Microwave Engineering Nr320403

NR

Code No: NR320403

III B.Tech II Semester Supplementary Examinations, Apr/May 2006 MICROWAVE ENGINEERING (Electronics & Communication Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Mention different Microwave Regions, Band designations and the corresponding services of electromagnetic waves. (b) Mention the applications of Microwaves.

[8+8]

2. (a) How is bunching achieved in a cavity magnetron. Explain the phase focusing effect. (b) Discuss types of magnetrons and list the important applications.

[8+8]

3. (a) Give the classification of solid state MW devices along with examples? (b) Why conventional tubes and solid state devices can not be used at microwave frequencies? [8+8] 4. Describe a typical helium cooled ruby maser construction, operation, performance characteristics and applications. [16] 5. (a) Derive a general expression for the resonant frequencies of a rectangular waveguide cavity. (b) List out the microwave applications cavity resonators.

[10+6]

6. Explain the operating principles and constructional details of a Faraday rotation isolator. Where does one use an isolator in microwave networks? Obtain the Smatrix for an ideal isolator. [16] 7. (a) Derive the relationship between guide wavelength, cut-off wavelength and free space wavelength. (b) Give the experimental procedure to verify the above relationship.

[8+8]

8. (a) Explain the various techniques involved in the fabrication of a Microwave integrated circuit. (b) When a Microwave signal is propagated through a Coplanar stripline, explain the various modes formed in the stripline. [8+8] ?????

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