Abstract:
A wireless communication device (50) includes a housing (51) and a first board (52) placed inside the housing (51). On the first board (52) there is mounted a first communication circuit (61a) and a first antenna (61b) that perform wireless communication based on a first wireless communication system that uses a first frequency band and a second communication circuit (62a) and a second antenna (62b) that perform wireless communication based on a second wireless communication system that uses the first frequency band and is different from the first wireless communication system. The first antenna (61b) and the second antenna (62b) are respectively placed in a first region and a second region that are in a diagonal spatial relationship in plan view of the first board (52).
Abstract:
Provide a sensor installation location determination support system and a sensor installation location determination support method that ensure accurate determination of sensor location information even in a case where a sensor to be installed is not equipped with GPS functionality. A sensor installation location determination support system includes a sensor detecting characteristic information of target object, a portable terminal communicatively coupled with the sensor for data communication, and a server collecting information.
Abstract:
An antenna element includes an antenna board, a radiation conductor including radiation portions including a top surface portion and being divided at positions corresponding to frequency bands and provided with respect to a first feeding point in plan view of the antenna board, through-conductors penetrating the antenna board at respective positions of end portions of the top surface portion in a thickness direction, and bottom surface electrodes provided on a bottom surface of the antenna board opposite the end portions of the top surface portion, and connected to the top surface portion via the through-conductors.
Abstract:
A data sequence to be transmitted is constituted by a data body and preceding data. The amount of preceding data is smaller than that of data body. If it is determined as a result of executing carrier sensing that a frequency band of radio waves to be transmitted is not being used by another contending communication system, the preceding data is transmitted after the lapse of a predetermined time. If it is determined as a result of executing carrier sensing after completion of transmitting of the preceding data that the frequency band is not being used by another contending communication system, the data body is transmitted after the lapse of a predetermined time. If it is determined that the frequency band is being used, the contention for the frequency band is avoided.
Abstract:
A circuit module provided with an auxiliary substrate includes a structure in which electronic components are mounted on a circuit substrate arranged at a bottom, an insulating resin covering the electronic components is defined so as to be higher than the electronic components, and the auxiliary substrate is arranged on the insulating resin. As a result, there has been a problem in that the height of the circuit module is increased. The circuit module is defined such that at least one of the electronic components is in contact with the auxiliary substrate.