Topic: Electronics Engineering
The beamwidth of a reflector antenna of diameter $=70$ cm at 30 GHz is
- A. 3.7 degree
- B. 0.5 degree
- C. 1.1 degree
- D. 1 degree
Answer: D. 1 degree
Explanation: Given, $d=70~cm$ $f=30~GHz$
$\lambda=\frac{3\times10^{8}}{30\times10^{9}}\times100~cm=1~cm.$
Beamwidth (0) $=\frac{K\lambda}{d}=\frac{70\times1}{70}=1$ ($\cdot\cdot K=70$)