ANTENNA DEVICE AND PORTABLE RADIO COMMUNNICATION TERMINAL

摘要

The present invention relates to an antenna device and a mobile radio communication terminal adapted for improving the performance of an antenna. The antenna device includes a radio circuit 22 for transmitting and receiving a high-frequency signal, a notch antenna 23 having a feeder 25, and a notch antenna 24 operating through electromagnetic coupling with the notch antenna 23, and a substrate 21 independent of the radio circuit 22 with respect to high frequencies. The notch antenna 23 includes a linear slit having a length of lambda /4 and cut from one edge of the substrate 21 on the reverse side to the position of the radio circuit 22. The notch antenna 24 includes a linear slit having a length slightly shorter than lambda /4 and cut in parallel with the notch antenna 23 from the same edge thereof at a position spaced apart by a predetermined distance d from the notch antenna 23. The present invention is applicable to a mobile telephone.