摘要
为了解带缝腔体内耦合场分布特性,利用时域有限差分方法对微波脉冲与带缝嵌套矩形腔体系统(系统1)和带缝嵌套圆柱形腔体系统(系统2)的耦合过程进行了数值计算。计算表明两系统的外、内孔缝附近均存在场增强现象;两系统耦合过程存在相同的外孔缝耦合主脉冲、外孔缝场增强因子和脉宽展开现象,其内部腔体(Q2)中心点耦合场强峰值接近相等。相比各自的外部腔体(Q1)以及相同入射脉冲下的孔缝、同体积单层腔体内的耦合场强,两嵌套腔体的Q2内耦合场要弱。对两个系统的共振峰、共振频率点以及最大耦合函数曲线的研究结果表明,系统2在耦合过程中的腔体调制现象更明显,且在两种系统中,内孔缝使Q2内耦合波基于Q1内耦合波平均衰减约10 dB。
The finite-difference time-domain method （FDTD） was adopted to investigate linear coupling processes of microwave pulse into the nested rectangular cavities （ system 1 ） and the nested cylindrical cavities （ system 2 ） with same narrow rectangular slots. The results show that the phenomenon of field enhancement appears near the outer slot and the inner slot on the nested rectangular cavities and the nested cylindrical cavities. These two coupling processes both have same main coupling pulse, field enhancement coefficient, and phenomenon of pulse width stretch near the outer slots on the outer cavities. Peak values of coupling fields at the centres of the inner cavities （ Q2 ） are equal approximately. Compared with the outer cavities （ Q1 ） and the single cavities that have same narrow rectangular slot and volume of the nested cavities under same incident pulse, the coupling wave inside the inner cavi- ties are weaker. Then, the coupling resonant peaks, the coupling resonant frequencies and the maximum coupling function curves of the nested rectangular cavities and the nested cylindrical cavities with same narrow rectangular slots are calculated, and it is concluded that the phenomenon of modulation of the nested cylindrical cavities with same narrow rectangular slots is more obvious. Finally, a comparison on the maximum coupling function curves of the nested rectangular cavities and the nested cylindrical cavities with same narrow rectangular slots is made and it is found that the inner rectangular slots of the two nested cavities make the coupling wave inside the outer cavities attenuated down by about 10 dB.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第10期122-125,150,共5页
High Voltage Engineering
基金
国家863计划资助项目。~~
关键词
微波脉冲
孔缝
耦合函数
共振频率
腔体调制
带缝嵌套腔体
microwave pulse
slot
coupling function
resonant frequency
cavity modulation
nested cavities with slots
