A first device in a group of devices is assigned a role of operating as a server node for the group of devices. Bisect de-embedding may be performed using a single substantially symmetric THRU structure, a first half of a first substantially symmetric THRU structure and a second half of a second substantially symmetric THRU structure, and by combining bisect de-embedding with conventionally known de-embedding techniques. In a mobile communication control apparatus for selecting one of the gateways, the load data communicated from each gateway is stored, and when receiving a request for obtaining the data stored in the information server from the mobile terminal, the apparatus selects a gateway based on the load data. The leakage flux element is separated from the coil by a region of relatively low magnetic permeability and positioned to provide a controlled path for leakage flux independent of coupling flux. A mobile enterprise server transmits the enterprise data to the client device.