将上升沿和下降沿均不同的时域脉冲波形馈入到轴向模式螺旋天线中，得到不同的辐射场情况。
Several different time domain waves with different ascending time and degressive time are fed into axial-mode helical antennas, and different radiated fields are gained.
数据速率的提高导致数字信号的上升沿和下降沿时间不断缩短、脉宽变窄和周期减小，从而使数字信号在传输过程中出现毛刺、扭曲和扩展等畸变现象。
At high speeds, logic signals often appear hairy, jagged and distorted because of fast signal rise and fall time. We must avoid these phenomena in the high-speed digital circuit system.
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