Measuring Health: A Guide to Rating Scales and Questionnaires

The substrate integrated waveguide (SIW) technique makes it possible that a complete circuit including planar circuitry, transitions, and rectangular waveguides are fabricated in planar form using a standard printed circuit board or other planar processing techniques. In this paper, guided wave and modes characteristics of such an SIW periodic structure are studied in detail for the first time. A numerical multimode calibration procedure is proposed and developed with a commercial software package on the basis of a full-wave finite-element method for the accurate extraction of complex propagation constants of the SIW structure. Two different lengths of the SIW are numerically simulated under multimode excitation. By means of our proposed technique, the complex propagation constant of each SIW mode can accurately be extracted and the electromagnetic bandstop phenomena of periodic structures are also investigated. Experiments are made to validate our proposed technique. Simple design rules are provided and discussed.

Guided-wave and leakage characteristics of substrate integrated waveguide

Astronomical data analysis software and systems

There is increased recognition by the world’s scientific, industrial, and political communities that the concentrations of greenhouse gases in the earth’s
atmosphere, particularly CO_2, are increasing. For
example, recent studies of Antarctic ice cores to
depths of over 3600 m, spanning over 420 000 years,
indicate an 80 ppm increase in atmospheric CO_2 in
the past 200 years (with most of this increase
occurring in the past 50 years) compared to the
previous 80 ppm increase that required 10 000 years.2
The 160 nation Framework Convention for Climate
Change (FCCC) in Kyoto focused world attention on
possible links between CO2 and future climate change
and active discussion of these issues continues.3 In
the United States, the PCAST report4 “Federal
Energy Research and Development for the Challenges
of the Twenty First Century” focused attention
on the growing worldwide demand for energy and the
need to move away from current fossil fuel utilization.
According to the U.S. DOE Energy Information
Administration,5 carbon emission from the transportation
(air, ground, sea), industrial (heavy manufacturing,
agriculture, construction, mining, chemicals,
petroleum), buildings (internal heating, cooling, lighting),
and electrical (power generation) sectors of the
World economy amounted to ca. 1823 million metric
tons (MMT) in 1990, with an estimated increase to
2466 MMT in 2008-2012 (Table 1).

Catalysis Research of Relevance to Carbon Management: Progress, Challenges, and Opportunities

Substrate-integrated waveguide (SIW) technology represents an emerging and very promising candidate for the development of circuits and components operating in the microwave and millimetre-wave region. SIW structures are generally fabricated by using two rows of conducting cylinders or slots embedded in a dielectric substrate that connects two parallel metal plates, and permit the implementation of classical rectangular waveguide components in planar form, along with printed circuitry, active devices and antennas. This study aims to provide an overview of the recent advances in the modelling, design and technological implementation of SIW structures and components.

Review of substrate-integrated waveguide circuits and antennas

* 本稿の主要部分は,軽金属,66(2016),180-184.に掲載。 The main part of this paper has been published in Journal of The Japan Institute of Light Metals, 66 (2016), 180-184. ** UACJ Trading (America) Co., Ltd., Ph. D. *** (株)UACJ 技術開発研究所 第四研究部 No. 4 Research Department, Research & Development Division, UACJ Corporation **** (株)UACJ 技術開発研究所 研究企画業務部 Research Planning & General Service Department, Research & Development Division, UACJ Corporation 1.緒 言

Effects of Si content on recrystallization of 3003 aluminum alloy

In this article, following the Young's ideas, the physical optics (PO) radiation integral of the Herztian dipole wave scattered by a planar surface, is decomposed analytically by modified edge representation (MER) Line Integrals. It is shown, for the first time, numerically and analytically that two kinds of MER line integrals, that is, along the periphery of the scatterer and around the inner stationary phase point (SPP), correspond to the diffraction and the GO field, respectively.

http://ieeexplore.ieee.org/iel5/9896/31518/01469649.pdf

Vectorial GO and diffraction decomposition of physical optics scattering of dipole wave from planar surfaces in terms of modified edge representation line integrals

We propose and fabricate a 60 GHz-band compact photonic antenna module where a cavity antenna element and a photodiode as well as an optical fiber for RF power feeding are integrated. The operation of the fabricated photonic antenna is demonstrated, which is almost coincident to the simulation result.

60 GHz-band compact photonic antenna module with integrated photodiode

In this paper, a new algorithm to obtain S-parameters using the FDTD for a multi-mode waveguide is presented. In the proposed method, the complex electric field expression is calculated in different two virtual planes, and weighting coefficients for incident and reflected waves can be obtained by solving two equations corresponding to the two virtual planes together with modal decomposition. As an example of the analysis, the vacuum window of a unit-cell for a slotted waveguide array for plasma excitation is analyzed. The frequency characteristic of reflection coefficients calculated by the FDTD method agrees well with that by the generalized scattering matrix (GSM)-method of moments (MoM) hybridization analysis.

FDTD analysis of S-parameters for a multi-mode waveguide with CW excitation

A waveguide short-slot 2-plane coupler is proposed. It is designed to couple in the H- and E-planes, but should be considered propagation conditions of plural modes in the coupled region. Satisfying these conditions, the design of the coupled region and the ports is conducted. Its achieved bandwidth is approximately 2% restricted by the frequency characteristic of the propagating modes in the coupled region.

http://ieeexplore.ieee.org/iel7/7442673/7447267/07447513.pdf

Makoto Ando

Papers

Effects of Si content on recrystallization of 3003 aluminum alloy

Vectorial GO and diffraction decomposition of physical optics scattering of dipole wave from planar surfaces in terms of modified edge representation line integrals

60 GHz-band compact photonic antenna module with integrated photodiode

FDTD analysis of S-parameters for a multi-mode waveguide with CW excitation

Design of waveguide short-slot 2-plane couplers