Electronics and Communication Engineering - Microwave Communication

Exercise :: Microwave Communication - Section 4

The domain mode in rectangular waveguide is

A.	TE₀₁
B.	TE₀₂
C.	TE₁₀
D.	TM₁₁

Answer: Option C

Explanation:

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The reverse voltage applied to a varactor diode

A.	is less than avalanche breakdown voltage
B.	is more than avalanche breakdown voltage
C.	may be more or less than a avalanche breakdown voltage
D.	is very high as compared to avalanche breakdown voltage

Answer: Option A

Explanation:

The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.

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To ensure that only dominant mode TE₁₀ is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are

A.	about 25% above f_c for TE₁₀ and 5% below f_c for TE₂₀ mode respectively
B.	about 50% above f_c for TE₁₀ and 25% below f_c for TE₂₀ mode respectively
C.	about 25% above f_c for TE₁₀ and 25% below f_c for TE₂₀ mode respectively
D.	none of the above