Yoshio Inasawa

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In the design of radio placement on the large outdoor environments, the huge calculation time of radio propagation estimation is critical matter. In order to shorten the calculation time, we are developing a simulator using vertical plane launch (VPL) technique which is known as speedy ray searching method. In this paper, we evaluate the calculation(More)
In this paper, we verified the Poggio, Miller, Chang, Harrington, Wu and Tsai - Characteristic Basis Function Method (PMCHWT-CBFM) by applying the extended version of the CBFM for analyzing the radar cross section (RCS) of the array antenna. The method can be reduced memory usage of calculation compared with those of the direct MoM.
In this paper, we evaluated the hierarchical generation technique of characteristic basis function combined with singular value decomposition (SVD). This method enables us to analyze a scattering field with a high accuracy with small-scale matrix. By calculating the radar cross section (RCS) of a large conductor cylinder, we evaluated the technique. The(More)
In this paper the results of far-field RCS prediction from near-field data over the ground plane are presented in order to investigate the measurement range reduction. The near-field to far-field transformation techniques are adopted in Falconer DG (1988) and Inasawa Y et al. (1997). Some models are measured over the metal ground inside an indoor anechoic(More)
This paper presents the comparison of measured and theoretically predicted results of ground-wave propagation characteristic over a land-sea mixed-path at medium frequency (MF) band. One of techniques employed here is the theory given by Rotheram, and the other is the empirical formula for mixed-path problems developed by Millington. It is shown that the(More)
This paper describes the comparison of numerical and experimental results of the radiation and scattering characteristics of a tapered slot array antenna (TSA). The purpose of the comparison is to validate the effectiveness of a developed analysis technique based on the method of moments for broadband antennas. Since the radiation and scattering(More)