Abstract: A wireless device includes a distortion compensation unit that imparts a distortion compensation component to a radio signal and outputs the radio signal, an amplifier that amplifies the radio signal to which the distortion compensation component is imparted by the distortion compensation unit, and a signal-to-noise-ratio adjustment unit that deteriorates a signal to noise ratio of an output signal of the amplifier and outputs the output signal as a feedback signal, in which the distortion compensation unit estimates, from the feedback signal, a distortion component contained in the output signal of the amplifier and imparts the distortion compensation component having an inverse characteristic of the estimated distortion component to the radio signal.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An RF signal generation device includes an RF signal generation unit 102 that 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 converter 91 that converts the output signal from the RF signal generation unit 102 into an RF signal in which a smaller number of levels than the number of levels in the output signal; a driver unit 203 that converts the RF signal from the code converter 91 into a binary signal comprising plural bits in which bits corresponding to signal levels in the RF signal are significant; and a digital amplifier 303 that outputs a voltage corresponding to levels in the RF signal outputted from the code converter 91, on the basis of an output signal from the driver unit 203.

Abstract: An RF signal generation device includes an RF signal generation unit 102 that 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 converter 91 that converts the output signal from the RF signal generation unit 102 into an RF signal in which a smaller number of levels than the number of levels in the output signal; a driver unit 203 that converts the RF signal from the code converter 91 into a binary signal comprising plural bits in which bits corresponding to signal levels in the RF signal are significant; and a digital amplifier 303 that outputs a voltage corresponding to levels in the RF signal outputted from the code converter 91, on the basis of an output signal from the driver unit 203.

Abstract: A coating apparatus includes a liquid storing vessel in which coating liquid to be applied to a coating object is stored, and a film forming body that has an annular shape and includes an opening over which a film is stretched by immersing the film forming body in the coating liquid that is stored in the liquid storing vessel. In the coating apparatus, the film forming body is moved relatively to the coating object and the coating object is inserted into the opening over which the film is stretched, so as to apply the coating liquid on a surface of the coating object.