Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2161003 Antenna And Wave Propagation Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161003 Date:14/05/2019
Subject Name:Antenna & Wave Propagation
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
Figures to the right indicate full marks.
Q.1 (a) Define terms with respect to Antenna systems: 07
1) Antenna 2) Beam efficiency 3) Radiation intensity 4) Directivity 5)
Gain of the antenna 6) Effective length of antenna 7) Effective aperture.
(b) Define terms Polarization and modes of propagating waves. With 07
appropriate figures describe different polarizations of an EM wave
while its propagation.
Q.2 (a) List out various types of Antenna systems. 03
(b) ?Radiation resistance of a quadrature wavelength monopole antenna 04
is 36.5 ??. Justify your answer with necessary calculations for it.
(c) Explain in detail about Hertzian Dipole antenna systems. Also calculate 07
radiation resistance value of a Hertzian dipole antenna of having length
?/40, ?/60 and ?/80 respectively.
OR
(c) Obtain the ratio of E? and H? field components of a current element at 07
a distance point in free space with necessary derivations using
Maxwell?s equation.
Q.3 (a) Enlist different atmospheric layers with their approximate height, to 03
be considered while wave propagation.
(b) Describe the principle of pattern multiplication in the working of Array 04
antennas.
(c) State Babinet?s principle and discuss its usability in the slot antennas 07
and complementary antennas. ?Log periodic antenna offers wide band
width operations.? Justify your answer.
OR
Q.3 (a) Draw field pattern of an array of 4 isotropic point sources. separated by 03
half wave length distance.
(b) Enlist and discuss about various antenna field radiation zones briefly. 04
(c) Prove that during wave propagation phenomenon MUF=fc/Cos(?). 07
Also derive equations of gain of parabolic disc antenna.
Q.4 (a) Explain about log periodic antenna with necessary figures. 03
(b) Enlist different feeding methods for antenna systems and describe any 04
one of them in detail.
(c) List out all antenna Gain measurement methods and describe any two 07
of them in detail.
OR
Q.4 (a) Explain about loop antenna with necessary details. 03
(b) Describe lens antenna in detail. 04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161003 Date:14/05/2019
Subject Name:Antenna & Wave Propagation
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
Figures to the right indicate full marks.
Q.1 (a) Define terms with respect to Antenna systems: 07
1) Antenna 2) Beam efficiency 3) Radiation intensity 4) Directivity 5)
Gain of the antenna 6) Effective length of antenna 7) Effective aperture.
(b) Define terms Polarization and modes of propagating waves. With 07
appropriate figures describe different polarizations of an EM wave
while its propagation.
Q.2 (a) List out various types of Antenna systems. 03
(b) ?Radiation resistance of a quadrature wavelength monopole antenna 04
is 36.5 ??. Justify your answer with necessary calculations for it.
(c) Explain in detail about Hertzian Dipole antenna systems. Also calculate 07
radiation resistance value of a Hertzian dipole antenna of having length
?/40, ?/60 and ?/80 respectively.
OR
(c) Obtain the ratio of E? and H? field components of a current element at 07
a distance point in free space with necessary derivations using
Maxwell?s equation.
Q.3 (a) Enlist different atmospheric layers with their approximate height, to 03
be considered while wave propagation.
(b) Describe the principle of pattern multiplication in the working of Array 04
antennas.
(c) State Babinet?s principle and discuss its usability in the slot antennas 07
and complementary antennas. ?Log periodic antenna offers wide band
width operations.? Justify your answer.
OR
Q.3 (a) Draw field pattern of an array of 4 isotropic point sources. separated by 03
half wave length distance.
(b) Enlist and discuss about various antenna field radiation zones briefly. 04
(c) Prove that during wave propagation phenomenon MUF=fc/Cos(?). 07
Also derive equations of gain of parabolic disc antenna.
Q.4 (a) Explain about log periodic antenna with necessary figures. 03
(b) Enlist different feeding methods for antenna systems and describe any 04
one of them in detail.
(c) List out all antenna Gain measurement methods and describe any two 07
of them in detail.
OR
Q.4 (a) Explain about loop antenna with necessary details. 03
(b) Describe lens antenna in detail. 04
2
(c) Describe phase measurement method used in antenna system in detail. 07
Q.5 (a) Describe Ultra-Wide Band (UWB) antenna in brief. 03
(b) Draw five elements Yagi-Uda antenna system. Suggest ways to 04
improve working performance of basic Yagi-Uda antenna.
(c) Explain terms with reference to Wave propagation phenomenon: (i) 07
Duct propagation (ii) Virtual height (iii) MUF (iv) Skip distance
OR
Q.5 (a) Describe Smart antennas briefly. 03
(b) Differentiate End fire and Broadside array antennas. 04
(c) Describe Micro strip antenna in detail. Also enlist advantages and dis 07
advantages related to them.
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This post was last modified on 20 February 2020