ANTENNA DEVICE

摘要

An antenna device includes a ground; a monopole antenna including a first section running from a feeding point along the ground, a second section running in a direction away from the ground, and a third section running along the ground, the monopole antenna having a length corresponding to ¼ of a wavelength at a first resonance frequency; a parasitic element including a first section whose end is connected to the ground in the vicinity of the end of the first section of the monopole antenna and that runs in a direction away from the ground, and a second section, the parasitic element having a length corresponding to ¼ of a wavelength at a second resonance frequency; and a dipole antenna provided along the third section of the monopole antenna and the parasitic element, the dipole antenna having a length corresponding to ½ of a wavelength at a third resonance frequency.

主权项

1. An antenna device comprising:
a ground element; a first monopole antenna element including a first section that is connected to a first feeding point provided on the ground element side and that runs along the ground element, a second section that runs from an end of the first section in a direction away from the ground element, and a third section that runs along the ground element from an end of the second section, the first monopole antenna element having a first length that corresponds to ¼ of a wavelength at a first resonance frequency; a parasitic element including a first section whose end is connected to the ground element in the vicinity of the end of the first section of the first monopole antenna element and that runs in a direction away from the ground element and a second section that runs along the third section of the first monopole antenna element from an end of the first section of the parasitic element, the parasitic element having a second length that corresponds to ¼ of a wavelength at a second resonance frequency; and a dipole antenna element provided along the third section of the first monopole antenna element and the parasitic element, the dipole antenna element having a third length that corresponds to ½ of a wavelength at a third resonance frequency.