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4 results on '"Okawa, Mitsugu"'

1. Development of Advanced HTS Onboard Ka-band Antennas for Engineering Test Satellite 9

Author

Kusano Masaaki, Tsuji Hiroyuki, Kanasashi Arimasa, Yoshimura Naoko, Okawa Mitsugu, Abe Yuma, Orikasa Teruaki, Tanaka Tai, Toyoshima Morio, Sunaga Terumi, Morikawa Eihisa, Tsunoda Toshiyasu, Miura Amane, Uchida Shigeru, Horie Nobuyoshi, Sakai Eiichi, Okura Takuya, and Takahashi Takashi

Subjects
business.industry, Computer science, Astrophysics::Instrumentation and Methods for Astrophysics, Electrical engineering, Spectral efficiency, Communications system, High-throughput satellite, Ka band, Satellite, Antenna (radio), business, Throughput (business), Beam (structure), Computer Science::Information Theory
Abstract

We have developed the advanced onboard antennas for High Throughput Satellite (HTS). They are three types of the antennas utilizing Ka-band frequencies to aim in-orbit verification by the Japanese Engineering Test Satellite 9 (ETS-9). First antenna is the fixed multi-beam antenna (Fixed MBA) employing the miniaturized and integrated feeder unit to enable dense allocation of multi beams for improvement of spectrum efficiency. Second antenna is the Digital Beam Forming antenna (DBF-ANT) to enable flexible beam shape. Third antenna is the common communications system antenna (CCS-ANT) transmitting broad beam which has beacon transmission function etc.

Published
2021
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4. E-Plane Planar Circuit--Planar Circuit Equations and Method of Analysis.

Author

Jui-Pang, Hus, Anada, Tetsuo, and Okawa, Mitsugu

Subjects
MAGNETIC fields, FIELD theory (Physics), ELECTRIC fields, ELECTROMAGNETIC fields, MAXWELL equations, PARTIAL differential equations, ELECTROMAGNETIC theory
Abstract

In contrast to the conventional planar circuit where the magnetic field is parallel to the plane, here a new planar circuit, in which the electric field is parallel to the planar circuit, is proposed and called an E-plane planar circuit. Hence, the conventional planar circuit becomes an H-plane planar circuit. in this paper, first, the features and advantages of the E-plane planar circuit are described in comparison with the H-plane planar circuit. Then the planar circuit equations which are based on the concepts of magnetic mode voltage and current are derived from Maxwell's equations. Moreover, the concept of magnetic mode impedance is proposed as a tool for the analysis of an arbitrarily shaped E-plane planar circuit with metal side walls, and its equivalent circuit is derived by expressing the magnetic mode impedance as an expansion of the normal modes of the planar circuit. As an example of the analysis, a square- shaped planar circuit is selected and the essential problems caused by the analysis mentioned here are examined. Wideband frequency characteristics are calculated and by comparison with the experimental values, the validity of this method is confirmed. Finally, as an example of an arbitrarily shaped planar circuit, the wideband frequency characteristics of a rectangular-waveguide E- plane corner-cut right angle bend are calculated by the forementioned method. [ABSTRACT FROM AUTHOR]

Published
1991

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