The radiation resistance of a doublet antenna of length dl is proportional to ?

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Question
The radiation resistance of a doublet antenna of length dl is proportional to
Options
A. ? l
B. (? l)²
C. (? l)³
D. (? l)⁰⁵

Correct Answer

(? l)²

Microwave Communication problems

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2. Assertion (A): In TE₁₀ mode the cutoff frequency of rectangular waveguide is where a is the broad dimension and c is velocity of light.
Reason (R): TE₁₀ mode is the dominant mode in rectangular waveguide.
Options
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

3. A TR (transmitter receiver) tube has
Options
A. low loss for low power signals and high
B. high loss for low power signals and low loss for high level signal
C. low loss for both low level and high level signals
D. high loss for both low level and high level signals

6. Assertion (A): A small section of high impedance line is equivalent to a series inductance.
Reason (R): A small section of a low impedance line is equivalent to a series resistance.
Options
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

7. When duct propagation exists
Options
A. the line of sight and diffraction. Zone concepts are payable
B. the line of sight and diffraction zone concepts are not applicable
C. line of sight concept is applicable but diffraction zone concept is applicable
D. diffraction zone concept is not applicable but line of sight concept is not applicable

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