Antenna, method of adjusting resonance frequency thereof, and wireless communication device

1. An antenna adaptable to a plurality of frequencies, comprising:

a first element that is connected to a feeding point for feeding, the first element being a bending unit including a plurality of element portions; and

a second element that is connected to a grounding point, the second element being arranged in proximity to the first element for coupling feeding with the first element, the second element being a bending unit including a plurality of element portions,

wherein the antenna is operated at a first frequency or a second frequency higher than the first frequency,

wherein the first element is set to a length resonated with the second frequency and has a resonance frequency higher than the second frequency,

wherein the second element is set to a length resonated with the first frequency and has a primary resonance frequency higher than the first frequency and a high-order resonance frequency in a vicinity of the second frequency, and

wherein the second element operates as a main radiating element at the first frequency, and both of the first element and the second element operate as radiating elements at the second frequency.

2. The antenna of claim 1 ,

wherein dipole antenna operation is performed by the first element and the second element at the second frequency.

3. The antenna of claim 1 ,

wherein the first element and the second element are arranged in three-dimension.

4. The antenna of claim 1 ,

wherein the second element is comprised of a turn-back portion, and an overlap portion with the first element, which is disposed in the turn-back portion, adjusts the second frequency.

5. The antenna of claim 1 ,

wherein the first element and the second element are installed within a housing of a wireless communication device.

6. A method of adjusting resonance frequency of an antenna adaptable to a plurality of frequencies, comprising:

forming a turn-back portion in a second element, made of a single conductor, by bending the second element, the second element being for coupling feeding with a first element connected to a feeding point, the first element being a bending unit including a plurality of element portions;

adjusting the first element to a length resonated with a second frequency higher than a first frequency and setting a resonance frequency higher than the second frequency;

adjusting the second element to a length resonated with the first frequency, and setting a primary resonance frequency higher than the first frequency and a high-order resonance frequency in the second frequency or the vicinity of the second frequency;

adjusting the second frequency by the turn-back portion; and

adjusting the second element so as to operate as a main radiating element at the first frequency, and both the first and second elements so as to operate as radiating elements at the second frequency.

7. A wireless communication device housing an antenna adaptable to a plurality of frequencies, comprising:

a first element that is connected to a feeding point for feeding, the first element being a bending unit including a plurality of element portions; and

a second element that is connected to a grounding point, the second element being arranged in proximity to the first element for coupling feeding with the first element, the second element being a bending unit including a plurality of element portions,

wherein the wireless communication device is operated at a first frequency or a second frequency higher than the first frequency,

wherein the first element is set to a length resonated with the second frequency and has a resonance frequency higher than the second frequency,

wherein the second element is set to a length resonated with the first frequency and has a primary resonance frequency higher than the first frequency and a high-order resonance frequency in the vicinity of the second frequency, and

wherein the second element operates as a main radiating element at the first frequency, and both the first and second elements operate as radiating elements at the second frequency.

8. The wireless communication device of claim 7 ,

wherein dipole antenna operation is performed by the first element and the second element at the second frequency.

9. The wireless communication device of claim 7 ,

wherein the first element and the second element are arranged in three-dimension.

10. The wireless communication device of claim 7 ,

wherein the second element is comprised of a turn-back portion, and an overlap portion with the first element, which is disposed in the turn-back portion, adjusts the second frequency.