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Advanced Antenna Theory
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Advanced Antenna Theory
by Dr. Amalendu Patnaik

In radio engineering, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electro...

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About This Course

In radio engineering, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electro...

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Course Curriculum
7 Sections
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Advanced Antenna Theory

Fundamental Concepts

43 Pages
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    Introduction :Types of Antennas

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    Radiation Mechanism: Poynting vector and steradian,Power Intensity

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    Antenna Parameters: Radiated power,Radiation pattern,Field regions

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    Antenna Parameters: Directivity, gain,Antenna Polarization

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    Antenna parameters: Axial Ratio,Reflection Coefficient,input impedance,VSWR,Return Loss

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    Antenna Parameters: Impedance bandwidth, Effective aperture; Communication link and Friis transmission equation

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    Radiation integrals and Auxiliary Potential Functions (Part-1)

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    Radiation integrals and Auxiliary Potential Functions (Part-2)

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Advanced Antenna Theory

Radiation from wires and loops

28 Pages
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    Introduction, Infinitesimal dipole

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    Infinitesimal dipole: Radiation zones, Total radiated power, Radiation resistance, Directivity, Effective area

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    Short dipole

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    Finite-length dipole

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    Finite-length dipole: Radiated power, Radiation resistance, Directivity, Effective area

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    Half-wave dipole and its properties

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    Loop antenna

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Advanced Antenna Theory

Aperture Antenna

16 Pages
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    Introduction, Field equivalence principle

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    Loves equivalence principle, Electrical and magnetic conductor equivalence principle

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    Computation of field quantities of aperture antenna

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    Relation between wire and aperture antennas, Horn antenna design principle

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Advanced Antenna Theory

Broadband Antennas

12 Pages
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    Introduction, Principle of frequency-independent antenna

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    Examples of frequency-independent antennas

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    Log-periodic antenna concept and examples

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Advanced Antenna Theory

Microstrip Antennas

27 Pages
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    Introduction, Advantages and disadvantages, Microstrip antenna configurations

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    Excitation techniques, Criteria for substrate selection, Radiation mechanism

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    Methods of analysis, Transmission line model: Part -1

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    Transmission line model: Part -2

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    Cavity model: Part-1

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    Cavity model: Part-2

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Advanced Antenna Theory

Antennas Arrays

39 Pages
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    Introduction, Two-element array

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    Example problems, Pattern multiplication concept

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    N-element array, Uniform array , Array factor

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    Broad-side and end-fire arrays, Phased array

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    Directivity and pattern characteristic of linear uniform array

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    Non-uniform array, Binomial array

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    Dolph-Chebyshev array concept

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    Design principle of Chebyshev array and examples

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    Planar arrays

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Advanced Antenna Theory

Basic concepts of smart Antennas

22 Pages
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    Introduction, Need of smart antenna system, Overview of smart antenna system

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    Types of smart antennas, Switched beam system, Adaptive system

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    Beam forming, Fixed weight beam forming: Maximum signal-to-interference ratio beam-former

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    Minimum mean square error

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    Adaptive beam forming: LMS algorithm

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    Sample matrix inversion method

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