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Improved method for analyzing quasi-optical launchers 被引量:2
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作者 吴泽威 李浩 +2 位作者 徐建华 李天明 李家胤 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第5期659-664,共6页
An improved method for analyzing the radiation characteristic of the quasi-optical launcher is presented. The launcher is decomposed into an open-ended waveguide and a helical cut according to the proposed method. The... An improved method for analyzing the radiation characteristic of the quasi-optical launcher is presented. The launcher is decomposed into an open-ended waveguide and a helical cut according to the proposed method. The radiation from the open-ended waveguide is obtained by using the Stratton-Chu formulation. The helical cut's radiation is calculated based on its current distribution, gained by several iterative computations, which helps to improve the calculation accuracy since the diffraction effect introduced by the helical cut is considered during the calculation. The proposed method is used to study different launches, and the results are compared with the existing results. Good agreement is achieved between the results obtained from our proposed method and the reported results. The present results provide an alternative for analysis and synthesis of the optical-mode converter. 展开更多
关键词 GYROTRON quasi-optical launcher Stratton-Chu formulation
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Asymmetrical mirror optimization for a 140 GHz TE_(22,6) quasi-optical mode converter system 被引量:1
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作者 夏冬 金铭 白明 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第7期75-80,共6页
We introduce an asymmetrical mirror design to a 140 GHz TE_(22,6) quasi-optical(QO) mode converter system to correct the asymmetry of the beam's field distribution caused by the Denisov launcher. By such optimiza... We introduce an asymmetrical mirror design to a 140 GHz TE_(22,6) quasi-optical(QO) mode converter system to correct the asymmetry of the beam's field distribution caused by the Denisov launcher. By such optimization, the output beam with better symmetrical distribution is obtained at the system's output window. Based on the calculated results,the QO mode converter system's performance is already satisfying without iterative phase correction. Scalar and vector correlation coefficients between the output beam and the fundamental Gaussian beam are respectively 98.4% and 93.0%,while the total power transmission efficiency of the converter system is 94.4%. The assistance of optical ray tracing to the design of such QO mode converters is introduced and discussed as well. 展开更多
关键词 asymmetrical mirror design optical ray tracing quasi-optical mode converter
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Denisov-type quasi-optical mode converter forhigher-order asymmetric volume mode gyrotron
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《强激光与粒子束》 EI CAS CSCD 北大核心 2016年第7期89-96,共8页
The principle and design method of Denisov-type quasi-optical mode converter is investigated indetail. The operation process of the Denisov-type launcher is analyzed by applying the geometrical optics, andthe Gaussian... The principle and design method of Denisov-type quasi-optical mode converter is investigated indetail. The operation process of the Denisov-type launcher is analyzed by applying the geometrical optics, andthe Gaussian-like field distribution achieved on the waveguide wall is also derived. The method for designing arippled-wall launcher is proposed on the basis of coupled mode theory. A simulation code for Denisov-type qua-si-optical mode converter GQOMC-D is developed based on coupled mode theory, vector diffraction integrationand physical optics, which is compared to the design parameters and experimental results reported in literaturefor its validity. According to this code, a Denisov-type quasi-optical mode converter used in 110 GHz TE22.6mode gyrotron oscillators is designed. Simulation results indicate that a Gaussian-like beam is obtained at theoutput window with a scalar content of 98.4 % and a conversion efficiency of 94.7 %. 展开更多
关键词 GYROTRON quasi-optical MODE converter Denisov-type LAUNCHER coupled MODE theory
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Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method
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作者 Shouqi XIONG Donghui XIA +4 位作者 Mei HUANG Gangyu CHEN Wenting WENG Guoyao FAN Yuan PAN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第10期139-146,共8页
The accurate power measurement is important for an ECRH system in tokamak.The dummy load is designed and developed for the measurement of the millimeter wave power.This work analyzes the dummy load based on the quasi-... The accurate power measurement is important for an ECRH system in tokamak.The dummy load is designed and developed for the measurement of the millimeter wave power.This work analyzes the dummy load based on the quasi-optical method and the ray tracing method.The reflectivity and thermal deposition of the dummy load have been considered to ensure the safety of the entire system.High-power tests have been carried out at a 105 GHz/500 kW ECRH system.The results of the tests indicate that the designed dummy load is stable and valid. 展开更多
关键词 dummy load power measurement quasi-optical method ray tracing ECRH
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AN ANALYSIS ON INPUT IMPEDANCE OF A SINGLE MICROSTRIP PATCH IN THE QUASI-OPTICAL CAVITY
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作者 何宜军 杨铨让 《Journal of Electronics(China)》 1994年第2期150-155,共6页
