依据阻抗匹配原理与电磁波传播规律，设计了具有阻抗渐变结构的双层吸波材料。
According to the resistance matching principle and electromagnetic spreading regulation, double-layer absorbing materials with resistance gradual changing structure were designed.
分析了锁相环的基本原理和实现，并对射频电路设计理论和阻抗匹配问题进行了探究。
Analyzing the basic theory and development of PLL, and studying the design theory and impedance match problem of experimental circuit board.
介绍了阻抗匹配设计原理。
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