Microwave Theory And Techniques

1. Describe the differences between Isolator and circulator.

2. List the properties of the scattering matrix for a lossless junction.

3. Why is the H-plane T junction called a current junction?

4. Why are TEM waves not propagated through a waveguide?

5. Express the characteristics of a VSWR meter.

6. What is the need for matching networks?

7. Write the applications of a PIN diode.

8. Draw the diagram of a magic tee.

9. What are the five parameters of an antenna?

10. What is a stripline?

1. Draw the field patterns of the dominant mode in a rectangular waveguide.

2. Explain the Gunn Effect. Mention various modes of the Gunn diode and explain them in detail.

3. How is amplification achieved in a TWT amplifier?

4. What is a spectrum analyzer? List the types of spectrum analyzer and applications of it.

5. Calculate the SWR of a transmission system operating at 10 GHz. Assume TE10 wave transmission inside a waveguide of dimensions a = 4 cm, b = 2.5 cm. The distance measured between two successive minimum power points = 1 cm on a slotted line.

6. Draw the block diagram of a network analyzer and explain the function of each block.

7. How are microwave measurements different from low frequency measurements?

1. Discuss an arrangement to measure low microwave power within the 1 to 10 mW range.

2. Justify and describe how a microwave filter is designed using the insertion loss method.

3. A TWT operates with the following parameters: Vb = 2.5 kV, Ib = 25 mA, Z0 = 10 Ω circuit impedance, length N = 50, f = given operating frequency. Find the gain parameter, power gain and all four propagation constants.

4. Explain the principle of operation of an IMPATT diode with a suitable diagram and write down the advantages and uses of it.

5. What are the advantages and disadvantages of monolithic microwave ICs? A reciprocal two-port microwave device has a VSWR of 1.5 and an insertion loss of 2 dB. Find the magnitudes of the S-parameters for the device.