STUPIDSID
1 (a)
Define Following:
Microwave, Transmission coefficient, Pure travelling wave, Pure Standing wave, Blind speed, Phase Velocity, Velocity modulation
Microwave, Transmission coefficient, Pure travelling wave, Pure Standing wave, Blind speed, Phase Velocity, Velocity modulation
7 M
1 (b)
1) Discuss in brief the advantages of microwave.
2) A transmission line has a characteristic impedance of 75+j0.01Ω and is terminated in a load impedance of 70+j50Ω Calculate the reflection coefficient and Transmission coefficient. Also verify the relationship T2=Z√Z0(1-T2),Where T= Transmission coefficient and T=Reflection coefficient.
2) A transmission line has a characteristic impedance of 75+j0.01Ω and is terminated in a load impedance of 70+j50Ω Calculate the reflection coefficient and Transmission coefficient. Also verify the relationship T2=Z√Z0(1-T2),Where T= Transmission coefficient and T=Reflection coefficient.
7 M
2 (a)
Define Standing wave and derive equation of the voltage standing wave. Also find
equations for the minimum and maximum amplitude and distance between any
two successive maxima or minima. Draw the standing wave pattern for lossy and
lossless line.
7 M
2 (b)
State the characteristics of smith chart. A lossless transmission line has
characteristic impedance 50Ω is terminated in a load impedance 50+j50Ω the operating wavelength λ=40cm. Find out 1st Vmax and V min from load using smith chat also find VSWR.
7 M
2 (c)
Which are the merits of double stub impedance matching compare to single stub. A single stub tuner is to match a lossless line of 400Ω to a load of 800-j300 Ω.The characteristic impedance of stub is 400 Ω. The frequency is 3 GHz. Find the distance in meters from the load to the tuning stub. Determine the length in meters of the short circuited stub. Find two possible solutions.
7 M
3 (a)
Explain in detail E-plane Tee. With S-matrix prove that the Tee junction cannot
be matched to all the three arms simultaneously.
7 M
3 (b)
Describe properties of S-parameters. Explain working of two-hole directional
coupler and derive it's S-Matrix.
7 M
3 (c)
How are waveguides different from normal two-wire transmission line? Discuss similarities and dissimilarities. Show that TEM wave cannot propagate in a waveguide by making use of Maxwell's equations.
7 M
3 (d)
Explain the terms cutoff wavelength and dominant mode. Determine the cutoff
wavelength for the dominant mode in a rectangular waveguide of breadth 10 cms.
For a 2.5 GHz signal propagated in this waveguide in the dominant mode;
calculate the guide wavelength, the group and phase velocities?
7 M
4 (a)
What is velocity modulation? Explain with diagram how velocity modulation is
utilized in Klystron amplifier?
7 M
4 (b)
Explain GUNN effect. Describe the construction of GUNN diode and mention
performance, characteristics and applications.
7 M
4 (c)
Explain favorable and unfavorable electrons with respect to Magnetron. Explain the performance of magnetron and list important applications.
7 M
4 (d)
What are avalanche transit time devices? Explain the operation, construction and
application of the IMPATT diode.
7 M
5 (a)
Derive the radar range equation. Enlist the factor affecting the range of radar. A
marine radar operating at 10GHz has a maximum range of 50km with an antenna
gain of 4000. If the transmitter has a power of 250KW and minimum detectable
signal of 10-11 W. Determine the cross-section of the target the radar can sight.
7 M
5 (b)
Explain the principle of MTI radar with block diagram.
7 M
5 (c)
What is microstrip line? Derive equation of characteristic impedance and quality
factor of microstrip line.
7 M
5 (d)
Explain different display methods of RADAR.
7 M
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