Abstract: A radio tag communication apparatus that communicates with radio tags including storing units capable of storing identification information and state information of articles includes a search-condition setting unit for reading the state information, which is a search target, a radio tag communication unit configured to perform communication with the radio tag under a set search condition using a first reading function for reading the radio tag without designating the radio tag and a second reading function for designating the radio tag, setting a transmission output, and repeatedly reading the radio tag, a comparison determination unit configured to perform comparison determination of information read by the first reading function and the search condition, and communication control unit configured to control the radio tag communication unit according to result of the comparison determination to switch the reading operation by the first reading function to the reading operation by the second reading function.

Abstract: A radio tag communication apparatus that communicates with radio tags including storing units capable of storing identification information and state information of articles includes a search-condition setting unit for reading the state information, which is a search target, a radio tag communication unit configured to perform communication with the radio tag under a set search condition using a first reading function for reading the radio tag without designating the radio tag and a second reading function for designating the radio tag, setting a transmission output, and repeatedly reading the radio tag, a comparison determination unit configured to perform comparison determination of information read by the first reading function and the search condition, and communication control unit configured to control the radio tag communication unit according to result of the comparison determination to switch the reading operation by the first reading function to the reading operation by the second reading function.

Abstract: According to one embodiment, a wireless tag communication device which communicates with a wireless tag includes a communication unit that designates a target wireless tag to read tag information stored in the wireless tag; a read-state determination unit that determines a read state of the tag information read by the communication unit; an output adjustment unit that varies a radio wave output to be transmitted to the wireless tag in response to the result of the determination by the read-state determination unit; a signal strength detection unit that detects the signal strength of a reply signal received from the wireless tag via the communication unit; and a control unit that switches the operation mode of the communication unit between a long-distance mode to communicate with the wireless tag while the output adjustment unit varies the radio wave output and a near-field mode to communicate with the wireless tag while the signal strength detection unit detects the signal strength.

Abstract: According to one embodiment, a wireless tag communication device detects a communication state between an antenna and a specific wireless tag to be searched, stores a transmission power value obtained if the communication state is better than a predetermined value, reduces transmission power to the wireless tag and, if the communication state is worse than the predetermined value, increases, on the basis of the stored transmission power value, the transmission power to be higher than the transmission power value and performs communication with the wireless tag, and performs resetting on the basis of the stored transmission power value if the communication state further worsens.

Abstract: A wireless tag communication device which communicates with wireless tags storing identification information, includes a wireless tag communication unit that performs a reading of wireless tags by a first read function that does not designate the wireless tags and a second read function that designates the wireless tags, a comparison unit that compares information of the wireless tags that are stored in a storage unit with read information of the wireless tags and outputs a read result, a route information setting unit that sets designation order values of wireless tags present in a list of read objects but not read by the first read function, when the wireless tags are designated and read by the second read function, and an unread list generation unit that generates an unread list using at least a result read by the second read function.

Abstract: According to one embodiment, a wireless tag communication device which communicates with a wireless tag includes a communication unit that designates a target wireless tag to read tag information stored in the wireless tag; a read-state determination unit that determines a read state of the tag information read by the communication unit; an output adjustment unit that varies a radio wave output to be transmitted to the wireless tag in response to the result of the determination by the read-state determination unit; a signal strength detection unit that detects the signal strength of a reply signal received from the wireless tag via the communication unit; and a control unit that switches the operation mode of the communication unit between a long-distance mode to communicate with the wireless tag while the output adjustment unit varies the radio wave output and a near-field mode to communicate with the wireless tag while the signal strength detection unit detects the signal strength.

Abstract: A wireless tag communication device for communicating with a wireless tag through a directional antenna includes a wireless tag communication section configured to communicate with the wireless tag, a calculation section configured to estimate a direction range for communicating with the wireless tag based on transmission output power of the wireless tag communication device and an estimated reading distance to the wireless tag, and a display section configured to display the estimated direction range.

Abstract: A radio tag communication apparatus that communicates with radio tags including storing units capable of storing identification information and state information of articles includes a search-condition setting unit for reading the state information, which is a search target, a radio tag communication unit configured to perform communication with the radio tag under a set search condition using a first reading function for reading the radio tag without designating the radio tag and a second reading function for designating the radio tag, setting a transmission output, and repeatedly reading the radio tag, a comparison determination unit configured to perform comparison determination of information read by the first reading function and the search condition, and communication control unit configured to control the radio tag communication unit according to result of the comparison determination to switch the reading operation by the first reading function to the reading operation by the second reading function.

Abstract: According to one embodiment, an antenna switching system includes a (a?3) antennas and a selector. The selector selects b1 (2?b1<a) antennas out of the antennas at first timing, causes the selected antennas to configure an array antenna, selects, at second timing, b2 (2?b2<a) antennas including c (1?c<b1) antennas among the antennas used to configure the array antenna at the first timing out of the antennas, and causes the selected antennas to configure an array antenna.

