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Radiation Performance (radiation + performance)
Selected AbstractsDesign of A Soft X-ray Source with Periodic Microstructure Using Resonance Transition Radiation for Tabletop SynchrotronIEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 3 2008Koji Sugano Member Abstract A soft X-ray source with a periodic aluminum multilayer structure with vacuum layers in between for tabletop synchrotrons with low-energy electrons was designed, and the dependence of radiation performance on structural parameters was clarified using a theoretical calculation of the resonance transition radiation. A photon density of 1 keV pr incident electron was calculated by optimizing the thickness of the aluminum and vacuum layers. Furthermore, the designed structure was fabricated by a microfabrication technique. The effects of dimensional error on the photon density are discussed on the basis of the calculated results and the prototype structure of a 6-MeV synchrotron. It is clarified that dimensional errors of 1.5% in Al layers and of plus or minus a few dozen nanometers in the vacuum layers are negligible in obtaining a photon density of more than 90% of the maximum value. © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source] Cavity backed dual slot antenna for gain improvementMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010Jin Xin Li Abstract A simple method of gain improvement for the cavity backed slot antenna based on the substrate integrated waveguide technique has been presented in this article. By using dual slot at the cavity edges to substitute a single slot at the cavity center as the radiating element, gain of the cavity backed slot antenna has been improved about 1.7 dB whereas its total size is little reduced. The proposed antenna has high radiation performance and keeps the advantages low profile, easy integration, and low cost fabrication. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2767,2769, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25582 [source] Ultra-wideband folded loop antenna fed by coplanar waveguideMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2008W. J. Lui Abstract In this article, a novel and successful design of ultra-wideband folded loop antenna is proposed and investigated. The antenna is fed by coplanar waveguide directly and can be fabricated easily by employing printed circuit board technology. It is studied both numerically and experimentally. From calculated and measured results, it may be observed that impedance bandwidth of over 130% for return loss lower than ,9.54 dB and good omnidirectional radiation performance is obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3075,3077, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23890 [source] Broadband elliptical dielectric resonator antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2006P. V. Bijumon Abstract A broadband low-loss elliptical dielectric resonator antenna (DRA) excited by using the microstrip-line technique is proposed. The effect of geometrical modifications of the microstrip feed line on the gain, bandwidth, and radiation performances of the antenna has also been investigated. The proposed antenna offers enhanced radiation characteristics compared to conventional microstrip-patch antennas. © Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 65,67, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21262 [source] | ||||||||||