STUPIDSID
1 (a)
Give reasons Why GaAs MESFET perform better than Si MESFET
5 M
1 (b)
Explain microwave propagation in Ferrites
5 M
1 (c)
State and explain Lorentz Reciprocity Theorem
5 M
1 (d)
An IMPATT diode has a drift length of 2 ?m and drift velocity is of the order of 105 m/s. Determine-
(i) the drift time of the carriers
(ii) the operating frequency of the IMPATT diode.
(i) the drift time of the carriers
(ii) the operating frequency of the IMPATT diode.
5 M
2 (a)
Mention different types of electron flow. Explain Brillouin flow and derive an expression for Brillouin magnetic field Br.
10 M
2 (b)
Describe the mechanism of velocity modulation in a two cavity klystron and hence obtain an expression for the bunched beam current. Also find out condition for maximum power output.
10 M
3 (a)
A microstrip transmission line uses a subtrate with dielectric constant ?r=9.7 and thickness 0.5 mm. the stripwidth is also 0.5 mm. find the effective dielectric constant, the characteristics impedance and the microstrip wavelength at a frequency of 2 GHz.
8 M
3 (b)
Discuss the differences between transferred electron devices and avalanche transit time devices. Give example
6 M
3 (c)
Discuss the factors that limit the high frequency response of a microwave BJT.
6 M
4 (a)
Design a double stub matching system to match a normalized load admittance yL=0.4+j1. the stubs ae spaced ?/8 apart
10 M
4 (b)
Discuss the operation of backward wave devices
10 M
5 (a)
What are different microwave band classification? Give applications of various microwave bands. What is the band rectangle waveguide with dimensions 2.3 cm and 1 cm
10 M
5 (b)
Calculate -(i) generated power (ii) the total r.f. power output (iii) the power gain in dB for a CFA operating with the following parameters:-
Ancode dc current la0 = 1.30 Amp
Anode dc voltage -Va0 = 1.80 KV
Electronic effciency= ?e = 22%
Input r.f. power Pin =70 Watts
Ancode dc current la0 = 1.30 Amp
Anode dc voltage -Va0 = 1.80 KV
Electronic effciency= ?e = 22%
Input r.f. power Pin =70 Watts
10 M
6 (a)
Explain the working of Magic Tee. Design a circulator using Magic Tees.
10 M
6 (b)
Design a low pass composite filter with cutoff frequency of 2 MHz and impedance of 75 ?. Place the infinite attenuation pole at 2.05 MHz
10 M
7 (a)
Explain the working of a negative resistance parameteric amplifier
10 M
7 (b)
Explain the procedure of measurement of Dielectric constant at microwave frequency.
10 M
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