Tatsuya Kashiwa

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Abstract Inter-vehicle communication system using 720 MHz band to prevent car crashes at an intersection has been proposed in Japan recently. In this paper, the propagation characteristics at an intersection surrounded by concrete block walls in residential area were analyzed by using the FDTD method for the first time. We investigated the influence of wall(More)
In the radio propagation analysis, it is expected that the FDTD method becomes a counterpart of ray-tracing method by using the direction of arrival (DOA) estimation method. However, characteristics of DOA estimation in the FDTD analysis are not clear. In this paper, the accuracy of DOA estimation in the FDTD analysis of radio propagation using the multiple(More)
A novel way to compensate the distortion of Power Amplifier(PA) modules is presented in this paper. A diode linearizer with an inductor is used to compensate the distortion of the PA using LDMOS FET and has a characteristic of a positive phase and a gain expansion. Two diode-based linearizers are employed to compensate the distortions. One linearizer(More)
A pyramidal radiowave absorber is widely used for anechoic chamber. When high power equipment such as radar is measured in anechoic chamber, a risk that the absorber will catch fire occurs by absorbing the high power. In this paper, effects of incident angle on both electromagnetic absorption and temperature characteristics of a pyramidal radiowave absorber(More)