The electromagnetic field integral equation in the quasi-optical cavity is obtained using the dyadic Green’s function. An expression is derived for the input impedance of a single microstrip patch cavity excited by a... The electromagnetic field integral equation in the quasi-optical cavity is obtained using the dyadic Green’s function. An expression is derived for the input impedance of a single microstrip patch cavity excited by a coaxial probe using moment method. The input impedance of a rectangular microstrip patch is discussed with this method. The result of this paper is similar to that of the microstrip antenna. This paper is of very important value for designing microstrip quasi-optical oscillator. 展开更多
关键词 OSCILLATOR quasi-optical CAVITY Input IMPEDANCE MICROSTRIP PATCH MOMENT method
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Design of Quasi-Optical Lens Antenna for W-Band Short Range Passive Millimeter-Wave Imaging
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作者 Qike Chen Yong Fan +1 位作者 Jingshi Zhou Kaijun Song 《Journal of Computer and Communications》 2015年第3期93-99,共7页
A quasi-optical dielectric lens used for W-band focal plane array passive imaging has been developed. The imaging system requires the lens to form beam spot with 3 dB width less than 35 mm at distance of 3500 mm. The ... A quasi-optical dielectric lens used for W-band focal plane array passive imaging has been developed. The imaging system requires the lens to form beam spot with 3 dB width less than 35 mm at distance of 3500 mm. The powerful optical design software ZEMAX was utilized to design the contours of the lens, and numerical method based on ray tracing and Huygens’ Principle was processed to verify the design result. Measurement result shows that the 3 dB width of the beam spot formed by the lens is 34 mm at distance of 3460 mm, and the beam pattern on imaging plane are equally arranged and the intensity decreases only 0.55 dB while the object lateral deviation increases to 300 mm. 展开更多
关键词 quasi-optical LENS PASSIVE MILLIMETER-WAVE Imaging Numerical Method Huygens’ PRINCIPLE
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YBa_2Cu_3O_7高温超导双晶约瑟夫森结阵列毫米波辐射特性
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作者 刘新英 岳宏卫 +2 位作者 谢清连 邓进丽 肖功利 《桂林电子科技大学学报》 2016年第2期169-172,共4页
针对高温超导约瑟夫森结器件的电磁辐射效率低、实用性差的问题,采用嵌入Quasi-Optical谐振腔的方式,研究YBa2Cu3O7高温超导双晶约瑟夫森结阵列的毫米波辐射特性。将基片作为介质谐振器,通过双晶约瑟森结阵列、介质谐振器和Quasi-Optica... 针对高温超导约瑟夫森结器件的电磁辐射效率低、实用性差的问题,采用嵌入Quasi-Optical谐振腔的方式,研究YBa2Cu3O7高温超导双晶约瑟夫森结阵列的毫米波辐射特性。将基片作为介质谐振器,通过双晶约瑟森结阵列、介质谐振器和Quasi-Optical谐振腔的共同谐振作用加强了结阵列与外部微波电路的耦合。使用混频检测技术,在78.6K温度下,实验制备并测量了由644个双晶约瑟夫森结组成的串联结阵列的毫米波辐射特性,得到辐射峰的中心频率为69.3GHz,检测到的辐射功率约为20pW,提高了辐射效率。 展开更多
关键词 高温超导薄膜 quasi-optical谐振腔 约瑟夫森结 Shapiro台阶
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A millimeter and sub-millimeter wave frequency selective surface beamsplitter for geostationary orbit microwave radiometers 被引量:1
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作者 崔广斌 赵海博 +1 位作者 张勇芳 苗俊刚 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第11期214-221,共8页
We report the design of three frequency selective surface (FSS) filters used on the FengYun-4 (FY-4) microwave satellite, which separate five-frequency bands in the frequency range of 50-429 GHz with the insertion... We report the design of three frequency selective surface (FSS) filters used on the FengYun-4 (FY-4) microwave satellite, which separate five-frequency bands in the frequency range of 50-429 GHz with the insertion loss less than 0.4 dB, and separation between adjacent channels more than 20 dB for either TE or TM incidence. Firstly, we briefly introduce the disadvantages of two types of FSS filter: waveguide-array FSS and printed FSS, which are commonly employed in the millimeter and sub-millimeter wave band. In order to meet the insertion loss requirement and specified spectral transmission response, we adopt a filter composed of two closely spaced freestanding metal plates, which con- tains an array of resonant ring slot elements. Computer simulation technology (CST) is used to optimize the structural dimensions of the resonant unit and interlayer separation. Numerical results show that these FSS filters exhibit trans- mission loss of less than 0.4 dB and separation between adjacent channels of more than 20 dB. Simulated transmission coefficients are in close agreement with the required specification, and even exceed the performance specifications. 展开更多
关键词 millimeter and sub-millimeter wave frequency selective surface quasi-optical system
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Kinetic theory of a novel high-relativistic free electron quasi-optical maser
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作者 刘濮鲲 杨中海 +1 位作者 钱尚介 刘盛纲 《Science China Mathematics》 SCIE 1995年第11期1363-1376,共14页
A novel quasi-opitcal resonance system modified axisymmetrical quasi-optical cavity of oblique ratation(MAQCOR)-is proposed using the laplace integral transormation the kinetic theory of the high relativsitic electron... A novel quasi-opitcal resonance system modified axisymmetrical quasi-optical cavity of oblique ratation(MAQCOR)-is proposed using the laplace integral transormation the kinetic theory of the high relativsitic electron cyclotron maser with MAQCORis carried out within the framowrk of the linearized vlasov-mxawel eauations the formulas of beamwave intreaction power starting current and frequency shift have been derived some important plroblems such as high-order harmonic modes competition inflneces of the rationg angle and space charge and space chrage effcet are andlyaed and discussed in detall and a serios fo new condinsions are obtained a theoretical bssia is laid for the design of this novel qussi-optical gyrotron 展开更多
关键词 NOVEL quasi-optical CAVITY high RELATIVISTIC electrom eyclotron MASER kinettic theory SPACE-CHARGE dffect
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