Antenna structure
An antenna structure includes a radiation element, a grounding element, a short point, and a feeding point. The radiation element includes a first radiator and a second radiator. The second radiator partially surrounds the first radiator and there is a predetermined distance included between the first radiator and the second radiator for matching impedance. The short point is coupled between the second radiator and the grounding element. The feeding point is coupled between a joint point of the first radiator and the second radiator and the grounding element.
1. An antenna structure, comprising:
a radiation element, having a first radiator and a second radiator, wherein the second radiator partially surrounds the first radiator and there is a predetermined distance included between the first radiator and the second radiator for matching impedance;
a grounding element;
a short point, coupled between the second radiator and the grounding element;
a feeding point, coupled between a joint point of the first radiator and the second radiator and the grounding element; and
a third radiator, directly coupled to the feeding point, wherein there is a designated distance included between the third radiator and the second radiator for matching impedance.
2. The antenna structure of claim 1 , wherein the short point extends from the second radiator.
3. The antenna structure of claim 1 , wherein the second radiator comprises a plurality of sections, and a designated section of the plurality of sections overlaps the first radiator and is at a first designated distance from the first radiator in a designated direction, and the designated section is at a second designated distance from the grounding element in a direction opposite to the designated direction; and the designated section is parallel to the first radiator and located between the first radiator and the grounding element.
4. The antenna structure of claim 3 , wherein there is a fillister formed between the designated section of the second radiator, the short point, and the grounding element.
5. The antenna structure of claim 1 , wherein a length of the first radiator is approximately one-fourth of a wavelength (λ/4) of a first resonance mode generated by the antenna structure; a length of the second radiator is approximately one-fourth of a wavelength of a second resonance mode generated by the antenna structure; and a length of the third radiator is approximately one-fourth of a wavelength of a third resonance mode generated by the antenna structure.
6. The antenna structure of claim 1 , wherein the radiation element and the grounding element locate on an identical plane.
7. The antenna structure of claim 1 , wherein the radiation element and the grounding element locate on different planes.
8. The antenna structure of claim 7 , wherein the antenna structure presents a three-dimensional form.
9. An antenna structure, comprising:
a radiation element, having a first radiator and a second radiator, wherein there is a predetermined distance included between the first radiator and the second radiator for matching impedance; the second radiator comprises a plurality of sections, and a designated section of the plurality of sections overlaps the first radiator and is at a first designated distance from the first radiator in a designated direction, and the designated section is at a second designated distance from the grounding element in a direction opposite to the designated direction; and the designated section is parallel to the first radiator and located between the first radiator and the grounding element;
a grounding element;
a short point, coupled between the second radiator and the grounding element; and
a feeding point, coupled between a joint point of the first radiator and the second radiator and the grounding element;
wherein the first radiator, the second radiator, the short point, the grounding element, and the feeding point are disposed around along a sealed region.
10. The antenna structure of claim 9 , wherein the sealed region is a U type.
11. The antenna structure of claim 9 , wherein the short point extends from the second radiator.
12. The antenna structure of claim 9 , wherein there is a fillister formed between the designated section of the second radiator, the short point, and the grounding element.
13. The antenna structure of claim 9 , further comprising:
a third radiator, coupled to the feeding point, wherein there is a designated distance included between the third radiator and the second radiator for matching impedance;
a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure;
a length of the second radiator is approximately one-fourth of a wavelength of a second resonance mode generated by the antenna structure; and
a length of the third radiator is approximately one-fourth of a wavelength of a third resonance mode generated by the antenna structure.
14. The antenna structure of claim 9 , wherein the radiation element and the grounding element locate on an identical plane.
15. The antenna structure of claim 9 , wherein the radiation element and the grounding element locate on different planes.
16. The antenna structure of claim 15 , wherein the antenna structure presents a three-dimensional form.
17. An antenna structure, comprising:
a radiation element, having a first radiator and a second radiator, wherein there is a first predetermined distance included between the first radiator and the second radiator for matching impedance;
a third radiator, wherein there is a second predetermined distance included between the third radiator and the second radiator for matching impedance;
a grounding element; and
a feeding point, directly coupled between a joint point of the first radiator and the second radiator, and the third radiator and the grounding element.
18. The antenna structure of claim 17 , wherein the second radiator surrounds the first radiator.
19. The antenna structure of claim 18 , wherein the first radiator, the second radiator, the grounding element, and the feeding point are disposed around along a region with an S type shape.
20. An antenna structure, comprising:
a radiation element, having a first radiator and a second radiator, wherein there is a predetermined distance included between the first radiator and the second radiator for matching impedance;
a grounding element;
a short point, coupled between the second radiator and the grounding element; and
a feeding point, coupled between a joint point of the first radiator and the second radiator and the grounding element;
wherein the first radiator, the second radiator, the short point, the grounding element, and the feeding point are disposed around along a sealed region;
wherein the radiation element and the grounding element locate on an identical plane.