Nec Corporation

Japan Aviation Electronics Industry, Limited

Tatsuya Soma

Keishi Kosaka

An antenna includes a split-ring conductive portion and a ring-inside conductive portion. The split-ring conductive portion is positioned outside a region and is positioned in an area which extends along an outline of the region except for a split. The ring-inside conductive portion is positioned inside the region. The ring-inside conductive portion is continuous with one of parts of the split-ring conductive portion, the split being put between the parts of the split-ring conductive portion. At least a part of the ring-inside conductive portion is bent so as to extend parallel to the split-ring conductive portion.

Antenna and communication device

A wireless communication identification device includes a sensor unit configured to receive wireless signals from a plurality of wireless communication devices at a plurality of positions and to thereby detect the radio-waveform feature quantity and the radio-field intensity; a storage unit configured to store the radio-waveform feature quantity and the radio-field intensity as the history information; and a clustering part configured to apply a likelihood function including a correlation coefficient of the time-series radio-waveform feature quantity of wireless signals received at a plurality of positions to the history information and to thereby carry out clustering of the radio-waveform feature quantity for each wireless communication device serving as a transmission source of wireless signals.

Wireless communication identification device and wireless communication identification method

An RF signal generation device includes an RF signal generation unitthat pulse-modulates a prescribed signal to generate an output signal in which four or more-level discrete output levels appear and that a lowest level and any other level appear alternately; a code converterthat converts the output signal from the RF signal generation unitinto an RF signal in which a smaller number of levels than the number of levels in the output signal; a driver unitthat converts the RF signal from the code converterinto a binary signal comprising plural bits in which bits corresponding to signal levels in the RF signal are significant; and a digital amplifierthat outputs a voltage corresponding to levels in the RF signal outputted from the code converter, on the basis of an output signal from the driver unit

Growing community of inventors

Tokyo, Japan

Tatsuya Soma