7EC1-ANTENNA & WAVE PROPAGATION |
Units: I-ANTENNA FUNDAMENTALS |
Antenna parameters, Radiation from a current element in free
space. Quarter & half wave antenna. Reciprocity theorem. Resonant and non-resonant antenna. Effective
length and aperature, gain, beamwidth, directivity, radiation resistance, efficiency, polarization,
impedance and directional characteristics of antenna, antenna temperature.
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Units: II-ANTENNAS |
V and Rhombic antennas, Folded dipole, Yagi-Uda antenna, Frequency
independent antennas, Log-periodic antennas,UHF and Microwave antennas- Antenna with parabolic
reflectors, Horn and Lens antennas, Helical antennas, Square and Circular loop antennas, Fundamentals
of Slot and Microstrip antennas. |
Units: III-ANTENNA ARRAYS |
Two element array, N-element linear arrays, Broadside, End fire,
collinear and combination arrays, Multiplication of patterns, Binomial arrays. Effect of ground on
antennas, Antenna loading
Antenna Measurements - Antenna impedance, radiation pattern, gain, directivity, polarization and phase
measurements
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Units: IV-RADIO WAVE PROPAGATION |
Mechanism of radio wave propagation, Reflection, Refraction
interference and diffraction of radio waves. Theory of ground wave, space wave and sky wave
propagation. Plane earth reflection, Reflection factors for horizontal and vertical polarizations. Duct
propagation and tropospheric scattering.
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Units: V |
Various Ionospheric layers. Characteristics of ionosphere and its effects on wave propagation.
Critical frequency, Virtual height, skipzone & maximum usable frequency. Multiple hop transmission.
Oblique & vertical incidence transmission. Effect of earth's magnetic field, solar activity and
meteorological conditions on wave propagation.
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