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EC2403

RF &MICROWAVE ENGINEERING

IMPORTANT 16 MARK QUESTIONS UNIT -1 TWO PORT RF NETWORK CIRCUIT REPRESENTATION

1. List and Explain properties of S – Matrix 2. Give the [ABCD] matrix for a two port network and derive its matrix[Nov/Dec-12] 3. The S parameters of a two port network are given by [Nov/Dec - 11] S11 = 0.2 0 : S12 = 0.1 0 S21 = 0.6 90 : S22 = 0.6 90 Prove that the network is reciprocal but not lossless Find the return loss at port 1 when pot 2 is short circuited. 4. Find the Z parameters Z11 and Z12 of the two port T network shown in fig [Nov/Dec13] 5. Formulate a scattering matrix for N port microwave network[Nov/Dec-12]

Unit -2 RF – TRANSISTOR AMPLFIER DESIGN AND MATCHING NETWORKS 1. Explain the impedance matching network [Nov/Dec -2011] 2. Explain the micro strip matching network [Nov/Dec -2011] 3. Discuss the smith chart approach to design the L-section and T- section matching networks [May/June -13] 4. Microwave amplifier is characterized by its s parameters. Derive equations for power gain, available gain and transducer gain.

[NOV/DEC -12]

5. Explain conditional and un conditional stability UNIT – 3 MICROWAVE PASSIVE COMPONENTS 1. Derive the expression for S matrix representation of multi-port network (16). 2. State and prove the properties of S parameters (16) 3. (a) Explain symmetrical Z and Y matrices for reciprocal network. (8) (b) Comparison between [S], [Z] and [Y] matrices. (8) SCE

126

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EC2403

RF &MICROWAVE ENGINEERING

4. Two transmission lines of characteristic impedance Z1 and Z2 are joined at plane pp’. Express S

parameter in terms of impedances. (16)

5. Derive the S-matrices for E-plane and H-plane tee. (16) 6. Derive the S-matrices for Magic tee. (16) 7. From the first principles Derive the S-matrices for Directional coupler. (16) 8. (a) Explain about rat race circuit. (8) (b) Explain the concept of waveguide corners bends and twists. (8) UNIT – 4 MICROWAVE SEMICONDUCTOR DEVICES 1. Explain in detail about Gunn diodes and modes of operation. (16) 2. Explain the working behind READ Diode. (16) 3. Explain in detail about BARITT diodes and its applications. (16) 4. Describe the conceptual view of IMPATT diodes. (16) 5. Describe the conceptual view of VCO parametric amplifier. (16) 6. Describe in detail about microwave amplification and generation.(16) 7.(i) Explain in detail about RWH theory (8) (ii) Explain the concept on two valley modal theory in negative resistance amplifier (8) 8. Derive an output expression for nonlinear reactance and Manley Rowe power relation. (16) 9. With the help of physical description, explain the working of TRAPATT diode. (16) UNIT –5: MICROWAVE TUBES AND MEASUREMENTS 1. With neat circuit diagrams and relevant equations, explain the velocity modulation process and bunching in a klystron amplifier. (16) 2. Derive the equation for power output and efficiency of two cavities and four cavity klystron amplifiers. (16) 3. With neat diagrams and relevant equations, explain about helix traveling wave tube. (16) 4. With neat diagram, explain about Magnetron oscillator. (16) 5. Explain about the convection current, axial electric field and wave modes of TWT. (16)

SCE

127

ECE

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RF &MICROWAVE ENGINEERING

6 Explain in detail the measurement of VSWR. (8) 7. Write a brief note on insertion loss and attenuation measurements 8. Explain network analyzer and its uses. (16) 9. With experimental setup explain in detail about the impedance measurements. (16) 10. Explain in detail on the measurement of scattering parameters. (8) 11. With neat block diagram explain the return loss measurement using directional coupler

SCE

(Reflectometer).(8)

128

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UNIVERSITY 16 MARK QUESTION UNIT -1 TWO PORT RF NETWORK CIRCUIT REPRESENTATION List and Explain properties of S – Matrix

1. Give the [ABCD] matrix for a two port network and derive its matrix[Nov/Dec-12] 2. The S parameters of a two port network are given by [Nov/Dec - 11] S11 = 0.2 0 : S12 = 0.1 0 S21 = 0.6 90 : S22 = 0.6 90 Prove that the network is reciprocal but not lossless Find the return loss at port 1 when pot 2 is short circuited. 3. Find the Z parameters Z11 and Z12 of the two port T network shown in fig [Nov/Dec13] 4. Formulate a scattering matrix for N port microwave network[Nov/Dec-12]

5. Unit -2 RF – TRANSISTOR AMPLFIER DESIGN AND MATCHING NETWORKS 6. Explain the impedance matching network [Nov/Dec -2011] 7. Explain the micro strip matching network [Nov/Dec -2011] 8. Discuss the smith chart approach to design the L-section and T- section matching networks [May/June -13] 9. Microwave amplifier is characterized by its s parameters. Derive equations for power gain, available gain and transducer gain.

[NOV/DEC -12]

10. Explain conditional and un conditional stability UNIT – 3 MICROWAVE PASSIVE COMPONENTS 1. Discuss Structure and principle of operation of Isolator [NOV/DEC- 2011, 2012,2013] 2. Discuss Structure and priviple of operation of circulator [NOV/DEC- 2011, 2012,2013,14] SCE

129

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3. Explain how directional coupler can be used to measure the reflected power [nov/dec 2012, Nov/ Dec -13,Apr/May -15] 4. Explain the properties of H plan tee and give reasons and why its called shunt tee [NOV /DEC 2012] 5. Derive the equation for S matrix of magic TEE [NOV /DEC 2012, May / June -13, 14, Nov/ Dec -13] 6. Explain the properties of E plan Tee ? derive the expression for scattering matrix [May/june -2013,Nov/Dec -14]

UNIT – 4 MICROWAVE SEMICONDUCTOR DEVICES 1. With neat diagram , explain the working principle of Gunn diode mention its application [Nov/Dec 2011,2012,2013,14,May/June – 13,14] 2. Draw the construction and explain the working of IMPATT diode [Nov/Dec 12,May/June -13] 3. Explain the principle operation of tunnel diode and TRAPATT device [Nov /Dec -12] 4. Discuss

the

working

principles

of

Parametric

Amplifier

and

mention

application[Nov/Dec - 14] 5. Explain the Tunneling action in tunnel diode [NOV/DEC -2012] 6. UNIT –5: MICROWAVE TUBES AND MEASUREMENTS 1. Explain the principle of microwave power measurements [Nov/Dec -11] 2. Describe how the frequency of a given microwave source can be measured [Nov/Dec12] 3. Explain how low VSWR can be measured using microwave bench [Nov/Dec - 2012] 4. Explain the procedure to measure the impeadance of load[May/June-14] 5. Explain the operation of teo cavity klystron amplifier and compare it with traveling wave tubes [Nov/Dec-11]

SCE

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6. Explain the working principle of reflex klystron and derive the expression of bunching parameters [Nov/ Dec -2013] 7. Explain the Π mode of operation of magnetron mention few high frequency limitation [Apr/May -2015]

SCE

131

ECE

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EC2403 RF and Microwave Engineering 123- By EasyEngineering ...

Derive the equation for power output and efficiency of two cavities and four cavity klystron. amplifiers. (16). 3. With neat diagrams and relevant equations, explain about helix traveling wave tube. (16). 4. With neat diagram, explain about Magnetron oscillator. (16). 5. Explain about the convection current, axial electric field and ...

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