Patent ID: 6628962
Filing Date: 2003-09-30
Classification: H01Q,H04B

Abstract:
A PDA use antenna device provided in a PDA unit which has at least a body and a wireless circuit for carrying out a data communication function and a telephone communication function, the PDA use antenna device comprising an antenna used in a first use condition and a second use condition, a first conforming circuit which conforms the impedance of said antenna to said first use condition as a function of positional orientation of said PDA unit, a second conforming circuit which conforms the impedance of said antenna to said second use condition as a function of positional orientation of said PDA unit, a control part which discriminates between said first use condition and said second use condition and outputs a discrimination signal, and a conforming circuit selection device which selects that one of said first conforming circuit and said second conforming circuit to use on the basis of the discrimination signal from said control part and connects said antenna to the wireless circuit through the selected conforming circuit.