The equations of electrodynamics for a gyrotropic medium by using Maxwell’s equa-tions are deduced.Through Fourier transformation,the admittances of TM and TE modes inthe electrically gyrotropic substrate and magneti...The equations of electrodynamics for a gyrotropic medium by using Maxwell’s equa-tions are deduced.Through Fourier transformation,the admittances of TM and TE modes inthe electrically gyrotropic substrate and magnetically gyrotropic substrate are given.Numericalresults of the dominant mode in magnetized ferrite-loaded double-layered finlines are presentedwhich could be used in designing finline ferrite devices.展开更多
This paper mainly discusses the analysis and design of a finline single-ended mixer and detector. In the circuit, for the purpose of eliminating high-order resonant modes and improving transition loss, metallic via ho...This paper mainly discusses the analysis and design of a finline single-ended mixer and detector. In the circuit, for the purpose of eliminating high-order resonant modes and improving transition loss, metallic via holes are implemented along the mounting edge of the substrate embedded in the split-block of the WG-finline-microstrip transition. Meanwhile, a Ka band slow-wave and bandstop filter, which represents a reactive termination, is designed for the utilization of idle frequencies and operation frequencies energy. Full-wave analysis is carded out to optimize the input matching network of the mixer and the detector circuit using lumped elements to model the nonlinear diode. The exported S-matrix of the optimized circuit is used for conversion loss and voltage sensitivity analysis. The lowest measured conversion loss is 3.52 dB at 32.2 GHz; the conversion loss is flat and less than 5.68 dB in the frequency band of 29-34 GHz. The highest measured zero-bias voltage sensitivity is 1450 mV/mW at 38.6 GHz, and the sensitivity is better than 1000 mV/mW in the frequency band of 38-40 GHz.展开更多
本文在综合Turnstile型、BФifot型、Finline型等三种正交模耦合器(Ortho-mode transducer,OMT)的发展现状及其优缺点的基础上,选取Turnstile型OMT作为优先研制方案,仿真设计了工作于30 GHz-50 GHz频段的超宽带正交模耦合器。结果显示,...本文在综合Turnstile型、BФifot型、Finline型等三种正交模耦合器(Ortho-mode transducer,OMT)的发展现状及其优缺点的基础上,选取Turnstile型OMT作为优先研制方案,仿真设计了工作于30 GHz-50 GHz频段的超宽带正交模耦合器。结果显示,设计频段内的双极化端口反射系数均小于-20 d B,隔离度大于53 d B,插入损耗小于0.15 d B,输出端口交叉极化电平小于-53 d B。展开更多
文摘The equations of electrodynamics for a gyrotropic medium by using Maxwell’s equa-tions are deduced.Through Fourier transformation,the admittances of TM and TE modes inthe electrically gyrotropic substrate and magnetically gyrotropic substrate are given.Numericalresults of the dominant mode in magnetized ferrite-loaded double-layered finlines are presentedwhich could be used in designing finline ferrite devices.
基金supported by the National Natural Science Foundation of China(No.60621002)
文摘This paper mainly discusses the analysis and design of a finline single-ended mixer and detector. In the circuit, for the purpose of eliminating high-order resonant modes and improving transition loss, metallic via holes are implemented along the mounting edge of the substrate embedded in the split-block of the WG-finline-microstrip transition. Meanwhile, a Ka band slow-wave and bandstop filter, which represents a reactive termination, is designed for the utilization of idle frequencies and operation frequencies energy. Full-wave analysis is carded out to optimize the input matching network of the mixer and the detector circuit using lumped elements to model the nonlinear diode. The exported S-matrix of the optimized circuit is used for conversion loss and voltage sensitivity analysis. The lowest measured conversion loss is 3.52 dB at 32.2 GHz; the conversion loss is flat and less than 5.68 dB in the frequency band of 29-34 GHz. The highest measured zero-bias voltage sensitivity is 1450 mV/mW at 38.6 GHz, and the sensitivity is better than 1000 mV/mW in the frequency band of 38-40 GHz.
文摘本文在综合Turnstile型、BФifot型、Finline型等三种正交模耦合器(Ortho-mode transducer,OMT)的发展现状及其优缺点的基础上,选取Turnstile型OMT作为优先研制方案,仿真设计了工作于30 GHz-50 GHz频段的超宽带正交模耦合器。结果显示,设计频段内的双极化端口反射系数均小于-20 d B,隔离度大于53 d B,插入损耗小于0.15 d B,输出端口交叉极化电平小于-53 d B。
