基于射频电路的微波加热系统中负载变量关系研究
A Study of the Relationship among Load Variables in Microwave Heating System Based on Radio Frequency Circuits
张敖放 1杨佳椿1
作者信息
- 1. 北京航天试验技术研究所,北京 100074
- 折叠
摘要
本文对基于射频电路驱动微带天线加热烟草的过程中,负载变化引起的调频电压、输出频率、射频电流等变量变化的关系进行了研究.通过修改射频驱动电路程序的调频电压,以 1min为步长,测量了微波加热0～4min内的电压、射频频率和电流.通过分析数据可知:射频输出频率随着调频电压的增加逐渐增大;射频电流随着调频电压的增大而逐渐减小;针对本文中心频率为 2.7GHz的微带天线,当调频电压位于大约 2.45V时,输出的射频频率在 2.66GHz至 2.74GHz范围内;对烟草介质进行微波加热时,加热初期的烟草负载大导致电流短暂增大,随后电流稳定减小;使用HFSS软件对微带天线进行仿真,在S11<-10dB时天线能够正常工作,4min内加热烟草介质的功耗约为 0.23682 瓦时.研究为依据负载变量关系对微波加热效果的优化提供了依据.
Abstract
The relationship between changes in variables such as FM voltage,output frequency,and RF current caused by load changes in the process of driving a microstrip antenna to heat tobacco based on a radio frequency circuit was investigated.By modifying the FM voltage of the RF driving circuit program,the voltage,RF frequency and current were measured in the microwave heating from 0min to 4min in 1min steps.Analyzing the data,it can be seen that:the RF output frequency increases gradually with the increase of the FM voltage;the RF current decreases gradually with the increase of the FM voltage;for the microstrip antenna with a center frequency of 2.7 GHz in this paper,when the FM voltage is located at about 2.45 V,the output RF frequency is in the range of 2.66 GHz to 2.74 GHz;when the mi-crowave heating of tobacco media,the large tobacco load in the early stage of heating leads to a brief increase in current,and then the cur-rent decreases steadily;using the HFSS software to simulate the microstrip antenna,the antenna is able to work normally when S11<-10dB,and the power consumption of heating the tobacco medium is about 0.23682 watt-hours in 4 minutes.The study provides a basis for the optimization of microwave heating effect based on the load variable relationship.
关键词
射频/频率/调频电压/电流/微波加热Key words
RF/FM voltage/Frequency/Current/Microwave heating引用本文复制引用
出版年
2024
NETL
NSTL
万方数据