd Edn, 2015.

3. Antennas and Wave Propagation – Harish and Sachidananda: Oxford University Press, 2007.

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 Notes, Assignment, Solution, Question Bank