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1 An Isotropic Antenna Has Power of 100kw Delivered To It Find Power Density at I) 100m Ii) 1km Ii) 100km

This document contains problems related to antennas and electromagnetic radiation: 1. It asks to calculate the power density at distances of 100m, 1km, and 100km from an isotropic antenna radiating 100kw of power. 2. It describes two point source antennas separated by a distance d with a given field pattern and asks to plot the radiation pattern for a specific wavelength and phase angle. 3. It provides parameters for a monopole antenna and asks to calculate the current required to provide a given radiation field amplitude at a distance and to radiate a total power.

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215 views14 pages

1 An Isotropic Antenna Has Power of 100kw Delivered To It Find Power Density at I) 100m Ii) 1km Ii) 100km

This document contains problems related to antennas and electromagnetic radiation: 1. It asks to calculate the power density at distances of 100m, 1km, and 100km from an isotropic antenna radiating 100kw of power. 2. It describes two point source antennas separated by a distance d with a given field pattern and asks to plot the radiation pattern for a specific wavelength and phase angle. 3. It provides parameters for a monopole antenna and asks to calculate the current required to provide a given radiation field amplitude at a distance and to radiate a total power.

Uploaded by

deeepakkhadse
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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EME

TE(E&C) SESSION 2009-10


TUOTURAL UNIT -V

1 An Isotropic antenna has power of 100kw delivered to it find power density at


i) 100m ii ) 1km ii) 100km .
2 Two identical point source are separated by a distance ‘d’ Each source has a field
pattern given by E0 = E1 sin ө , IF ,d = λ\ 2 & α = 0 Plot the radiation pattern
3 A monopole antenna in free space extending vertically over a perfectly conducting plane has
a linear current distribution . If the length of the antenna is 0.01 λ, what value of Io is
required to ,
i) Provide a radiation field amplitude of 100 mV/m at a distance of 1km at ө =90 .
ii) radiate a total power of 1w.
4 Radiation resistance of an antenna is 72 Ω and loss resistance of 8 Ω What is the directivity if the
power gain is 20.

5 Explain the radiation resistance find the radiation resistance of an antenna 1/10 wavelength
long.
6 A thin dipole is λ\ 15 long if its loss resistance 1.5 Ω. Calculate its gain and effective aperture.

EME
TE(E&C) SESSION 2010-11
TUOTURAL UNIT -V
1Radiation resistance of an antenna is 72 Ω and loss resistance of 8 Ω What is the directivity if the
power gain is 20.

2 Explain the radiation resistance find the radiation resistance of an antenna 1/10 wavelength
long.
3 A thin dipole is λ\ 15 long if its loss resistance 1.5 Ω. Calculate its gain and effective aperture.

4 A half wave dipole radiating in free space is driven by a current of 5 A at the terminal
calculate E and H field 1km from the antenna at angular of 1) 450 2 ) 900

5 Distance between two antenna is λ\ 2 and 2nd antenna current is 1800 lagging Draw the radiation
pattern for antenna.
6 An end fire array consist of 8 isotropic radiators which are placed at a distance of λ\4, sketch
radiation pattern.
EME
TE(E&C) SESSION 2011-12
TUOTURAL UNIT -V
1 A half wave dipole radiating in free space is driven by a current of 5 A at the terminal
calculate E and H field 1km from the antenna at angular of 1) 450 2 ) 900
2 Distance between two antenna is λ\ 2 and 2nd antenna current is 1800 lagging Draw the radiation
pattern for antenna.
3 An Isotropic antenna has power of 20kw delivered to it find power density at 100km .

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