MOBILE COMMUNICATION DEVICE

摘要

A mobile communication device capable of sending data and receiving data at the same time, to enhance reception sensitivity when data is only received and transmission distortion characteristics when data is only sent, in the case of packet communication. The mobile communication device has an antenna switching unit (16) connected to an antenna (11). The antenna switching unit (16) comprises switches (21-24). When data is sent and received at the same time, for example, via packet communication, a sending side filter (12) and a receiving side filer (14), which form an antenna duplexer, are connected to the antenna (11). When there is no sending signal, the switches (21, 23) disconnect the sending system from the antenna (11) to prevent deterioration of the reception sensitivity. When there is no receiving signal, the switch (22) disconnects the receiving system from the antenna (11) to prevent deterioration of the transmission distortion characteristics.