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The increase in the bandwidth of the antenna causes the thermal noise power to ______

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The increase in the bandwidth of the antenna causes the thermal noise power to ______

(a) decrease linearly

(b) increase linearly

(c) increase exponentially

(d) decrease exponentially

This question was addressed to me during a job interview.

My doubt stems from Antenna Tradeoffs topic in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio

1 Answer

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The correct choice is (b) increase linearly

The best I can explain: Wider bandwidth results in increase of noise which reduces the value of SNR, affecting the performance negatively. Filtering of antenna channels according to subscriber signals can give better performance.

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