Microwave Devices
Answer all the following questions. Be honest to yourself as God is watching us.
- 1.Why do you choose to use waveguide?
- A.
To replace the free space medium microwave propagation
- B.
To allow the wave to travel down the device smoothly
- C.
To make full use of the medium in order to achieve efficient transmission
- D.
To allow the microwave energy to be guided in a certain transmission medium
- E.
To minimize losses dissipated in the free space
- 2.What is the main limitation of using the waveguide?
- A.
Dimensions of the waveguide
- B.
Frequency of operation
- C.
Aperture of the waveguide
- D.
Propagation mode of operation
- E.
Selection of materials
- 3.Which is determining the orientation of the electric field at the aperture of the waveguide?
- A.
The frequency of operation plays an important factor in orientating the electric field distribution
- B.
The dimensions of the waveguide enable the selection of the frequency of operation
- C.
The mode of operation influences the direction of electric field
- D.
The cut-off frequency of the waveguide contributes to the change in the microwave propagation
- E.
Non of the above
- 4.Which of the following best describes the operation of microwave tubes?
- A.
It is similar with the opreration of electronic tubes
- B.
Microwva tubes consist of klystrons, magnetrons and photons
- C.
Microwave tubes can be divided into klystrons, magnetrons and travelling wave tubes
- D.
Microwave tubes use electron beam which allows interation between space charge waves and electromagnetic fields
- E.
Microwave tubes are linear beam which can also be recognized as o-type tubes which have similar direction between electric and magnetic fields
- 5.Briefly describe the steps that are essential to be taken into account in designing a waveguide with TE 10 mode operation (10 marks)
- 6.-You have been assigned by your Senior Manager to design a waveguide operating in the x-band frequency range. You found that the dimensions are not fitted for microwave measurements. Discuss factors of the problem and suggest options to get the problems sorted out.
- 7.Which of the following factor clearly affects the efficiency of an antenna design?
- A.
Propagation constant
- B.
Impedance matching
- C.
Gain
- D.
Dielectric loss
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