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Featured researches published by Akira Ahagon.


IEEE Transactions on Magnetics | 1990

3-D electromagnetic field mode analysis using finite element method by edge element

Kazuyuki Sakiyama; Hidetoshi Kotera; Akira Ahagon

A method of calculating the 3-D electromagnetic field mode using the finite-element method is presented. A variational finite-element method is derived from edge elements which are based on the ordinary formulation of isoparametric elements. The nondivergent condition of the electric or magnetic field can be taken into account in this edge element. The proposed program can solve eigenvalue problems directly because nonphysical spurious solutions can be eliminated as zero eigenvalue modes. This method is applied to the mode analysis of a magnetron cavity resonator. The resonant frequency and eigenvector are calculated successfully. >


Archive | 2003

High frequency heating apparatus

Koji Yoshino; Takashi Kashimoto; Makoto Shibuya; Hirohisa Imai; Akira Ahagon


Archive | 1995

High frequency heating apparatus for providing a uniform heating of an object

Koji Yoshino; Takashi Kashimoto; Makoto Shibuya; Akira Ahagon


Archive | 1999

High frequency heating apparatus for selective heating of a desired portion of an object

Koji Yoshino; Takashi Kashimoto; Makoto Shibuya; Hirohisa Imai; Akira Ahagon


Archive | 2000

Thin film magnetic head and method for fabricating same

Akira Ahagon; Masaya Sakaguchi; Hiroyasu Tsuji; Satoru Mitani


Archive | 1999

Variable-impedance unit, microwave device using the unit, and microwave heater

Tomotaka Nobue; Akemi Fukumoto; Akira Ahagon; Tomoko Tani; Koji Yoshino


Archive | 2002

Perpendicular magnetic recording medium and apparatus including a soft magnetic layer, an at least 20 nm thick non-magnetic layer, and a 50-90 nm gap length

Toshio Fukazawa; Masaya Sakaguchi; Akira Ahagon


Archive | 1991

Instrument for analysis of levitation of rapidly moving structure such as a magnetic tape across an air gap

Hiromi Kita; Hidetoshi Kotera; Kazuyuki Sakiyama; Akira Ahagon


Archive | 1991

Electromagnetic field analyzer for devices in which an electromagnetic field is present near a conductor and an electric charge moves in the electromagnetic field, and method of analyzing an electromagnetic field

Kazuyuki Sakiyama; Akira Ahagon; Hidetoshi Kotera; Hiromi Kita


Archive | 2002

Magnetic recording medium and magnetic recording and reproduction apparatus

Toshio Fukazawa; Masaya Sakaguchi; Akira Ahagon

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