STUPIDSID
1 (a)
Derive the transmission line equations by the method of distributed circuit theory.
10 M
1 (b)
A 300 Ω line is terminated in a load of (600+j300) Ω operating at 600 Hhz. Find the of SWR and design a single stub matching system.
10 M
2 (a)
Using Helmholtz equation, derive the field equation for TM mode in rectangle waveguide.
10 M
2 (b)
What is circulator? Explain the working of a 4-port circulator using magic tees and write S-matrix.
10 M
3 (a)
What is GUNN diode? Explain LSA and TT modes.
10 M
3 (b)
What are the difference between microwave transistor and TEDs? Give few examples.
5 M
3 (c)
An IMPATT diode with nominal frequency 10 GHz has Cj=0.5 pF, Lp=0.5 nH Cp=0.3 pF at breakdown bias of 80 V and bias current 80 mA. The RF peak current 0.65 A for Rd= -2 Ω. Find i) Resonant frequency ii) Efficiency.
5 M
4 (a)
State and prove symmetric property of S-matrix.
8 M
4 (b)
What are S-parameters? Explain the S-parameters for two port network.
8 M
4 (c)
The S-parameters of a 2 port network are given by S11=0.2∠0, S22=0.1∠0, S12= 0.6∠90° and S21=0.6∠90°. Is the network reciprocal? Lossless?
4 M
5 (a)
What is attenuator? Derive its S-matrix.
8 M
5 (b)
Write a note on: i) phase shifter ii) Coupling loop.
6 M
5 (c)
A 20 mW signal is fed into one of the collinear port 1 of a lossless H-plane T Junction. Calculate the power delivered through each port when other ports are terminated in matching load.
6 M
6 (a)
Write a note on lossless in the microstrip line.
8 M
6 (b)
Explain co-planar strip lines and shielded strip line.
6 M
6 (c)
A shielded strip has the following parameter εr=2.56, strip width =25 mils, Strip thickness = 14 mils and shield depth = 70 mils. Calculate i) the k-factor ii) friction capacitance ii) Impedance of the line.
6 M
7 (a)
Derive the basic radar range equation.
10 M
7 (b)
Write a note on: i) Origin of radar ii) Applications of radar.
4 M
7 (c)
A 10 GHz radar has the following characteristics P1= 250 kW, Prf=1500 PPS, P-width = 0.8 μs, power gain of antenna = 2500, Smin = 10-14W, Ac=10 m2, σ=2 m2. i) R unambiguous ii) Maximum possible range iii) Duty cycle iv) Average power.
6 M
8 (a)
What is blind speed? How can we eradicate it?
8 M
8 (b)
Explain digital MTI processing.
8 M
8 (c)
A CW radar operates at frequency of 10 Ghz. What is the Doppler frequency produced i) an aeroplane plying at a speed of 250 kmph ii) a man crawling at 2.5 cm/sec. What you understand?
4 M
More question papers from Microwaves & RADAR