Abstract: Provided is a client terminal device that is capable of wirelessly connecting to an access point that would offer high performance by reducing an influence of a connection history of the past, as well as such an access-point selection method and such a wireless LAN system. A load factor acquisition unit 22 acquires, a current load factor of each access point. A connection rate calculator 23 calculates a connection rate of the self terminal device to each access point. Based on the communication quality of a signal that a wireless communicator 21 has received from each access point, the load factor that the load factor acquisition unit 22 has acquired, and the connection rate that the connection rate calculator 23 has calculated, a controller 24 calculates priority with respect to each access point and selects connection with one of the access points based on the calculated priority.

Abstract: Provided is a client terminal device that is capable of wirelessly connecting to an access point that would offer high performance by reducing an influence of a connection history of the past, as well as such an access-point selection method and such a wireless LAN system. A load factor acquisition unit 22 acquires, a current load factor of each access point. A connection rate calculator 23 calculates a connection rate of the self terminal device to each access point. Based on the communication quality of a signal that a wireless communicator 21 has received from each access point, the load factor that the load factor acquisition unit 22 has acquired, and the connection rate that the connection rate calculator 23 has calculated, a controller 24 calculates priority with respect to each access point and selects connection with one of the access points based on the calculated priority.

Abstract: An antenna unit consists of an EBG reflector, a single curl antenna supported at a central portion of the EBG reflector, and a periodic structure upper plate disposed apart from a principal surface of the EBG reflector by a predetermined distance. The EBG reflector includes a substrate having the principal surface and (Nx×Ny) square patches which are printed on the principle surface of the substrate and which are arranged in a matrix fashion (lattice structure). The periodic structure upper plate consists of a film and (Nx×Ny) square patch-like conductors printed on the film. The (Nx×Ny) square patch-like conductors are disposed so as to oppose to the (Nx×Ny) square patches, respectively.

Abstract: An antenna unit consists of an EBG reflector, a single curl antenna supported at a central portion of the EBG reflector, and a periodic structure upper plate disposed apart from a principal surface of the EBG reflector by a predetermined distance. The EBG reflector includes a substrate having the principal surface and (Nx×Ny) square patches which are printed on the principle surface of the substrate and which are arranged in a matrix fashion (lattice structure). The periodic structure upper plate consists of a film and (Nx×Ny) square patch-like conductors printed on the film. The (Nx×Ny) square patch-like conductors are disposed so as to oppose to the (Nx×Ny) square patches, respectively.