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B.E/B.TECH DEGREE EXAMINATION NOV / DEC 2016

Seventh / 07th Semester

Department of ECE

EC6701 RF and Microwave Engineering

Nov Dec 2016 Important Questions

(Regulation 2013)

16 Marks Important Questions asked in previous years university examinations.

1. The S-parameters of a two-port network are given by S11 = 0.2∟900 S22=0.2∟900 S12=0.5∟900 S21=0.5∟00 (a)Determine whether the network is lossy or not. (b) Is the network symmetrical and reciprocal, (c) Find the insertion loss of network. (d) Find the return loss at Port 1 when port 2 is short circuited.

2. State and verify the symmetry property of the reciprocal networks

3. Explain with S matrix concept prove the following properties(a)Symmetry (b) Unitary (c) Zero(d) Phase shift

4. Explain the following: (a) Impedance matching networks. (b) Microstripline matching networks

5. Discuss the importance of low and high frequency parameters of RF two port networks

6. Verify the Loss less & Reciprocity properties of two port network using scattering matrix

7. Design all possible configurations of discrete two element matching network that match the source impedance ZS= 50 + j25 Î© to the load ZL= 25 – j15 Î©. Assume the characteristic impedance of 75 Î© at operating frequency 2 GHz

8. Explain (a) Operating power gain (b) Available power gain (c) Noise figure

9. Derive the transducer power gain for a transistor amplifier

10. Design LC network to match source impedance Zs = (50+j25) Î© to the load ZL = (25-j50) Î©. Assume ZO = 50 Î©, f= 2GHZ. Use smith chart

11. Explain (a) Magic Tee (b) Directional coupler(c) Circulator microwave passive devices operation(d) Isolator microwave passive devices operation (e) Gyrator (f) Two hole Directional Coupler

12. With the help of two-valley, explain how negative resistance can be created in Gunn diode. Explain its applications

13. What are avalanche transit time devices? Explain the operation and construction of IMPATT diode

14. Explain the properties of E-plane Tee? Derive the expression of scattering matrix for Directional coupler

15. Derive the S- parameters of a Directional Coupler. Explain its application in detail under the construction of a circulator

16. Explain the working principle of Reflex Klystron and derive the expression of Bunching parameter

17. Explain how TWT is used as an microwave oscillator. Mention its application

18. explain how the power of a microwave generator can be measured

19. Derive the Hull cut-off magnetic and voltage equations

20. Explain the measurement of high VSWR with the help of block diagram

B.E/B.TECH DEGREE EXAMINATION NOV / DEC 2016

Seventh / 07th Semester

Department of ECE

EC6701 RF and Microwave Engineering

Nov Dec 2016 Important Questions

(Regulation 2013)

16 Marks Important Questions asked in previous years university examinations.

1. The S-parameters of a two-port network are given by S11 = 0.2∟900 S22=0.2∟900 S12=0.5∟900 S21=0.5∟00 (a)Determine whether the network is lossy or not. (b) Is the network symmetrical and reciprocal, (c) Find the insertion loss of network. (d) Find the return loss at Port 1 when port 2 is short circuited.

2. State and verify the symmetry property of the reciprocal networks

3. Explain with S matrix concept prove the following properties(a)Symmetry (b) Unitary (c) Zero(d) Phase shift

4. Explain the following: (a) Impedance matching networks. (b) Microstripline matching networks

5. Discuss the importance of low and high frequency parameters of RF two port networks

6. Verify the Loss less & Reciprocity properties of two port network using scattering matrix

7. Design all possible configurations of discrete two element matching network that match the source impedance ZS= 50 + j25 Î© to the load ZL= 25 – j15 Î©. Assume the characteristic impedance of 75 Î© at operating frequency 2 GHz

8. Explain (a) Operating power gain (b) Available power gain (c) Noise figure

9. Derive the transducer power gain for a transistor amplifier

10. Design LC network to match source impedance Zs = (50+j25) Î© to the load ZL = (25-j50) Î©. Assume ZO = 50 Î©, f= 2GHZ. Use smith chart

11. Explain (a) Magic Tee (b) Directional coupler(c) Circulator microwave passive devices operation(d) Isolator microwave passive devices operation (e) Gyrator (f) Two hole Directional Coupler

12. With the help of two-valley, explain how negative resistance can be created in Gunn diode. Explain its applications

13. What are avalanche transit time devices? Explain the operation and construction of IMPATT diode

14. Explain the properties of E-plane Tee? Derive the expression of scattering matrix for Directional coupler

15. Derive the S- parameters of a Directional Coupler. Explain its application in detail under the construction of a circulator

16. Explain the working principle of Reflex Klystron and derive the expression of Bunching parameter

17. Explain how TWT is used as an microwave oscillator. Mention its application

18. explain how the power of a microwave generator can be measured

19. Derive the Hull cut-off magnetic and voltage equations

20. Explain the measurement of high VSWR with the help of block diagram

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