Access AWP Important Questions Pdf Download with Syllabus 2024
Syllabus
UNIT I:
ANTENNA FUNDAMENTALS: Introduction, Radiation Mechanism – single wire, 2
wire, dipoles, Current Distribution on a thin wire antenna. Antenna Parameters – Radiation
Patterns, Patterns in Principal Planes, Main Lobe and Side Lobes, Beam widths,
Polarization, Beam Area, Radiation Intensity, Beam Efficiency, Directivity, Gain and
Resolution, Antenna Apertures, Aperture Efficiency, Effective Height, illustrated Problems.
UNIT II:
THIN LINEAR WIRE ANTENNAS: Retarded Potentials, Radiation from Small Electric
Dipole, Quarter wave Monopole and Half wave Dipole – Current Distributions, Evaluation
of Field Components, Power Radiated, Radiation Resistance, Beamwidths, Directivity,
Effective Area and Effective Height. Natural current distributions, fields and patterns of
Thin Linear Center-fed Antennas of different lengths, Radiation Resistance at a point which
is not current maximum, Antenna Theorems – Applicability and Proofs for equivalence of
directional characteristics, Loop Antennas: Small Loops – Field Components, Comparison
of far fields of small loop and short dipole, Concept of short magnetic dipole, D and Rr
relations for small loops.
UNIT III:
ANTENNA ARRAYS : 2 element arrays – different cases, Principle of Pattern
Multiplication, N element Uniform Linear Arrays – Broadside, End-fire Arrays, EFA with
Increased Directivity, Derivation of their characteristics and comparison; Concept of
Scanning Arrays. Directivity Relations (no derivations), Related Problems, Binomial
Arrays, Effects of Uniform and Non-uniform Amplitude Distributions, Design Relations,
Arrays with Parasitic Elements, Yagi-Uda Arrays, Folded Dipoles and their characteristics
UNIT IV:
NON-RESONANT RADIATORS : Introduction, Traveling wave radiators – basic
concepts, Long wire antennas –field strength calculations and patterns, Microstrip AntennasIntroduction, Features, Advantages and Limitations, Rectangular Patch Antennas –Geometry
and Parameters, Impact of different parameters on characteristics. Broadband Antennas:
Helical Antennas – Significance, Geometry, basic properties; Design considerations for
monofilar helical antennas in Axial Mode and Normal Modes (Qualitative Treatment).
UNIT V:
VHF, UHF AND MICROWAVE ANTENNAS: Reflector Antennas : Flat Sheet and
Corner Reflectors. Paraboloidal Reflectors – Geometry, characteristics, types of feeds, F/D
Ratio, Spill Over, Back Lobes, Aperture Blocking, Off-set Feeds, Cassegrain Feeds.
Horn Antennas – Types, Optimum Horns, Design Characteristics of Pyramidal Horns; Lens
Antennas – Geometry, Features, Dielectric Lenses and Zoning, Applications, Antenna
Measurements – Patterns Required, Set Up, Distance Criterion, Directivity and Gain
Measurements (Comparison, Absolute and 3-Antenna Methods).
WAVE PROPAGATION: Concepts of Propagation – frequency ranges and types of
propagations. Sky Wave Propagation – Formation of Ionospheric Layers and their
Characteristics, Mechanism of Reflection and Refraction, Critical Frequency, MUF and
Skip Distance – Space Wave Propagation – Mechanism, LOS and Radio Horizon.– Radius
of Curvature of path, M-curves and Duct Propagation,.
AWP Important Questions Pdf Download with Syllabus 2024
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