Abstract: A communication antenna device for use in radio communication between a moving body and an access point comprises an antenna main body for transmitting and receiving a signal, a base side member of the moving body for supporting the antenna main body, and a damping mechanism provided between the base side member and the antenna main body and suppressing high frequency vibration of the antenna main body that has an impact on the radio communication. The damping mechanism includes an elastic member for absorbing high frequency vibration that has an impact on the radio communication. The elastic member has such characteristics as absorbing high frequency vibration of the antenna main body that makes changes in amplitude or frequency of a transmission signal from the antenna main body to the extent of inducing a demodulation error when the transmission signal is received at an antenna of the other party.

Abstract: According to one embodiment, an antenna switching system includes a (a?3) antennas and a selector. The selector selects b1 (2?b1<a) antennas out of the antennas at first timing, causes the selected antennas to configure an array antenna, selects, at second timing, b2 (2?b2<a) antennas including c (1?c<b1) antennas among the antennas used to configure the array antenna at the first timing out of the antennas, and causes the selected antennas to configure an array antenna.

Abstract: A wireless communication system which includes a wireless base station; a plurality of leaky transmission lines that function as antennas of the wireless base station; and a selector for selecting each of the leaky transmission lines and thereby connecting the leaky transmission lines to the wireless base station, wherein only one leaky transmission line is selected and connected at any given time. The selector may select all of the leaky transmission lines cyclically, one at any given time. Alternatively, the selector may select one of the leaky transmission lines according to a control signal from a selection controller.

Abstract: A communication antenna device for use in radio communication between a moving body and an access point comprises an antenna main body for transmitting and receiving a signal, a base side member of the moving body for supporting the antenna main body, and a damping mechanism provided between the base side member and the antenna main body and suppressing high frequency vibration of the antenna main body that has an impact on the radio communication. The damping mechanism includes an elastic member for absorbing high frequency vibration that has an impact on the radio communication. The elastic member has such characteristics as absorbing high frequency vibration of the antenna main body that makes changes in amplitude or frequency of a transmission signal from the antenna main body to the extent of inducing a demodulation error when the transmission signal is received at an antenna of the other party.

Abstract: One end of a balanced line is connected to a base station. A transmitting and receiving antenna is connected to the other end of the balanced line. The balanced line not only transmits a signal sent from the base station to the transmitting and receiving antenna and at the same time leaks a part of the transmitted signal as the radio waves, but also transmits the received signal at the transmitting and receiving antenna to the base station. In a room where the balanced line is laid, wireless communication terminals are provided. The wireless communication terminals transmit and receive radio waves to or from either the balanced line or the transmitting and receiving antenna.

Abstract: A diversity apparatus includes a transceiver, a phase shifter which switches phases of a carrier wave transmitted from the transceiver, and a leakage transmission path which transmits the carrier wave output from the phase shifter. The transceiver switches a phase of the phase shifter depending on a receiving level.

Abstract: A mobile communication terminal according to the present invention has a leaky transmission line whose radiation direction faces opposite a radiation direction of a part or a whole of the leaky transmission line of a wireless base station, as at least a part of an antenna element, connected to the communication terminal. Here, preferably, when a difference in angle between the radiation directions falls within the range between 180±7.5 degrees, the radiation directions are considered to face opposite each other. With this configuration, even when the leaky transmission line of the wireless base station has a curved line portion, a curved portion or the like, it is possible to ensure satisfactory communications with the wireless base station without a complicated configuration of the system but by a simple process to build the system.

Abstract: The present invention provides a wireless communication system includes a plurality of leaky transmission lines and sufficiently increases a wireless area. The present invention relates to a wireless communication system which includes a wireless base station; a plurality of leaky transmission lines that function as antennas of the wireless base station; and a selector for selecting each of the leaky transmission lines and thereby connecting the leaky transmission lines to the wireless base station, wherein only one leaky transmission line is selected and connected at any given time. The selector may select all of the leaky transmission lines cyclically, one at any given time. Alternatively, the selector may select one of the leaky transmission lines according to a control signal from a selection controller.

Abstract: One end of a balanced line is connected to a base station. A transmitting and receiving antenna is connected to the other end of the balanced line. The balanced line not only transmits a signal sent from the base station to the transmitting and receiving antenna and at the same time leaks a part of the transmitted signal as the radio waves, but also transmits the received signal at the transmitting and receiving antenna to the base station. In a room where the balanced line is laid, wireless communication terminals are provided. The wireless communication terminals transmit and receive radio waves to or from either the balanced line or the transmitting and receiving antenna.

Abstract: A wireless base station uses a leaky transmission line as an antenna, and a wireless base station uses a leaky transmission line as an antenna. The leaky transmission line and the leaky transmission line are laid parallel to each other. An interval between the leakage transmission paths is set to a distance at which it is impossible for the wireless base stations to sense each other's carrier while using a same wireless channel, and to be not more than twice as long as a maximum distance between leaky transmission lines, and wireless communication terminals at which it is possible for wireless base stations to respectively establish wireless links to wireless communication terminals.

Abstract: There is provided an antenna device used in a radio-communication between a radio communication apparatus and a data carrier within a short communication range. The antenna device comprises first and second leakage transmission lines, and a switch for selectively connecting the first and second transmission lines to the radio communication apparatus when carrying out the radio communication. The first transmission line has an opened end terminal. The second transmission line has a short-circuited end terminal. The first and second transmission lines are arranged in parallel and end terminals thereof are aligned.