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Quasi-optical Analysis of Millimeter Antenna Feed System and Nearfield Measurements Research

Author: ChengYueYun
Tutor: WangHongJian
School: Graduate School, Chinese Academy of Sciences
Course: Electromagnetic Field and Microwave Technology
Keywords: Quasi-optical theory Gaussian beam Offset fed parabolic Antenna near-field test The unequal interval near and far field transform Probe Compensation
CLC: TN820
Type: Master's thesis
Year: 2010
Downloads: 70
Quote: 1
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Abstract


The millimeter-wave system by engineering more and more attention because of its high-resolution, large transmission capacity and good penetration characteristics of the atmospheric window. Millimeter wave, short millimeter wave system key technologies research involves theoretical algorithm, finishing techniques and testing methods. Especially the high-frequency electrically large, multi-polar, multi-beam antenna and feeding system design and testing is currently the key to solve the problem. Articles using the theory of quasi-optical the corrugated horn caliber field Gaussian beam expansion and Gaussian beam propagation characteristics of the near-field and far-field pattern of the corrugated horn; analysis of the separation characteristics of the wire grid polarization of the incident Gaussian beam cross-polarization effects;-depth discussion of the offset fed parabolic incident Gaussian beam Gaussian beam mode coupling effect, greatly simplifying the mode coupling analytic formula, Gaussian beam incident reflective surface cross-polarization level. By contrast with traditional physical optics simulation and experimental results verify the accuracy, efficiency offset fed antenna system of quasi-optical a Gaussian mode coupling analysis. Millimeter, short millimeter wave antenna near-field testing as the effective weather testing means for the scan frame, the mounting accuracy is extremely demanding, the actual measurement devices also tend higher frequency measurements can not be applied due to the mechanical accuracy limitations. The 18 antenna near-field test error analysis on the basis of conjugate gradient method is applied to solve the near-far field transformation equations, using non-equally spaced fast Fourier transform to obtain the same time complexity with the traditional FFT transform. Simulated and measured results contrast display, non-interval near to far field to be able to effectively overcome the limitations of traditional FFT interval sampling, the existing near-field measurement of the maximum frequency of use of machinery and equipment increased by 2 to 3 times; article concludes with a discussion of different position error model under the sampling point location, number of points, as well as spectral domain interval of convergence of the iterative process, and gives a corresponding improvement measures. In short, this study millimeter-wave, short millimeter wave antenna feeder system of quasi-optical theory and far-field transform near-field test method, based on the non-equidistant nearly overcome short millimeter wave antenna and feeding system the cascade design problems and FFT transform spacing sampling issues related tests to verify the accuracy of the analysis, the research has some significance for the millimeter wave, short millimeter wave even terahertz detection system.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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