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  • Wang, Hai  (4)
  • Yu, Junsheng  (4)
  • Englisch  (4)
  • 2015-2019  (4)
Materialart
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  • Englisch  (4)
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  • 2015-2019  (4)
Jahr
  • 1
    Online-Ressource
    Online-Ressource
    Numerical and experimental verification of a trireflector compact antenna test range in the terahertz band
    Wiley ; 2015
    In:  Microwave and Optical Technology Letters Vol. 57, No. 7 ( 2015-07), p. 1686-1689
    Details
    In: Microwave and Optical Technology Letters, Wiley, Vol. 57, No. 7 ( 2015-07), p. 1686-1689
    Kurzfassung: Numerical and measured results of the quiet zone performance of a trireflector compact antenna test range (CATR) system in the terahertz band are presented in this letter. A modular Gaussian beam (GB) analysis method, which consists of frame‐based Gabor transformation, GB reflection and a 3D GB diffraction technique, was implemented to evaluate the quiet zone performance. Compared to geometrical optics method, this method is valid in predicting the field distribution in the caustic region. Moreover, simulation results of the CATR system demonstrated a superior efficiency to the physic optics method, especially in the terahertz range. Measured results show that 70% quiet zone usage can be achieved with amplitude and phase ripples less than 1.2 dB and 15°, respectively in the central frequencies. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1686–1689, 2015
    Materialart: Online-Ressource
    ISSN: 0895-2477 , 1098-2760
    URL: Issue
    URL: Article
    DOI: 10.1002/mop.v57.7
    DOI: 10.1002/mop.29169
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2015
    ZDB Id: 2000574-X
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Theoretical and Experimental Comparison Results of Dual-Channel 3D Quasi-Optical Network System between Frequency Selective Surface and Wire Grid Polarizer
    Hindawi Limited ; 2018
    In:  International Journal of Antennas and Propagation Vol. 2018 ( 2018), p. 1-18
    Details
    In: International Journal of Antennas and Propagation, Hindawi Limited, Vol. 2018 ( 2018), p. 1-18
    Kurzfassung: A dual-channel 3D quasi-optical network (QON) system is analyzed and compared by theoretical and experimental results. It is divided into dual-channel signals by frequency selective surface (FSS) or wire grid polarizer (WGP) for transmitting the 324 GHz signal on the top layer while diverting the 183 GHz signal to the bottom layer. The system structure based on the beam radius is traced by the complex beam parameter and system transfer matrix for deciding the positions of cascade mirrors. The design principles and test results of FSS with perforated hexagonal array and WGP printed on the dielectric substrate are discussed together. In order to evaluate channel performance, the output planar near-fields of QON system are simulated and tested by the four reflections and three transmission results, respectively, where both scalar and vector conversion efficiencies are used to evaluate the quality of output beams. For the distortion phenomenon and energy loss in planar field, the aperture modes of corrugated horn feeds are analyzed by spherical wave expansion (SWE) to explain the asymmetrical pattern characteristic. The cut section of the far-field pattern is also directly measured in the compact antenna test range (CATR), comparing with the far-field patterns that are indirectly obtained based on the principle of near-to-far-field transformation and ideal aperture field integral of quiet zone (QZ). The differences between the near- and far-field test in QON have been compared, and discussion that the corresponding experimental results verify the WGP has better work performance in the good pattern symmetry, high cross-polarization isolation, low energy loss, and side-lobe level.
    Materialart: Online-Ressource
    ISSN: 1687-5869 , 1687-5877
    URL: Article
    DOI: 10.1155/2018/3730121
    Sprache: Englisch
    Verlag: Hindawi Limited
    Publikationsdatum: 2018
    ZDB Id: 2397585-4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Investigations on Shaped Mirror Systems in Quasi-Optical Mode Converters Based on Irradiance Moments Method
    Hindawi Limited ; 2016
    In:  International Journal of Antennas and Propagation Vol. 2016 ( 2016), p. 1-13
    Details
    In: International Journal of Antennas and Propagation, Hindawi Limited, Vol. 2016 ( 2016), p. 1-13
    Kurzfassung: A method of transforming high-order Gaussian beams (GBs) mode into circular symmetry fundamental Gaussian beam (FGB) mode with arbitrary waist size is presented using irradiance moments method in quasi-optical (QO) mode converters. The double shaped mirrors correcting amplitude and phase simultaneously are generated by a single incidence irradiance sampling data and known ideal output FGB taking advantage of linear moment matching technique and Fresnel diffraction theory, which can be applied to a wide frequency range especially significant for terahertz band. The numerical coding procedure of creating double correcting mirrors and its fast convergence speed are discussed at 325 GHz. Numerical and experimental comparisons reveal the conclusion that enhancing surface precision and increasing moments order can improve main lobe levels.
    Materialart: Online-Ressource
    ISSN: 1687-5869 , 1687-5877
    URL: Article
    DOI: 10.1155/2016/8043042
    Sprache: Englisch
    Verlag: Hindawi Limited
    Publikationsdatum: 2016
    ZDB Id: 2397585-4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Numerical and Experimental Verification of a 3D Quasi-Optical System
    Hindawi Limited ; 2015
    In:  International Journal of Antennas and Propagation Vol. 2015 ( 2015), p. 1-10
    Details
    In: International Journal of Antennas and Propagation, Hindawi Limited, Vol. 2015 ( 2015), p. 1-10
    Kurzfassung: A modular and efficient Gaussian beam (GB) analysis method, incorporating frame-based Gabor transformation, GB reflection, and a 3D GB diffraction technique, was developed to analyze both the reflectors and frequency selective surface (FSS) in quasi-optical (QO) system. To validate this analysis method, a 3D dual-channel QO system operating at 183 and 325 GHz was designed and tested. The proposed QO system employs two-layer structure with a FSS of perforated hexagonal array transmitting the 325 GHz signal on the top layer while diverting the 183 GHz signal to the bottom layer. Measured results of the system demonstrate that the agreement can be achieved down to −30 dB signal level for both channels in the far field pattern. The discrepancy between the calculation and measurement is within 2 dB in the main beam region (2.5 times −3 dB beamwidth), verifying the effectiveness and accuracy of the proposed method.
    Materialart: Online-Ressource
    ISSN: 1687-5869 , 1687-5877
    URL: Article
    DOI: 10.1155/2015/595023
    Sprache: Englisch
    Verlag: Hindawi Limited
    Publikationsdatum: 2015
    ZDB Id: 2397585-4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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