一种频率和功率可调的固态微波功率源

Solid-state Microwave Power Source with Adjustable Frequency and Power

现有大功率无线能量传输系统多采用磁控管作为射频源,虽输出功率高,但带宽较窄且质量重,不利于系统集成,为此设计了一套功率和频率可调的固态微波功率源。该微波功率源采用具有宽带特性的放大器件和反馈调节方式,获得了较宽的带宽和输出功率动态范围。系统集成在28 cm×19 cm×10 cm的机箱中,具有体积小、可靠性高、散热性能良好和重量轻等优点,在无线能量传输/环境射频能量收集(模拟环境中射频能量产生设备,如基站、WIFI等)系统中具有很强的工程应用价值。在室温环境下,测试结果表明该固态微波功率源频率可调范围为0.7~2.8 GHz,频率调节步进为1 MHz,最大频率偏移量<0.3 MHz;功率可调范围为20.0~39.5 dBm,输出功率最大误差为±0.5 dB。此设计方法为高功率微波功率源研究与设计提供了一定指导。

The magnetron is used by most of the existing high-power wireless power transfer(WPT)systems as radio frequency(RF)power supply.However,its narrow bandwidth and big mass are not conducive to system integration despite its high output power.To solve this problem,a solid-state microwave power source(MPS)with adjustable power and frequency was designed,which realized a wide bandwidth range and a wide output power range by using broadband amplifiers and feedback regulation.The system was integrated into a box with a size of 28 cm×19 cm×10 cm,and it had advantages such as a small volume,high reliability,a good heat dispersion performance and a small mass,showing its engineering application value to systems of WPT or RF energy harvesting in the environment(simulating the RF energy generation equipment in the environment,such as a base station and WIFI).Finally,the measurement results at room temperature show that the solid-state MPS designed had an adjustable frequency range of 0.7-2.8 GHz,with a frequency step of 1 MHz and a maximum frequency offset less than 0.3 MHz.In addition,it had an adjustable power range of 20.0-39.5 dBm,with a maximum output power error of±0.5 dB.The design method proposed provides guidance for the study and design of highpower MPSs.