EC2353 ANTENNAS AND WAVE PROPAGATION lecture notes | for ECE - VII semester |
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UNIT I ELECTROMAGNETIC RADIATION AND ANTENNA FUNDAMENTALS
Review of electromagnetic theory: Vector potential, Solution of wave equation, retarded
case, Hertizian dipole. Antenna characteristics: Radiation pattern, Beam solid angle,
Directivity, Gain, Input impedance, Polarization, Bandwidth, Reciprocity, Equivalence of
Radiation patterns, Equivalence of Impedances, Effective aperture, Vector effective
length, Antenna temperature.
UNIT II WIRE ANTENNAS AND ANTENNA ARRAYS
Wire antennas: Short dipole, Radiation resistance and Directivity, Half wave Dipole,
Monopole, Small loop antennas. Antenna Arrays: Linear Array and Pattern Multiplication,
Two-element Array, Uniform Array, Polynomial representation, Array with non-uniform
UNIT III APERTURE ANTENNAS
Aperture Antennas: Magnetic Current and its fields, Uniqueness theorem, Field
equivalence principle, Duality principle, Method of Images, Pattern properties, Slot
antenna, Horn Antenna, Pyramidal Horn Antenna, Reflector Antenna-Flat reflector,
Corner Reflector, Common curved reflector shapes, Lens Antenna.
UNIT IV SPECIAL ANTENNAS AND ANTENNA MEASUREMENTS
Special Antennas: Long wire, V and Rhombic Antenna, Yagi-Uda Antenna, Turnstile
Antenna, Helical Antenna- Axial mode helix, Normal mode helix, Biconical Antenna, Log
periodic Dipole Array, Spiral Antenna, Microstrip Patch Antennas.
Antenna Measurements: Radiation Pattern measurement, Gain and Directivity
Measurements, Anechoic Chamber measurement.
UNIT V RADIO WAVE PROPAGATION
Calculation of Great Circle Distance between any two points on earth, Ground Wave
Propagation, Free-space Propagation, Ground Reflection, Surface waves, Diffraction,
Wave propagation in complex Environments, Tropospheric Propagation, Tropospheric
Scatter. Ionospheric propagation: Structure of ionosphere, Sky waves, skip distance,
Virtual height, Critical frequency, MUF, Electrical properties of ionosphere, Effects of
earth's magnetic fields, Faraday rotation, Whistlers.