Kyohei Fujimoto

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G protein-coupled receptor 40 (GPR40) is abundantly expressed in pancreatic beta cells in rodents, where it facilitates glucose-induced insulin secretion in response to mid- to long-chain fatty acids in vitro. However, GPR40 gene expression in humans has not been fully investigated, and little is known about the physiological and pathophysiological roles of(More)
A unique folded loop antenna for handsets has been analyzed. The folded loop antenna is constituted by the concept of integration, by which the mode increase and small sizing are achieved. It has been shown that the folded loop antenna shaped like a half-wave folded dipole has similar structure as the balanced system and so almost no unbalanced currents(More)
One of the trends observed in mobile telephone technologies is the reduction in the size and weight of the handset. Accordingly, antennas used for such handsets must also follow the downsizing of the handset unit. Especially, built-in antennas are required for the latest handset antenna designs. A built-in folded dipole antenna (BFDA) for a handset is(More)
In this paper, in order to confirm the effectiveness of using the balanced antenna structure, the performance of the balance-fed antenna system for a handset under the influence of a human head or hand is analyzed numerically and experimentally. As a human head model, the COST (European Cooperation in the field of Scientific and Technical Research) 244(More)
Shogo Hayashida, Tomoki Tanaka, Hisashi Morishita, Yoshio Koyanagi and Kyohei Fujimoto Department of Electrical Engineering, National Defense Academy 1-10-20, Hashirimizu, Yokosuka-shi, 239-8686 Japan Tel: +81-468-41-3810 ext. 3382, Fax: +81-468-44-5911, e-mail: d03002@nda.ac.jp Panasonic Mobile Communications Co., Ltd.,5-3, Hikarinooka, Yokosuka-shi,(More)
In conventional handset antennas, some gain degradation is often observed when the handsets is hold at a talk position. This is caused by the variation of the current on the conducting box used in the handset due to the human body effect. By using a balance-fed antenna, the current can be reduced remarkably. Previously, a folded loop antenna (FLA) was(More)
Shogo Hayashida', Hisashi Morishita', Yoshio Koyanagi' a n d Kyohei Fujimoto3 'Department o f Electrical Engineering, National Defense Academy 1-10-20 Hashirimizu, Yokosuka 239-8686 Japan Tel: +81-468-41-3810 ext. 2261, Fax: +81-468-44-5911, e-mail: morishita(ii)nda.ac.ir, 2Mobile Terminal Division, Matsushita Communication Industrial CO., LTD., 600,(More)
If you’re involved in designing and developing small antennas, this complete, cuttingedge guide covers everything you need to know. From fundamentals and basic theory to design optimization, evaluation, measurements, and simulation techniques, all the essential information is included. You’ll also get many practical examples from a range of wireless(More)
Theoretical and experimental analysis of a newly proposed loop antenna for handsets is presented. A simple model, using a small rectangular and L-shaped loop antenna mounted on a ground plane, which represents a rectangular shielding plate used in the handset, is analyzed in order to confirm the effectiveness of using the balance-fed antenna system.