The snag, however, has been that while efficiency is good at close contact, it can drop to zero at even a few millimetres from the transmitter.
一个意料外的障碍是，尽管在相当近的距离内传输效率很高，可一旦和传输器的距离达到几毫米，效率就会跌到零。
Linearization and efficiency enhancement techniques of power amplifier can be adopted to improve the linearity and power efficiency of the transmitter.
于是功率放大器的线性化以及提高效率的技术被采用来改善发射器的线性度和效率。
Designing a high linearity and high power efficiency wireless transmitter is a big challenge due to the nonlinear characteristic of the power amplifier.
而功率放大器又具有非线性特性，因此要设计高效率又高线性度的无线发射机便成了一个相当困难的挑战。
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