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Electronics and Communication Engineering - Microwave Communication

Exercise : Microwave Communication - Section 2
31.
Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z0?
line open circuited at far end
line terminated in Z0
line short circuited at far end
line terminated in inductance
Answer: Option
Explanation:

If ZL is load impedance and Z0 is characteristic impedance.

Input impedance =. If ZL = Z0 the input impedance = Z0.

32.
In microwave system the function of mode filter is
to suppress modes with lower cut off frequencies
to suppress modes with higher cut off frequencies
to change mode of wave transmission
both (b) and (c)
Answer: Option
Explanation:

Mode filter suppress modes with lower cutoff frequencies.

33.
For the strip line in the given figure the capacitance per unit length =
Answer: Option
Explanation:

frads/unit length.

34.
The total field developed by an antenna array at a distant point is
phasor sum of fields produced by individual antennas of the array
algebraic sum of fields produced by individual antennas of the array
either (a) or (b) depending on type of array
neither (a) nor (b)
Answer: Option
Explanation:

Since field is a phasor quantity we have to take phasor sum.

35.
High speed logic circuits use
pulses with very small width
pulses with very large width
pulses whose width is neither small nor large
either (b) or (c)
Answer: Option
Explanation:

High speed means time period is small. Therefore pulses should also have small width.

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