STUPIDSID
1(a)
Starting from fundamental, derive the expression for the voltage and current at any point on the transmission line.
8 M
1(b)
A transmission line has the following primary constants R = 10.4 Ω/km, L = 0.00367 H/km, G = 0.8 × 10-6 ℧/km , C = 0.000835 μF/km. Find α, β, γ, λ and z0.
6 M
1(c)
Define and derive expression for reflection coeficient and transmission coefficient for a transmission line.
6 M
2(a)
A load of ZR = 115 - j75Ω terminates at a lossless 100Ω line.Use Smith chart to determine: (i) SWR, (ii) I/P impedance of a 0.2λ long line, (iii) the distance from load to first voltage maximum.
8 M
2(b)
With neat diagram, explain Faraday's rotation isolator.
5 M
2(c)
With diagram, explain working of two hole direction coupler and also derive s-matrix for the same.
7 M
3(a)
Explain with a neat diagram the construction and working of PIN diode and Schottkey barrier diode.
10 M
3(b)
An M-Si-M BARITT diode has the following parameter:
i) Relative dielectric constant of silicon εr = 118.
ii) Donor concentration, N = 2.8 × 1021/m3
iii) Silicon length, L = 6μm
Determine the breakdown voltage and the breakdown electric field.
i) Relative dielectric constant of silicon εr = 118.
ii) Donor concentration, N = 2.8 × 1021/m3
iii) Silicon length, L = 6μm
Determine the breakdown voltage and the breakdown electric field.
5 M
3(c)
What is Gunn effect? Explain with constructional details of a Gunn diode.
5 M
4(a)
Derive the following losses in a microwave network in terms of S-parameter:
i) Insertion loss
ii) Transmission loss
iii) Reflection loss
iv) Return loss
i) Insertion loss
ii) Transmission loss
iii) Reflection loss
iv) Return loss
6 M
4(b)
State and explain properties of S-parameters.
6 M
4(c)
Two transmission lines of characteristics impedance z1 and z2 are joined at plane pp1. Express s-parameter in terms of impedance.
8 M
5(a)
With neat diagram, explain the working of rotary precision phase shifter.
10 M
5(b)
Explain H-plane Tee junction and derive the S-matrix also.
6 M
5(c)
A 20 MW signal is fed into one of collinear port 1 of a lossless H-plane T-junction. Calculate power delivered through each port when other ports are terminated in matches load.
4 M
6(a)
Explain the various losses taking place in microstriplines.
7 M
6(b)
Explain the construction and field pattern for microstripline.
8 M
6(c)
Compare stripline and microstripline.
5 M
7(a)
Derive Radar range equationo in terms of effective aperture, radar cross section of target and minimum detectable signal power of receivers.
8 M
7(b)
Discuss various application of Radar.
6 M
7(c)
With respect to Radar system explain:
Mximum unambiguous Range
ii) Clutter attenuation
iii) Improvement factor
iv) Doppler shift
Mximum unambiguous Range
ii) Clutter attenuation
iii) Improvement factor
iv) Doppler shift
6 M
8(a)
Explain MTI Radar with neat block diagram.
10 M
Write short notes on any two:
8(b)(i)
Delay line canceller
5 M
8(b)(ii)
C.W. Doppler Radar
5 M
8(b)(iii)
Pulsed Radar
5 M
8(b)(iv)
Blind speed
5 M
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