Which waves use in the mobile?
To be able to make mobile phone calls, a mobile telephony network is needed. A major part of the network is built up of radio base stations, whose antennas send and receive radio signals to and from the mobile phones. To provide the required coverage the base stations are located at regular intervals according to a fixed pattern, just as street lamps are evenly spaced to light the way along a road. The area covered by a base station is called a cell, thereby the term cellular telephony used in many countries. As more and more people use mobile telephones, more base stations are required to handle the growing number of calls. Each base station can manage up to approximately 100 calls at a time in a cell. As the number of users increase the cells need to be smaller and the base stations are placed closer together, which increases the capacity of the network. In many countries third generation (3G) mobile telephony networks are being deployed in order to increase the capacity and to offer
