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B.N.M. Institute of Technology

An Autonomous Institution under VTU
Model Question Paper
Sixth Semester BE, 2022 Scheme
Microwave & Antennas – 22ECE162
Duration: 3 Hour Max. Marks: 100

Note: 1. Answer one full question from each Module 1,2,3,4,5 (5Q x 20M=100 Marks)

Module 1
Cognitive
Q. No Questions Marks CO PO
Level
Develop an expression for transverse components
1 (a) of electric and magnetic field propagation of 8 CO1 1,2 Apply
TMMN mode in a rectangular waveguide.
Develop an expression for wave impedance of
1 (b) 6 CO1 1,2 Apply
TE and TM modes.
Calculate the guide wavelength, the group velocity
and the phase velocity of 2.5GHz signal propagated
1 (c) 6 CO1 1,2 Apply
in a 10cm breadth rectangular waveguide for the
dominant mode.
OR
Develop an expression for resonant frequency of a
2 (a) 8 CO1 1,2 Apply
rectangular waveguide cavity resonator
Prove unitary property of s-matrix for a lossless 6 CO1 1,2 Apply
2 (b)
junction
2 (c) Prove S-matrix is Phase shift property for a 6 CO1 1,2 Apply
reciprocal network.
Module 2
Illustrate the working principle of helix type
3 (a) 6 CO2 1,2 Apply
travelling wave tube with a neat diagram.
3 (b) Explain briefly precision type variable attenuator. 6 CO2 1,2 Understand
Write a short note on 1) Faradays isolator.
3 (c) 8 CO2 1,2 Understand
2)Phase Shifters
OR
Illustrate the working principle of reflex klystron
4 (a) 6 CO2 1,2 Apply
with a neat diagram.
With a neat sketch, Explain the operation of E
4 (b) 6 CO2 1,2 Understand
plane Tee and also write its S matrix.
Write a short note on 1)Directional Coupler
4 (c) 8 CO2 1,2 Understand
2)Power Divider
Module 3
5(a) Explain the following parameters of an antenna 8 CO3 1,2 Understand
1) Radiation Pattern 2) Half Power Beam Width

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3) Beam area 4) Beam Efficiency.

Find i)half power beamwidth ii) beamwidth .

An antenna has a field pattern given by E(θ)= cosθ
5 (b) 6 CO3 1,2 Apply
cos2θ for 0≤ θ≤π/2 .
between first nulls.
Show that maximum effective aperture of a short
5 (c) 6 CO3 1,2 Apply
dipole antenna is 0.119λ2
OR
Derive an expression for Radiation Resistance of 1,2
6 (a) 8 CO3 Understand
Short Electric Dipole.
Develop an expression for Friis transmission 1,2
6 (b) 6 CO3 Apply
formula.
Find the power delivered to the receiver? A radio
link has a 15w transmitter connected to an antenna
of 2.5m2 effective aperture at 5Ghz. The receiving
6 (C) antenna has an effective aperture of 0.5m2 and is 6 CO3 1,2 Apply
located at a 15km line of sight distance from the
transmitting antenna .Assume lossless antennas.

Module 4
Develop an expression for electric field of two 1,2
7 (a) 8 CO4 Apply
isotropic point source of same amplitude and phase.
Develop an expression for electric field of linear CO4
7 (b) array of n-isotropic point sources of equal 7 1,2 Apply
amplitude and spacing.
Show that the directivity for unidirectional CO4
7 (c) operations is 2(n+1) for an intensity variation 5 1,2 Understand
of Umcosnθ.
OR
Find the directivity of antenna with a radiation CO4
8 (a) intensity of U=Umsinθsin2Φ where 0≤θ≤π and 8 1,2 Apply
0≤ Φ ≤π.
Derive an expression for Radiation Resistance of CO4 1,2
8(b) 7 Apply
Thin linear antenna.
State and prove power theorem. How power
8 (c) theorem is applied to find power radiated by an 5 CO4 1,2 Understand
isotropic antenna in terms of its radiation intensity.
Module 5
9 (a) Explain mode of operations of helical antenna. 8 CO5 1,2 Understand

9 (b) Explain the basic operation of Yagi-Uda antenna 6 CO5 1,2 Understand

9 (c) Explain the working of Log Periodic antenna 6 CO5 1,2 Understand
OR
Write a short note on 1,2 Understand
10 (a) 8 CO5
(i) Parabolic reflector (ii) Corner reflector
10 (b) Explain various types of horn antennas with neat 6 CO5 1,2 Understand

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diagrams. Why flaring of walls in waveguide in

case of horn antennas is necessary.?
Explain different feeding methods in Microstrip CO5 1,2 Understand
10 (c) 6
patch antenna

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