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Millimeter wave E-plane waveguide junction circulator

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Millimeter wave E-plane waveguide junction circulator

New Configuration of the Polarizationinsensitive Optical circulator

2002 3rd International Conference on Microwave and Millimeter Wave Technology

作者： Liu ping Yang quanrang Department of Electrical Engineering Shantou University Shantou State Key Laboratory of Millimeter Waves Southeast University

ISBN: (纸本)078037486X

＜正＞E-plane circulator with the exact three-dimensional electromagnetic field theory is studied vet in consideration of surface *** with one ferrite disk is analysed for the first *** performances are calculated by *** the basis of this analysis,a Ka-band E-plane circulator has been developed,the experimental result is satisfactory.

关键词： E-Plane waveguide circulator surface modes optimization

来源： cnki会议评论

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Chinese Journal of Lasers 1999年第1期8卷 62-66页

作者： WANG Lindou SU Baofeng TAN Feng (Department of Electronic Engineering, Tianjin University, Tianjin 300072, China) 天津大学天津

１ＩｎｔｒｏｄｕｃｔｉｏｎＯｐｔｉｃａｌｃｉｒｃｕｌａｔｏｒｓａｓｎｏｎｒｅｃｉｐｒｏｃａｌｄｅｖｉｃｅｓａｒｅｖｅｒｙｕｓｅｆｕｌｆｏｒａｄｖａｎｃｅｄｏｐｔｉｃａｌｆｉｂｅｒｔｒａｎｓｍｉｓｉｏｎｓｙｓｔｅｍｓ．... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＯｐｔｉｃａｌｃｉｒｃｕｌａｔｏｒｓａｓｎｏｎｒｅｃｉｐｒｏｃａｌｄｅｖｉｃｅｓａｒｅｖｅｒｙｕｓｅｆｕｌｆｏｒａｄｖａｎｃｅｄｏｐｔｉｃａｌｆｉｂｅｒｔｒａｎｓｍｉｓｉｏｎｓｙｓｔｅｍｓ．Ｔｈｅｙｈａｖｅｂｅｅｎｕｓｅｄｉ...

关键词： circulator light transmission system nonreciprocal device

Elevated Ferrite Film circulator with Different Permittivities for Layers: An Analytical Expression for the Input Conductance Employing Perturbation Method

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Journal of Electromagnetic Analysis and Applications 2010年第9期2卷 529-542页

作者： Arash Rashidi Ali Banai 不详

The main idea of this paper is to find an analytical formula for the input conductance of an elevated ferrite film circu-lator to match it systematically to the desired matching network. For solving the ferrite loaded dielectric resonator included in stripline elevated ferrite film circulator, the off diagonal components of the permeability tensor are taken as the perturbation. The electromagnetic fields computations are done for unperturbed structure. The dipolar resonant frequencies corresponding to harmonics of the resonant modes are then calculated using the perturbation integrals. The quality factor of the circulator is derived in terms of these dipolar resonant frequencies. Energy integrals are calculated to find the energy stored in the ferrite and dielectic layers. An analytical expression for the input conductance of the elevated ferrite film circulators is derived by using the quality factor and energy integrals. In this expression the ferrite and dielectric layers can have different permittivities. Some discussions about the effect of ferrite film thickness and permittivity mismatch on the bandwidth of the circulator are investigated by HFSS commercial software.

关键词： Elevated Ferrite circulator Perturbation Integral Splitting Factor Dipolar Resonant Frequencies

EXACT ELECTROMAGNETIC FIELD THEORY FOR BROADBAND H-PLANE WAVEGUIDE JUNCTION circulatorS

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Science China Mathematics 1989年第9期32卷 1115-1127页

作者：窦文斌 Institute of Applied Physics Chengdu Institute of Radio Engineering Department of Radio EngineeringSoutheast UniveraityNanjing

This paper analyses the broadband H-plane waveguide junction circulators with the metal step and partial-height ferrite post. Using the field match method, the eigenmodes are given to expand the electromagnetic field in ferrite. The eigenmodes include not only the volume modes in literatures, but also the surface modes derived in this paper. Two sets of modes are used in analysis. The match between junction and waveguides is simplified, using a synthetic method, combining the electromagnetic field theory with the eigenvalue theory of the symmetric network scattering matrix and the transmission line theory. In an 8-mm band, the calculated bandwidth is 19％ with 20-dBisolatioa. Computation and experiments are in good agreement. The calculated results display n=2 Chebyshev response characteristics.

关键词： broadband waveguide circulator volume modes surface modes.

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A kind of multiwavelength erbium-doped fiber laser based on Lyot filter

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Chinese Physics B 2023年第3期32卷 252-257页

作者：周哲海吴婧仪闵昆龙赵爽李慧宇 Beijing Laboratory of Optical Fiber Sensing and System Beijing Information Science&Technology UniversityBeijing 100192China Beijing Aerospace Measurement&Control Technology Co. Ltd.Beijing 100041China

A multiwavelength tunable ring-cavity erbium-doped fiber laser(EDFL)based on a Lyot filter was *** the proposed Lyot filter,a comb filter consisting of an EDF-polarization-maintaining fiber(EDF-PMF),a polarization controller(PC),and a circulator with four ports was used to suppress the mode *** light transmission direction was guaranteed by the *** the proposed fiber laser,tunable single,dual,triple,quadruple,quintuple,sextuple,and septuple wavelengths were realized.A single-wavelength laser output with an optical signal-to-noise ratio(SNR)of up to30.56 dB was realized,and a tuning range of 1590.54 nm to 1599.54 nm was achieved by tuning the *** stability of the single,dual,triple,and quadruple-wavelength center power fluctuations was less than 0.05 dB,0.98 dB,5.07 dB,and7.71 dB *** the laser was operated in the multiwavelength condition,the SNR was more than 20.97 *** proposed erbium-doped fiber laser is suitable for fiber-sensing system applications.

关键词： multiwavelength erbium-doped fiber laser Lyot filter polarization-maintaining fiber circulator

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