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Posted By: neyha Member Level: Diamond Posted Date: 08 May 2008
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2005 Anna University Electronics and Communication B.E./B.TECH.DEGREE EXAMINATION :MICROWAVE ENGINEERING Question paper
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B.E./B.TECH.DEGREE EXAMINATION ,NOV/DEC 2005
VII -SEMESTER
MICROWAVE ENGINEERING
TIME :3 hrs
MAX MARKS :100
PART -A (10 X 2 = 20 MARKS)
1. Write down the ABCD parameters of a lossless transmission line.
2. State the 'PHASE SHIFTING' property of S- parameters
3. Stae the two parameters that describe a directional coupler. Define them
4. Calculate the attenuation of a rotary vane attenuator if the angle of roatation is 34 degrees
5. What is TUNING with respect to microwave oscillators ? Name them
6. Drw the electronic admittance spiral of REFLEX KLYSTRON
7. Draw the equivalent circuits of pin diode under (a0 Reverse bias and (b) Forward bias
8. Which two phase angle make the voltage and current on A valanche transmit time device to be out of phase by 180 degrees?
9. Why is the SLOT located a the center of the SLOTTED SECTION?
10 What are LOW VSWR and HIGH VSWR and name the method followed to measure HIGH VSWR?
PART -B (5 X 16 =80)
11 (i) Explain the method of measuring impedence at microwavr frequencies
(ii) Give the relationship of LOADED and UNLOADED Q of a cavity
12 (a) (i) Obtain the relationship of S parameters in terms of ABCD parameters
(ii) Find the S parameters of an ideal transformer of turns ratio 1:n
OR
(b) A certain two -port microwave junction can be represented by the following equivalent circuit. Determine the susceptance B and the turns ratio n of ideal transformer if the measurements give S11= -(1 + j )/3 +j ,S22 = 1-j/3 +j
13(a) (i) From the first principle ,derive the scatttering matrix of an ideal directional coupler. Hence or otherwise write down [s] matrix of HYBRID COUPLER and MAGIC - T
(ii) What is the value of DIRECTIVITY of an ideal DIRECTIONAL COUPLER ? why?
OR
(b) (i) An isolator, with a charecteristic impedence of 50 ohms has forward and reverse losses of 0.9 dB and 32 dB respectivily. Its input and output VSWR's are 1.09 and 1.16 respectivily when it is terminated by a 50 ohms load. Determine its S parameters. Assume zero phase components.
(ii) Explain how the inductances and capacitances can be varied using IRESES and SCREWS (posts)
14 (a) Derive the expression for the gain of a TWT
(b) Derive 'HULL CUT OFF' condition and 'HARTEE' condition of a cavity type mgnetron
15 (a) (i) Derive 'Manley Rowe Relations '.
(ii) Use the above relations to find the poer gain of an UP CONVERTER and a DOWN CONVERTER
OR
(b) Write in detail the principle mechanism of operation and the application of IMPATT diode.
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