microwaves & radar jan 2014
TRANSCRIPT
USN 06EC54
(06 Marks)
Fifth Semester B.E. Degree Examination, Dec.2013 lJan.2$l4Microwaves and Radar
Max. Marks:100
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2 a. Obtain the expression for wave impedance for TM wave propagation through a rectangularwave guide. ,' (08 Marks)
b. An air filled circular waveguide having an inner radius of ,1 cm is excited in dominant modeat 10 GHz. Find i) the cut off frequency of dominant mode. ii.1 guide wave length iii) wave
Time: 3 hrs.
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6a.b.
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8a.
Note: l. Answer FIVEfull questions, selectingut least TWO questions from each purt.
2. Missing datu may be suitably assumed.3. Smith chart is permitted.
PART _ AWhat are the applications of smith chart? Explain briefly.
State and explain the properties of S-parameters.Explain S-matrix representation of multiport network.
Define reflection co-efficient and derive the equation for reflection co-efficient. (10 Marks)
A trans,mission line has R : 2 e.lm. G : 0.5 mmho/m, f: I GHz,L = 8 nH/m, C : 0.23 pF.
Calculate i) the characteristic impedance ii) the propagation constant. (0zl Marks)
impedance. (04 Marks)
oscillations. (10 Marks)
c. Explain the construction, working and application of isolator based on Faraday rotation.(08 Marks)
3 a. Explain construction and operation of Gurrn diode in the Gunn mode and LSA mode.(10 Marks)
b. With neat diagram, explain the construciion operation of IMPATT diode and mechanism of
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€rwrite the relationship of ABCD parameters with z parameterc i\n[ "[Ei;*PAr 'v\___,With a neat diagiam, explain the operation of microwave attenuatOr\@,-
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Explain the characteristics of a magic tee, obtain S-matrix representation.Explain the construction of a co-axial cable.
Explain the construction and field patterns for microstrip line.Explain the different losses taking place in microstip line.
Determine the cross-section of the target the radar can sight.Explain briefly the applications of radars.
With a neat block diagram, explain working principle of MTI radar.With a neat block diagram, explain the operation of a pulse Doppler radar.
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A shielded strip line has dielectric constant of the insulator e,=2.56, strip wi&h W :25mils, strip thickness t: 14 mils, shield depth d: 70 mils. Calculate i) K factor i, thelringe capacitance iii) the characteristic impedance of the line. (06 Marks)
Derive the simple radar range equation. (10 Marks)A marine radar operating at 10 GHz has a maximum range of 50 km with an antenna gain of4000. The transmitter has a power of 250 KW and a minimum detectable signal of 10-rr W
(08 Marks)(06 Marks)
(04 Marks)(06 Marks)
(10 Marks)(10 Marks)
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