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Microwave Engineering: Waveguides and Passive Devices
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Microwave Engineering: Waveguides and Passive Devices
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25 Questions

1. An air coaxial cable has attenuation of 0.022 and phase constant of 104.7, then the quality factor of a λ/2 short circuited resonator made out of this material is:
2. A circular cavity resonator is filled with a dielectric of 2.08 and is operating at 5GHz of frequency. Then the wave number is:
3. Inductance of an open circuited λ/2 transmission line is dependent on the characteristic impedance of the transmission line.
4. If the normalized admittance at a point on a transmission line to be matched is 1+j1.47. Then the normalized susceptance of the stub used for shunt stub matching is:
5. If the loss tangent of a rectangular waveguide is 0.0004, then Q due to dielectric loss is:
6. The expression for total reflection in the simplified form is given by:
7. For a load impedance of ZL=60-j80. Design of 2 single-stub shunt tuning networks to match this load to a 50Ω line is to be done. What is the normalized admittance obtained so as to plot it on smith chart?
8. The required length of the cavity resonator for l=1 mode (m=1, n=0) given that the wave number of the cavity resonator is 157.01 and the broader dimension of the waveguide is 4.755 cm:
9. The element of a Z matrix, Zij can be given in terms of voltage and current of a microwave network as:
10. The loss tangent for a circular cavity resonator is 0.0004.Then the unloaded Q due to dielectric loss is:
11. The total approximate reflection coefficient is a finite sum of reflection co-efficient of individual matching section of the matching network.
12. The propagation constant of TEmn mode of propagation for a cylindrical cavity resonator is:
13. Quality factor of a coaxial cable transmission line is independent of the medium between the wires of the transmission line.
14. For a one port network , the scattering parameter S₁₁ in terms of impedance parameter Z₁₁ is:
15. S₁₂=0.85-45⁰ and S₁₂=0.85 +45⁰ for a two port network. Then the two port network is:
16. The relation between voltage, current and admittance matrices of a microwave network is:
17. The mode of the circular cavity resonator used in frequency meters is:
18. The two adjustable parameters in single stub matching are distance'
19. A microstrip patch antenna has a width of 5.08mm and surface resistivity of 1.84*10-2. Then the attenuation due to conductor loss is:
20. In shunt stub matching, the key parameter used for matching is:
21. In the multiple reflections analysis method, the total reflection is:
22. The relation between voltage, current and impedance matrices of a microwave network is:
23. S parameters are expressed as a ratio of:
24. If the first and the third reflection coefficients of a matched line is 0.2 and 0.01, then the total reflection coefficient if quarter wave transformer is used for impedance matching is:
25. For a lossless network, the impedance and admittance matrices are:

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