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If the length of the dipole decreases, then the radiation resistance will________

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If the length of the dipole decreases, then the radiation resistance will________

(a) increase

(b) decrease

(c) depends on current distribution

(d) not change

I got this question in final exam.

My doubt stems from Radiation Resistance in chapter Antenna Parameters of Antennas

1 Answer

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Best answer
The correct answer is (b) decrease

Easy explanation: Since the radiation resistance of a Hertzian dipole is R=80π^2 \((\frac{l}{\lambda})^2\), the radiation resistance will decrease as the length of the dipole decreases. It is directly proportional to the square of the length of the dipole.

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