A colloquial term for the 700–900 MHz frequency band used in Japanese mobile communications. Because lower-frequency radio waves diffract more easily and can reach behind obstacles, this band provides superior coverage indoors and underground, earning it the prestigious "platinum" label.

Past questions testing this term · 1 questions

• 2025r07 #71携帯電話で用いられる電波に関する次の記述中の a, b に入れる字句の適切な組合せはどれか。 電波には，周波数が [a] ほど回り込みやすくなり障害物の裏にも届…