ANTENNA DEVICE

摘要

Disclosed is an inverted F pattern antenna device which has a first antenna element (15) and an electrical length of 1/4 wavelength of a first resonance frequency. The antenna device, which has two resonance frequencies, is constructed by further providing a second antenna element (17) and a folded antenna element (16) at an end section of the first antenna element (15), and by setting a length which is the electrical length of the electrical lengths of the further provided antenna elements (16,17) added to the electrical length of the inverted F pattern antenna device as the electrical length of the 1/4 wavelength of a second resonance frequency to produce resonance at the second resonance frequency.