Abstract: An antenna is disposed near a route of mobile object. A fixed tag is disposed at a location where a radio wave can be received from the antenna. When receiving a read command from the antenna, a mobile tag attached to the mobile object and the fixed tag send back a response signal at prescribed timing. A signal received from the fixed tag by the antenna is substantially constant. The signal from the fixed tag cannot be read while buried in a signal transmitted from the mobile tag to the antenna while the mobile tag is positioned at a location where communication with the antenna is expected. Conversely, when the mobile tag is at least a prescribed distance away from the antenna, the signal from the mobile tag cannot be read while buried in the signal from the fixed tag.

Abstract: Two antennas and an IC chip that independently operates the antennas are provided in a package of an RFID tag. Communication ranges A and B expanding in different directions when viewed from a front surface of the package are set by adjusting a directive characteristic of radio wave from each of the antennas. A reader/writer communicating with the tag selects one of the communication ranges A and B, and transmits a command including the identification information on the selected communication range. A control circuit in the IC chip executes the command on the condition that identification information included in the received command is matched with the antenna receiving the command, and returns response information through an antenna unit that receives the command.

Abstract: An RFID reader/writer includes a transmitter that transmits a transmitted signal to an RFID tag and a receiver that receives a received signal from the RFID tag based on the transmitted signal. The transmitter transmits a carrier wave. The RFID reader/writer includes a detector that detects a noise of the received signal received by the receiver, and a controller that controls the transmitter and the detector such that the detector detects the noise included in the received signal, when the detector outputs the carrier wave transmitted from the transmitter prior to the communication with the RFID tag.

Abstract: An antenna is disposed near a route of mobile object. A fixed tag is disposed at a location where a radio wave can be received from the antenna. When receiving a read command from the antenna, a mobile tag attached to the mobile object and the fixed tag send back a response signal at prescribed timing. A signal received from the fixed tag by the antenna is substantially constant. The signal from the fixed tag cannot be read while buried in a signal transmitted from the mobile tag to the antenna while the mobile tag is positioned at a location where communication with the antenna is expected. Conversely, when the mobile tag is at least a prescribed distance away from the antenna, the signal from the mobile tag cannot be read while buried in the signal from the fixed tag.

Abstract: In a transceiver that selectively transmits a modulated wave and a non-modulated wave to the outside, and receives a response signal from the outside, an S/N ratio during reception is improved. A transceiver, which selectively transmits a modulated wave and a non-modulated wave to the outside, and receives a response signal from the outside, includes an oscillator generating a predetermined carrier wave; a modulator modulating the carrier wave generated by the oscillator with a transmitted baseband signal to generate the modulated wave; a power amplifier amplifying the modulated wave being modulated by the modulator, or the non-modulated wave being not modulated by the modulator; and a circulator for sending output of the power amplifier to an antenna. When the non-modulated wave is transmitted from the antenna, switches are switched to a bypass circuit side such that the oscillator is directly connected to the power amplifier.

Abstract: In a transceiver that selectively transmits a modulated wave and a non-modulated wave to the outside, and receives a response signal from the outside, an S/N ratio during reception is improved. A transceiver, which selectively transmits a modulated wave and a non-modulated wave to the outside, and receives a response signal from the outside, includes an oscillator generating a predetermined carrier wave; a modulator modulating the carrier wave generated by the oscillator with a transmitted baseband signal to generate the modulated wave; a power amplifier amplifying the modulated wave being modulated by the modulator, or the non-modulated wave being not modulated by the modulator; and a circulator for sending output of the power amplifier to an antenna. When the non-modulated wave is transmitted from the antenna, switches are switched to a bypass circuit side such that the oscillator is directly connected to the power amplifier.

Abstract: In a transceiver that selectively transmits a modulated wave and a non-modulated wave to the outside, and receives a response signal from the outside, an S/N ratio during reception is improved. A transceiver, which selectively transmits a modulated wave and a non-modulated wave to the outside, and receives a response signal from the outside, includes an oscillator generating a predetermined carrier wave; a modulator modulating the carrier wave generated by the oscillator with a transmitted baseband signal to generate the modulated wave; a power amplifier amplifying the modulated wave being modulated by the modulator, or the non-modulated wave being not modulated by the modulator; and a circulator for sending output of the power amplifier to an antenna. When the non-modulated wave is transmitted from the antenna, switches are switched to a bypass circuit side such that the oscillator is directly connected to the power amplifier.

Abstract: An figure data input device is provided, by which prompt and accurate simulation learning is realized by automatically reading out type identifying data and location data of a figure piece when the piece figure is placed on a mounting board. The educational figure data input device includes a figure piece composed of a figure portion replicating the outward appearance of an object and a storage unit for storing the type of the figure portion, which are combined into one body; a mounting board provided with a plurality of sectional mounting planes in such a manner that one figure piece is placed on only one of the plurality of sectional mounting planes; and a reading device, incorporated in the mounting board, for reading out type identifying data stored in the storage unit of the figure piece placed on the mounting board.