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Electromagnetic Characteristics (electromagnetic + characteristic)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

Fundamental characteristics and 3D electromagnetic analysis for magnetic levitation transporter using YBCO superconductors

ELECTRICAL ENGINEERING IN JAPAN, Issue 2 2007
Hiroshi Ueda
Abstract A magnetic levitation device with two-dimensional movement, the so-called "levitating X-Y transporter," has been developed. In order to develop a working levitating X-Y transporter, it is necessary to clarify the levitation characteristics, such as the lift force, levitation height, and stability against mechanical disturbances. In this paper, we examine the lift and the restoring force experimentally and propose a new simulation program based on the three-dimensional hybrid finite and boundary element method to analyze the dynamic behavior of electromagnetic characteristics of YBCO bulk. Using the numerical simulation and experiments, we investigated a suitable arrangement of permanent magnets to enhance the levitation characteristics. We also designed a levitating transporter which can carry a load of 200 kg with a gap of 16 mm. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 159(2): 44,54, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20220 [source]

Study of geometric degeneracies in electromagnetic characteristics of magnetron-type corrugated cavity

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2002
Andriy E. Serebryannikov
Abstract A geometric degeneracy that can occur in natural frequencies and external Q factors of magnetron-type cavities is studied. We analyze the causes of its appearance and consider its feasibility to enhance the efficiency of the cavity design. Transcendental frequency-independent equations, the solutions of which can be easily obtained, and efficient estimates based on rigorous analysis are suggested to predict the existence of the degeneracy. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12: 320,331, 2002. Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mmce.10030 [source]

A directive patch antenna with metamaterial structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2007
Zi-bin Weng
Abstract A new method to improve the gain of patch antenna with metamaterial composed of ring aperture lattice is presented. The influences of the number of metamaterial layers and a comparison of electromagnetic characteristics between the conventional patch antenna and the new metamaterial patch antenna are studied by using numerical simulation method. Then, a patch antenna with the metamaterial is fabricated and measured. The simulation and experimental results show that this method is effective and this structure can realize congregating the radiation energy, thus the gain of the antenna with metamaterial can greatly increase when compared with the conventional one. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 456,459, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22146 [source]

New low profile cavity-backed Hilbert slot antenna

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2006
Guido Biffi Gentili
Abstract In this paper, the use of a cavity-backed Hilbert surface as an efficient slot-like narrowband radiating aperture is suggested, to exploit its own unique electromagnetic characteristics in the context of radio frequency identification (RFID) applications. The proposed meta-slot antenna (MSA) consists of a Hilbert surface window (HSW) made of a cascade of space-filling slot inclusions of order three and backed by a very shallow cavity that contributes to its surface impedance and radiation characteristics. A straight longitudinal microstrip line printed on a thin, low permittivity substrate, whose ground plane includes the HSW, feeds the aperture through distributed electromagnetic coupling. As illustrated by simulation results and measurements, the antenna behaves as a magnetic current sheet over a ground plane, with a highly frequency-selective impedance response and unidirectional radiation pattern. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2577,2581, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21995 [source]