DESIGN METHOD OF ANTENNA DEVICE FOR MOBILE TERMINAL DEVICE AND ANTENNA DEVICE FOR MOBILE TERMINAL DEVICE

摘要

PROBLEM TO BE SOLVED: To adopt a meander shape as the structure of a multifrequency shared built-in antenna device in a mobile terminal device and also make it possible to adjust 3/4 wavelength harmonics in the antenna device to eliminate degradation of characteristics specific to the meander shape.;SOLUTION: A mobile terminal device according to an embodiment of the present invention sequentially undergoes such a design process in which, first, a step of acquiring a 1/4 wavelength resonance frequency range and then determining the resonance frequency range is executed, and, then, a subsequent step of adjusting the length of an element interval Whigh is executed, whereby an exact 1/4 wavelength resonance frequency range and an exact 3/4 wavelength resonance frequency range are both obtained. Furthermore, as for a method of adjusting the length of the element interval Whigh, only the respective element widths of two opposed linear antenna elements, which are parts of a U-shaped antenna element located at center of a meander-shaped antenna element, are expanded from their original element widths.;COPYRIGHT: (C)2013,JPO&INPIT