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Which of the following is not a concern for antenna tradeoff?

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Which of the following is not a concern for antenna tradeoff?

(a) RF access

(b) Calibration

(c) Phase noise

(d) RF MEMS

I had been asked this question by my school principal while I was bunking the class.

I'm obligated to ask this question of Antenna Tradeoffs topic in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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The correct answer is (d) RF MEMS

To explain I would say: RF access, antenna calibration, phase noise are some parameters which influence antenna tradeoffs. The antenna establishes the available RF band and is responsible for the directional properties of the system.

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