JNTU
JNTU B.Tech III ANTENNAS AND PROPAGATION Previous Question Paper (February - 2023 - R18)
Answer all questions in Part A. Answer any one question from each unit in Part B.
Part A
Define effective height.
Answer
The effective height (he) of an antenna is defined as the ratio of the induced open-circuit voltage at the antenna terminals to the electric field intensity of the incident wave, assuming the field is uniform over the height of the antenna.
What is meant by radiation resistance?
Answer
Radiation resistance (Rr) is a hypothetical resistance value that, if replaced by a resistor at the antenna terminals, would dissipate the same amount of power as the antenna radiates into space when a specific current flows through it. It represents the efficiency of the antenna in converting electrical energy into electromagnetic radiation.
Define Point source in antenna arrays.
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What is source of errors?
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Write the applications of Horn antenna.
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What is monofilar helical antenna?
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Define feed method in reflector antennas.
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What are different types of reflectors?
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Define space and surface waves in ground wave propagation.
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What is multi hop propagation?
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Part B
Discuss about Retarded potentials in antennas.
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Explain about Oscillating Dipole.
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Explain and derive the equation of Radiation resistance of Quarter-wave monopole.
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Compare Far fields of small loop and short dipole.
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Explain the principle and operation of pattern of multiplication.
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Discuss about Field strength of Uniform linear array.
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Explain the measurement of Directivity in any method.
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How uni directional pattern is obtained in end-fire array?
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Draw and explain the pyramidal Horn Antenna.
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Explain about folded dipole with neat diagram and write its applications.
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Explain the principle and operation of Helical antenna with neat diagram.
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Design a three element Yagi-Uda antenna to operate at a frequency of 172 MHz.
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Discuss about rectangular patch antenna and write its limitations.
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Write the pattern characteristics of reflector antenna.
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Explain about parabolic reflector antenna with neat diagram.
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A parabolic reflector with a mouth diameter of 22 meters operates at 5 GHz frequency, efficiency of 0.6. Find the power gain?
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Explain the reflection of radio waves by the surface of the earth in ground wave Propagation.
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Discuss about effect of the curvature of the earth in space wave propagation.
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Write short notes on:
MUF
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Ray path
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Characteristics of Ionosphere
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Duct Propagation
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