Question

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Answer 1

Answer:

What are the advantages and applications of microwaves?

2. Derive and explain voltage and current relationship of a transmission line with

lumped element circuit.

3. Define and explain characteristic impedance, reflection coefficient, transmission

coefficient, standing wave, and SWR of microwave with equations.

4. Derive and explain the relation between standing wave ratio and reflection

coefficient.

5. A telephone line has R=6 Ω/km L=2.2 mH/km C=0.005 µf/km and G=0.05 mho/km.

Determine Z0, α, β at 1 kHz. If the line length is 100 km, determine the attenuation and phase

shift of the signal. Calculate phase velocity of the signal.

6. Derive and explain input impedance and admittance of transmission line also find

input impedance for S.C. load, O.C. load and for loss less line also find Max. Z

and Min. Z of Tx. Line and characteristics of line.

7. The load impedance ZL=38.8-j48.7 is connected to transmission line of Z0 =50 ,

find SWR, maximum and minimum resistance on the line.

8. Draw voltage standing wave pattern for different loads in a loss less line for ZL

=Z0, ZL=0, ZL =∞, ZL =+jx, ZL =-jx.

9. A 50 Ω lossless line connects a signal of 100 kHz to a load of 100 Ω. The load

power is 100 mW. (i) Calculate Refection coefficient, (ii) VSWR, (iii) Position of

first Vmin and Vmax, (iv) Vmin and Vmax and (v) Impedance at Vmax and Vmin.

10. Explain various impedance matching methods in transmission line like Quarter

wave transformer, single stub along with equation of location l and length l’ of

single stub.

11. A dipole antenna whose impedance is a 100 is to be matched at a frequency of

100 MHz with transmission line of Z0 = 600 by means of short circuited stub.

Determine the position and length of stub without smith chart.

12. Using Smith chart, find the SWR on a 150 Ω line when line is terminated in a (225

– j75) Ω impedance. Find nearest point to the load at which quarter-wave

transformer may be connected to match this load to the line and calculate the Z’

0

of the line from which transformer must be made.

13. For Zl = 450-j600 at 10 MHz is connected to a 300 transmission line. Calculate the