摘要:
本文提出一个用增加电极长度来提高微波场效应器件输出功率的新方法。从一个具有分布参数的电极系统模型出发,求得一组描述电极系统上电流电压与半导体中的电荷流的相互作用方程,这些基本方程以耦合模的形式表示。本文讨论了弱耦合情况下的行波放大特性。在同步工作时,增益具有极宽频特性,波幅沿漏极线上线性增长,功率输出正比于电极的有源长度,并具有宽频功率合成特性。在异步工作时,增益变为低频窄带特性。当系统的电磁耦合存在时,系统中的波幅沿线路近似地按指数增长,并具有高增益特性。在合适的电极系统设计下,行波场效应器件是可以实现大功率输出,长寿命工作的。
Abstract:
A new method of increasing the power capability of microwave FETs by increas-ing the electrode length is proposed. An analytical model with distributed parameters of the structure is derived. A set of equations deseribing the mutual interaetion of voltage and eurrent on the electrodes with the charge current in the active layer of FET is found. This set of basie equations is transformed into coupled mode form. When the electromagnetic coupling is weak enough and in synchronous case, the wave amplification with ultra wide bandwidth occurs. The wave amplitude along the drain electrode system increases linearly with distance, the power output is directly proportional to the active drain electrode length. A broadband power combining exists. In nonsynchronous case, wave amplification shows only a narrow bandwidth. When the electromagnetic coupling cannot be neglected, the wave amplitude grows exponentially along the electrode length, indicating a high gain characteristic. the TW FET can be realized by proper design of the electrode system, and high power output with long life operation results.
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