Takanori Noro

A study on the mechanism of wideband characteristics for single-fed stacked circularly polarization patch antenna

An antenna which is combined the lineally polarized hexagonal shaped feed patch and the square shaped parasitic patch is proposed for wideband circular polarization antenna. The mechanism of wideband characteristics is clarified.

Development of electronically controlled array antenna system for ETS-VIII applications

In this paper, we propose a configuration of antenna system for mobile ground terminal using GPS and gyroscope terminal unit as automatic-navigation system to track the ETS-VIII satellite. To miniaturize the antenna system we introduce an electronically tracking rather than mechanically by use of a developed control program. With this configuration the antenna system becomes light and low profile with more in reliability and high-speed beam scanning possibility. In this research, a left hand circularly polarized array antenna integrated with an onboard switching circuit is proposed. Measured results of return loss, axial ratio, elevation cut pattern and beam switching performance are presented.

Simple switched-beam antenna system for mobile satellite applications

Antenna system for land vehicle communications aimed at ETS-VIII applications was proposed. The proposed antenna system consists of an array antenna loaded with switching circuit onto which controlled by a developed program after receiving data input from gyro sensor of GPS unit. As a result, for an elevation angle El=48deg, three beams are electronically created in the azimuth direction with a minimum gain more than 5 dBic and an axial ratio less than 3 dB. In addition, the antenna beam could be automatically switched with good results.

A Circular Aperture Array Configuration with a Small Antenna Radius

In this paper, small sized arrays with a few elements are investigated. The antenna diameter is assumed to be less than 3λ o . The focus of this paper is to compare the gain characteristics of a triangle arrangement with these of a uniform arrangement. The method of moments is used to calculating the gain characteristics. It is shown that the triangle arrangement is not always sufficient to obtain maximum gain for a small-sized antenna with only a few elements. Also, the type of antenna element used greatly influences the required number of elements and the element configuration.

Radiation Characteristics of Sequentially Rotated 4 Elements Patch Antennas

In this paper, the radiation characteristics of sequentially rotated 4 elements patch array antenna is investigated. The paper is specially focused on the input impedance of the element antenna and the radiation pattern of the array antenna from the point of view of sequential array antenna