JAYPEE INSTITUTE OF INFORMATION TECHNOLOGY
Electrical Science-1 (15B11EC111)
Assignment-2
Maximum Marks: 5
CO1
CO2
CO3
CO4
CO5
Recall the concepts of Electromagnetic field theory, relate different types of
antennas, and define antenna parameters.
Explain the working of wired antennas. Classify and compare different dipole
antennas and loop antennas.
Build different configurations of Array Antenna and utilize their terminologies to
construct different array antennas.
Distinguish modes of propagation and examine the propagation of radio waves in
different atmospheres.
Design and develop different Broadband antennas, Aperture antennas, Reflector
antennas and modern antennas. Estimate the radiation pattern, polarization and
VSWR of the antennas.
Q. 1 [CO5]
Design a helical antenna operating in the axial mode that gives a directivity of 14
dB. For this helical antenna, calculate the input impedance, half power beamwidth,
first null beamwidth and the axial ratio. (consider Cλ =1 and Sλ = 1/4)
Q. 2 [CO5]
A prime focus parabolic reflector antenna is to be designed at 3 GHz for a gain of
40 dBi. Assume efficiency of 65%. Find the Diameter of the parabolic reflector.
Q. 3 [CO5]
A suspended rectangular MSA has L = 8 cm and W = 9 cm. The substrate
parameters are: εr = 4.4, h = 0.16 cm. The approximate resonance frequency of the
antenna is:
An antenna with a gain, G dB, is transmitting 10 W power at 10 GHz and another
antenna with a gain 3 dB higher than transmit antenna is used to receive the
electromagnetic signal. The received power is 0.021 mW with the two antennas
separated by a distance of 12 m. Calculate the gains of the two antennas.
Q. 4 [CO5]
Q. 5 [CO4]
Calculate angle of incident for radio wave transmission if electron density is
100×109 /m3 and muf is 6 MHz.