Antenna device and electronic equipment
An antenna device includes a first antenna having a length corresponding to a first frequency, and arranged along a ground, a second antenna formed by a slot penetrating metal constituting the first antenna, and having a slot length corresponding to a second frequency higher than the first frequency, a first feeder wire for the first frequency, connected from the ground to the first antenna, a metal element for electromagnetic field coupling, arranged in a non-contact state relative to the second antenna, between the slot and the ground; and a second feeder wire for the second frequency, connected from the ground to the metal element.
1. An antenna device comprising:
a first antenna having a length corresponding to a first frequency, and arranged along a ground;
a second antenna formed by a slot penetrating metal constituting the first antenna, and having a slot length corresponding to a second frequency higher than the first frequency;
a first feeder wire for the first frequency, connected from the ground to the first antenna;
a metal element for electromagnetic field coupling, arranged in a non-contact state relative to the second antenna, between the slot and the ground; and
a second feeder wire for the second frequency, connected from the ground to the metal element.
2. The antenna device according to claim 1 , wherein
the metal element is metal extending along a longitudinal direction of the slot.
3. The antenna device according to claim 1 , wherein
the first antenna has a length one fourth of a wavelength corresponding to the first frequency, and
the second antenna has a length one half of a wavelength corresponding to the second frequency.
4. The antenna device according to claim 1 , wherein
the metal element is arranged at a position closer to one side than another side from among two long sides forming an edge of an opening portion of the slot.
5. The antenna device according to claim 1 , wherein
the metal element has a monopole shape, in which the second feeder wire is connected to only one of both ends in a longitudinal direction thereof.
6. The antenna device according to claim 1 , wherein
the metal element has a loop shape.
7. The antenna device according to claim 1 , wherein
the second feeder wire is connected to the metal element near a center of the slot in a longitudinal direction thereof.
8. The antenna device according to claim 1 , wherein
the metal element has one end in the longitudinal direction at a position near the center of the slot in the longitudinal direction thereof.
9. The antenna device according to claim 1 , wherein
the metal element is connected to the second feeder wire via a rectification circuit.
10. The antenna device according to claim 1 , wherein
a dielectric material is filled in the slot.
11. The antenna device according to claim 1 , further comprising a third antenna arranged between the slot and the ground so that a main radiating direction thereof is oriented toward the slot.
12. Electronic equipment comprising the antenna device according to claim 1 .
13. The electronic equipment according to claim 12 , further comprising a housing partially formed of metal constituting the first antenna.