矩形双脊波导传输特性研究  

Transmission Characters of Rectangle Double-ridge Waveguide

作　　者：李龙洲 雷前召 张修兴 LI Longzhou;LEI Qianzhao;ZHANG Xiuxing(School of Mathematics and Physics,Weinan Normal University,Weinan 714099,China)

机构地区：[1]渭南师范学院数理学院,陕西渭南714099

出　　处：《济南大学学报（自然科学版）》2018年第6期516-520,共5页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(11304230);陕西省2017年军民融合研究基金项目(JMR29);陕西省教育厅2016年度专项科学研究计划项目(16JK1278);渭南师范学院2018年自然科学研究重点项目(18YKF03);渭南师范学院2017年自然科学类横向项目(2017HXP14)

摘　　要：为了寻找最佳传输特性的波导结构,通过矩形波导内电磁波的波方程、矩形波导内截止波长特性,结合微扰理论以及时域有限差分法研究矩形波导、双脊波导内电磁波传播特性,计算分析矩形波导、双脊波导截止波长随波导结构尺寸的变化。结果表明:双脊波导的脊间距越小,单模带宽越大,矩形双脊波导的截止波长较同尺寸矩形波导大;模拟的双脊波导内电磁波主模与第一高次模的场结构图显示,在对称双脊波导的脊点处场强变化、能量损失最大。In order to find a waveguide structure with the best transmission characteristics,by using the electromagnetic(EM)wave equation and the characteristics of the cut-off wavelength in the rectangular waveguide,combined with the perturbation theory and finite difference time domain(FDTD)method,the propagation characteristics of EM waves in a rectangular waveguide or double-ridged waveguide were studied.The relationship between the cut-off wavelength of a rectangular waveguide or double-ridged waveguide and the size of waveguide structure were calculated and analyzed.The results show that the smaller the ridge pitch of the dual-ridged waveguide is,the longer the single-mode bandwidth is,and the cut-off wavelength of a rectangular double-ridged waveguide is larger than that of a rectangular waveguide.The EM field structure diagram of main mode and the first high-order mode of EM wave in the simulated dual-ridged waveguide show that the EM field intensity has the biggest change at the ridge point of a symmetric double-ridged waveguide,and the energy loss is also the largest in the same ridge point.

关 键 词：矩形波导 脊波导 微扰理论 时域有限差分法 截止波长 

分 类 号：TN62[电子电信—电路与系统]