Electronics and Communication Engineering - Microwave Communication

11. 

The two terms used to describe performance of a directional coupler are

A. coupling and directivity
B. gain and coupling
C. gain and directivity
D. gain and isolation

Answer: Option A

Explanation:

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12. 

The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about

A. 10
B. 100
C. 500
D. 1500

Answer: Option D

Explanation:

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13. 

Consider the following statements

  1. Gunn diode can be used in combinational logic circuits.
  2. Gunn diode can be used in sequential logic circuits.
  3. Both Gunn diode and GaAs Mesfet can be used in logic circuits.
Which of the above statements are correct?

A. 1, 2, and 3
B. 1 and 2 only
C. 2 and 3 only
D. 1 and 3 only

Answer: Option A

Explanation:

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14. 

In the given figure shows the equivalent circuit of a magic tee. If all ports are matched

A. nE = nH = 2
B. nE = nH = 0.707
C. nE = 2, nH = 0.707
D. nH = 0.707, nH = 2

Answer: Option A

Explanation:

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15. 

Assertion (A): Microstrip is very commonly used in microwave integrated circuits.

Reason (R): Microstrip has an easy access to the top-surface so that active and passive discrete components can be easily mounted.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Answer: Option A

Explanation:

A Microstrip line has a single dielectric substratc with ground plane on one side and a strip on the other face.

Its special feature is easy access to top surface so that minor adjustments can be made after circuit fabrication.

The high dielectric constant of the substrate reduces guide wavelength and circuit dimensions.

A microstrip line is the most commomly used transmission structure for microwave integrated circuits.