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Posted By: Aparanjitha Member Level: Gold Posted Date: 25 May 2008
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2007 Andhra University B.E Microwave Engineering Question paper
First question is compulsory
Answer any four out of the remaining questions
All questions carry equal Marks
1)
a)List any two applications of Mixer.
b)what is Re-entrant cavity?
c)Give the principle of working of Magnetron
d)List any two properties of scattering matrix
e)List any two Fabrication techniques used for MIC
f)what is LSAmode of operation in a GUNN diode?
g)State any two applications of Tunnel diode.
2
a)what is magic tree?explain
b)An air filled circular wave guode has a radius of 3cm and is used as a respmatpr fpr TEo.,mode at 10GHz by placing two perfectly conduction plates at its two ends. Determine the minimum distance between the two end planes.
3)
a)Describe the advantages and disadvantages of parameteric devices.
b)A KV-band IMDTS diode has a pulsed operating voltage of 100v and a pulsed operating current of 0.9 A. The efficiency is about 10%.Calculate
i)the o/p power
ii) The duty cycle if the pulse width is 0.01 ns and the frequency is 16GHz.
4)a)A reflex Klystron operates at the peak mode of n=2 with beam voltage:V0=300V m beam current ofI0=20mA; signal voltave(V1)=40V. Determine
i)the i/p powe in watts
ii)the o/p power in watts
iii)the efficiency
b)Describe the principle and operation of a normal circular magnetron and lists its characteristics.
5)
a) Derive 'S' matrix for a directional coupler
b)A GaAs MOSFET balanced amplifier with two large couplers gas the following parameters
Sparameters S11a=S11b
S22a=S22b
i/p signal power Pin=200mW
power gain of each GaAs chip . Gain =10dB.Determinei)i/p GOIP USWR ii)the o/p power in watts iii)the linear o/p power gain in dB
6)
a) List the basic characteristics required for an ideal substrate material in the case of MICs
b)Describe the basic fabrication techniques used for MIC:epitaxy , diffusion, deposition and etching
7)a)Explain how do you measure VSRW<10
b)How directivity is measured and explain with the help of a neat sketch?
8)write short notes on any three of the following:
a)frequency measurement
b)Tunnel diode
c)microwave filters
d)any two microwave applications
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