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--- cert_exam:tech_radio_op_1:b:freq:h-parabola_antenna_strength [2019/12/31 10:48] – 作成 fu
+++ cert_exam:tech_radio_op_1:b:freq:h-parabola_antenna_strength [2020/01/01 00:43] (current) – fu
@@ Line 1: / Line 1: @@
 ======パラボラアンテナ-電界強度======
+パラボラアンテナの絶対利得Gは、開口面積をA、波長を$\lambda$,開口効率を$\eta$とすると
+\[
+G= \frac{4 \pi \eta A}{\lambda^2}
+\]
-  *
+距離dの地点での、電界強度Eは,絶対利得をG、送信電力をPとすると
+\[
+E= \frac{\sqrt{30 G P}}{d}
+\]
 ===== 出題履歴 =====