1. 给定器件设计为在特定限制范围内工作的频率范围。 2. 半功率点之间的差异，即功率下降到峰值功率一半（3dB）的频率。 3.
where is the power at the frequency and is the maximum power. It is the width of a boxcar with the same total power and the same peak power.
4. The rate at which a computer resource can carry (accept or deliver) data. Usually expressed in bytes per second or bits per second.