一种紧凑型大功率微波固态源

传统的微波源主要由行波管、磁控管、返波管等电真空器件实现,但因其工作电压高、功耗大、体积大,导致在使用安全性、利用效率和便携性等方面存在不足。而微波固态源由于具有效率高、谐波抑制性能好、稳定性高等优点,正逐步替代传统微波源,有着很好的发展空间。设计了一种紧凑型大功率微波固态源,采用锁相环作为信源,通过三级功放级联对微波信号进行逐级放大,最终输出频率为915 MHz、功率为300 W 的微波信号。测试结果表明该固态源的工作效率≥70%,二次谐波抑制≤-40 dBc,三次谐波抑制≤-50 dBc。该设计在微波加热和解冻等方面具有很好的应用前景。

A Compact High-Power Microwave Solid-State Source

The traditional microwave source is mainly realized by electric vacuum devices such as TWT, magnetron, and BWT, etc. The high voltage, large power consumption and large volume of these electric vacuum devices result in problems of safety, efficiency, and portability. Microwave solid-state source is gradually replacing the traditional microwave source because of its high efficiency, good harmonic suppression performance, high stability and so on. In this paper, a compact high-power microwave solid-state source is designed, which uses the phase-locked loop as the signal source, the design amplifies the microwave signal step by step by the three-stage power amplifier, and achieves the output microwave signal with the power level of 300 W at 915 MHz. The measured results show that the working efficiency is larger than 70%, the second and the third harmonic suppressions are better than -40 dBc and -50 dBc respectively. The design has a good application prospect in industrial microwave applications such as microwave heating and thawing.