Antenna and Propagation
Course Objectives:
To provide the student with an understanding of antennas, EM wave propagation and optical fibre communications.
- Radiation and Antenna Fundamentals(6 hours)
- Retarded Potentials: EM wave generation with a conduction current, the short uniform current dipole, the radiated electric and magnetic fields.
- Radiation patterns and input impedance of the short uniform current dipole, the short Dipole and long dipole.
- Antenna theorems: reciprocity, superposition, Thevenin, minimum power transfer, Compensation, equality of directional patterns, equivalence of receiving and Transmitting impedances.
- Antenna Parameters and Arrays:(6 hours)
- Basic antenna parameters
- Pattern multiplication: Linear and two-dimensional antenna arrays, end fire and Broadside arrays.
- Antennas classification:(10 hours)
- Isotropic antenna
- Omni directional antenna; Dipole
- Directional antennas;
- Travelling wave antennas – single wire, V and Rhombus Reflector antennas – large plane sheet, small plane sheet, linear, corner, parabolic, elliptical, hyperbolic and circular reflector. Aperture antenna - horn Array antennas – Yagi-Uda, Log Periodic Other antennas – Monopole, Loop, Helical, Microstrip.
- Propagation and Radio Frequency Spectrum(6 hours)
- Ground or surface wave
- Space wave; direct and ground reflected wave, duct propagation
- Ionospheric or sky wave; critical frequency, MUF, Skip distance
- Tropospheric wave
- Radio frequency spectrum and its propagation characteristics
- Propagation between Antennas:(6 hours)
- Free space propagation: power density of the receiving antenna, path loss
- Plane earth propagation: the ground reflection, effective antenna heights, the two ray
- propagation model, path loss
- Fresnel Zones and Knife edge diffraction
- Optical fibres (Introductory)(11 hours)
- Optical fibre communication system and its advantages and disadvantages over Metalled wire communication system
- Types of optical fibre and its structural difference
- Light propagation characteristics and Numerical Aperture (NA) in optical fibre
- Losses
- Light source and photo detector
Practical:
- Two Experiments in properties of EM waves: refraction, diffraction, polarization
- Two Experiments in radiation patters of various types of antennas
- Two Experiments in measurements on optical fibre transmission systems
References:
- J. D. Kraus, “Antenna” McGraw Hill
- C. A. Balanis, “ Antenna Theory Analysis and Design” John Wiley & Sons, Inc.
- Collins, R. E., “Antenna and Radio Wave Propagation” McGraw Hill.
- Gerd Kaiser “Optical Fibre Communications” McGraw Hill.
- John Gowar “ Optical Communication Systems” PHI Publications.
Evaluation Scheme:
Unit |
Hours |
Questions |
1 |
6 |
1.5 |
2 |
6 |
1.5 |
3 |
10 |
2.5 |
4 |
6 |
1.5 |
5 |
6 |
1.5 |
6 |
11 |
2.5 |
Total |
45 |
11 |
*Note: There may be minor deviation in marks distribution
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