Patent ID: 7424308
Filing Date: 2008-09-09
Classification: H04B

Abstract:
1. A mobile terminal device able to communicate by a first data transmission system performing a diversity reception and a second data transmission system not performing the diversity reception, the mobile terminal device comprising: a first antenna; a second antenna; an antenna attachable and detachable portion, to which a third antenna is attached and from which the third antenna is detached; a first wireless circuit for performing communication using the first antenna or the third antenna; a second wireless circuit for performing communication using the second antenna; a third wireless circuit for performing communication using the first antenna or the third antenna; and an antenna switch, wherein the antenna switch switches the connection of the first wireless circuit to either the first antenna or the antenna attachable and detachable portion in response to a first control signal changing in a level in accordance with whether the third antenna is attached to or detached from the antenna attachable and detachable portion, switches to connect or to disconnect the second antenna to the second wireless circuit in response to a second control signal changing in a level in accordance with which transmission system of the first transmission system or the second transmission system is performed for the communication, and switches the connection of the third wireless circuit to either the first antenna or the antenna attachable and detachable portion, in response to a third control signal changing in a level in accordance with whether or not the communication using the third wireless circuit is performed.