Important Questions
Prepared by
Santhosh (Admin )
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1.Radiation from oscillating dipole, Half wave dipole,Folded dipole 2.Radiation Resistance UNIT-2 1.Feeding structures,techniques 2.Slot antennas,Horn antenna , Reflector antenna , UNIT-3 1.Phased arrays, Adaptive array 2.N element linear array 3.Pattern multiplication
Don't share it as screenshot UNIT-4 1.Radiation pattern, Polarization, VSWR 2.Helical antenna, Log periodic. Modern antennas UNIT-5 1.Structure of atmosphere,Tropospheric propagation 2.Flat earth and Curved earth concept Sky wave propagation,Reflection and refraction in ionosphere 3.Ground wave propagation
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SYLLABUS
UNIT I FUNDAMENTALS OF RADIATION 9
Definition of antenna parameters – Gain, Directivity, Effective aperture, Radiation Resistance, Band width, Beam width, Input Impedance. Matching – Baluns, Polarization mismatch, Antenna noise temperature, Radiation from oscillating dipole, Half wave dipole. Folded dipole, Yagi array.
UNIT II APERTURE AND SLOT ANTENNAS 9
Radiation from rectangular apertures, Uniform and Tapered aperture, Horn antenna , Reflector antenna , Aperture blockage , Feeding structures , Slot antennas ,Microstrip antennas – Radiation mechanism – Application ,Numerical tool for antenna analysis
UNIT III ANTENNA ARRAYS 9
N element linear array, Pattern multiplication, Broadside and End fire array – Concept of Phased arrays, Adaptive array, Basic principle of antenna Synthesis-Binomial array
UNIT IV SPECIAL ANTENNAS 9
Principle of frequency independent antennas –Spiral antenna, Helical antenna, Log periodic. Modern antennas- Reconfigurable antenna, Active antenna, Dielectric antennas, Electronic band gap structure and applications, Antenna Measurements-Test Ranges, Measurement of Gain, Radiation pattern, Polarization, VSWR
UNIT V PROPAGATION OF RADIO WAVES 9
Modes of propagation , Structure of atmosphere , Ground wave propagation , Tropospheric propagation , Duct propagation, Troposcatter propagation , Flat earth and Curved earth concept Sky wave propagation – Virtual height, critical frequency , Maximum usable frequency – Skip distance, Fading , Multi hop propagation
