A four port network has the scattering matrix shown below 0 .1 90 o 0 .8 − 45 o S = 0 .3 − 45 o 0
0 .8 − 45 o
0 .3 45 o
0
0
0
0
0 .4 45 o
0 .6 − 45 o
4 0
(a)
(8)
0 .4 45 o 0 .6 − 45 o 0 0
(i)
Is this network lossless?
(ii)
Is this network Reciprocal?
(iii)
What is the return loss at port 1 when all other ports are terminated with matched loads?
(iv)
What is the insertion loss and phase dialog between ports 2 and 4, when all other ports are terminated with matched loads?
(v)
What is the reflection coefficient seen at port 1 in a short circuit is placed at the terminal plane of port 3, and all other ports are terminated with matched loads?
0
4
13.
Microshipline matching networks.
Or
(a)
(i)
Isolator
(ii)
Circulator.
4
14.
Discuss the structure and principle of operation of : (8) (8)
With neat diagram, Explain the working principle of Gunndiode. Mention its application.
4
(b)
Or
(i)
Avalanche transit time diode.
(ii)
Parametric amplifier.
(a)
4
(b)
(8) (8)
Explain the operation of two cavity Klystron amplifier and compare it with traveling wave tube. Or
4
15.
Explain the characteristics and working of :
0
(b)
(i)
Explain the principle of microwave power measurements.
Derive the equation for power output and efficiency of two cavities and four cavity klystron. amplifiers. (16). 3. With neat diagrams and relevant equations, explain about helix traveling wave tube. (16). 4. With neat diagram, explain about Magnetron
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Ali A. Behagi received the Ph.D. degree in electrical engineering from the University of Southern. California and the MS degree in electrical engineering from the University of Michigan. He has. several years of industrial experience with Hughes Airc
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