Abstract: Provided is a leaky coaxial cable in which a plurality of slots 1 for forming a leak electromagnetic field are arranged in a string shape in an outer conductor of the coaxial cable. The pitch interval of the slots 1 is periodically changed in the axial direction. The periodical change of the pitch interval of a slot portion changes according to a sinusoidal function, a quadratic function, or other functions.

Abstract: Provided is a leaky coaxial cable in which a plurality of slots 1 for forming a leak electromagnetic field are arranged in a string shape in an outer conductor of the coaxial cable. The pitch interval of the slots 1 is periodically changed in the axial direction. The periodical change of the pitch interval of a slot portion changes according to a sinusoidal function, a quadratic function, or other functions.

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.