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Virual Oral Question and Answer
IEEE/ICACT20210172 Question.3
Questioner: lijingwei10@huawei.com    2021-02-10 오후 2:47:38 		IEEE/ICACT20210172 Answer.3
Answer by Auhor tetsuya-iye@kke.co.jp   2021-02-10 오후 2:47:38
Thank you for you presentation.In your experiment, the length between the rotating table and horn antenna is set to 3 m, my question is why 3 m is used, and how the length affects the amplitute of the array pattern? Thank you for your question. Since we used the carrier frequency of 28 GHz in the millimeter-wave band, radio waves suffer severe path loss. This makes the communication reach distance short and it becomes difficult to reach further than several tens of meters unless we use massive-element antenna array or increase the power supply. On the other hand, the distance should be more than far field distance 2D^2/λ (= 0.5 m) in order to measure the array pattern properly. Thus we chose 3 m as the distance between the table and horn antenna.

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