Abstract: A leaky coaxial cable is arranged to meander on a ceiling of an indoor space where a wireless LAN is to be worked. One end of the leaky coaxial cable is connected to a wireless base station unit and the other end thereof is connected to a terminator. The wireless base station unit makes wireless communication with a wireless terminal unit through the leaky coaxial cable by modulation and demodulation in orthogonal frequency division multiplex modulation (OFDM).

Abstract: A leaky coaxial cable is arranged to meander on a ceiling of an indoor space where a wireless LAN is to be worked. One end of the leaky coaxial cable is connected to a wireless base station unit and the other end thereof is connected to a terminator. The wireless base station unit makes wireless communication with a wireless terminal unit through the leaky coaxial cable by modulation and demodulation in orthogonal frequency division multiplex modulation (OFDM).

Abstract: An RF tag reading apparatus reads information from RF tags affixed to postal envelopes by a single operation. An article container contains a large number of postal envelopes provided with RF tags. A reader antenna, which is connected to an interrogator via a coaxial cable, is disposed under the article container. Maximum gain directions of the RF tags of the respective postal envelopes are uniformly directed to the reader antenna. The respective postal envelopes contained in the article container are arranged face to face with each other in a direction orthogonal to the maximum directions of the RF tags. Since a maximum gain direction of the reader antenna is oriented toward a base end surface of the article container, the maximum gain directions of the RF tags are opposed to the maximum gain direction of the reader 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.

Abstract: An antenna for a radio base station has a leaky coaxial cable transmitting transmission power toward a terminator and transmitting received power toward an input terminal, a low-loss coaxial cable having a transmission loss per unit length smaller than that of the leaky coaxial cable, a first directional coupler having a function to pass the transmission power advancing to the terminator and a function to output the received power advancing toward the input terminal to the outside, a second directional coupler having a function to pass the transmission power advancing to the terminator and a function to bypass and output the received power advancing to the input terminal to the low-loss coaxial cable, and a power compositor inputting the received power output from the first directional coupler and the received power from the low-loss coaxial cable and outputting its composite power.

Abstract: An RF tag reading apparatus reads information from RF tags affixed to postal envelopes by a single operation. An article container contains a large number of postal envelopes provided with RF tags. A reader antenna, which is connected to an interrogator via a coaxial cable, is disposed under the article container. Maximum gain directions of the RF tags of the respective postal envelopes are uniformly directed to the reader antenna. The respective postal envelopes contained in the article container are arranged face to face with each other in a direction orthogonal to the maximum directions of the RF tags. Since a maximum gain direction of the reader antenna is oriented toward a base end surface of the article container, the maximum gain directions of the RF tags are opposed to the maximum gain direction of the reader antenna.

Abstract: An RF tag reading apparatus reads information from RF tags affixed to postal envelopes by a single operation. An article container contains a large number of postal envelopes provided with RF tags. A reader antenna, which is connected to an interrogator via a coaxial cable, is disposed under the article container. Maximum gain directions of the RF tags of the respective postal envelopes are uniformly directed to the reader antenna. The respective postal envelopes contained in the article container are arranged face to face with each other in a direction orthogonal to the maximum directions of the RF tags. Since a maximum gain direction of the reader antenna is oriented toward a base end surface of the article container, the maximum gain directions of the RF tags are opposed to the maximum gain direction of the reader antenna.

Abstract: A leaky coaxial cable is arranged to meander on a ceiling of an indoor space where a wireless LAN is to be worked. One end of the leaky coaxial cable is connected to a wireless base station unit and the other end thereof is connected to a terminator. The wireless base station unit makes wireless communication with a wireless terminal unit through the leaky coaxial cable by modulation and demodulation in orthogonal frequency division multiplex modulation (OFDM).

Abstract: When a shopping container put on a counter is moved on this counter, a bar code scanner reads a bar code from bar code holding means mounted on the shopping container and outputs it to a cash register.

Abstract: An electronic shelf label (ESL) transmits a negative response to a radio relay station by means of weak radio waves if it failed to normally receive price information. On the other hand, the ESL transmits no response if it failed to normally receive both ID information and price information. The radio relay station transmits to a radio communication base station ID information of the ESL which transmitted no response and ID information of the ESL which transmitted the negative response. The radio communication base station transfers the received ID information to an electronic shelf label (ESL) server. The ESL server re-transmits via the radio communication base station information to the ESL which transmitted no response and the ESL which transmitted the negative response.

Abstract: When a shopping container put on a counter is moved on this counter, a bar code scanner reads a bar code from bar code holding means mounted on the shopping container and outputs it to a cash register.

Abstract: When time service sale is carried out by using a shelf label, discount price and remaining time acquired by subtracting the current time from the discount ending time are indicated on the indicator of the shelf label. Moreover, estimated waiting time for customers at the register and allowance time d acquired by subtracting the estimated waiting time from the remaining time are indicated on the indicator. Therefore, customers can purchase time service sale commodities at a discount price with a time margin at the register in the store in a time zone in which time service sale is carried out.

Abstract: An electronic shelf label (ESL) transmits a negative response to a radio relay station by means of weak radio waves if it failed to normally receive price information. On the other hand, the ESL transmits no response if it failed to normally receive both ID information and price information. The radio relay station transmits to a radio communication base station ID information of the ESL which transmitted no response and ID information of the ESL which transmitted the negative response. The radio communication base station transfers the received ID information to an electronic shelf label (ESL) server. The ESL server re-transmits via the radio communication base station information to the ESL which transmitted no response and the ESL which transmitted the negative response.

Abstract: An automatic frequency control method for use in a receiver mixes a received signal and a local oscillator signal to produce an intermediate frequency signal and converts the intermediate frequency signal to a voltage signal. The voltage signal is converted to digital data which is then compared with a theoretical value, outputting frequency correction data which permits the difference between the digital data and the theoretical value to be minimized. The frequency of the local oscillator signal is controlled according to the frequency correction data so that the intermediate frequency signal becomes the normal frequency.