Dipole antenna
A dipole antenna includes a first conductor, a second conductor, a first radiation element, and a second radiation element. The first conductor has a first feeding point. The second conductor has a second feeding point. The first radiation element is coupled to the first conductor. The second radiation element is coupled to the second conductor. The dipole antenna covers an operation frequency band. The first radiation element at least includes a first meandering structure. The first meandering structure is configured to suppress the frequency multiplication resonance with respect to the operation frequency band.
1. A dipole antenna, comprising:
a first conductor, having a first feeding point;
a second conductor, having a second feeding point;
a first radiation element, coupled to the first conductor; and
a second radiation element, coupled to the second conductor;
wherein the dipole antenna covers an operation frequency band;
wherein the first radiation element at least comprises a first meandering structure, and the first meandering structure is configured to suppress frequency multiplication resonance with respect to the operation frequency band;
wherein the second radiation element has a rectangular corner notch;
wherein the first radiation element is a symmetrical pattern, and the second radiation element is an asymmetrical pattern.
2. The dipole antenna as claimed in claim 1 , wherein the operation frequency band comprises frequency intervals from 2400 MHz to 2500 MHz and further from 5150 MHz to 5850 MHz.
3. The dipole antenna as claimed in claim 1 , wherein the first radiation element further comprises a first segment and a second segment, the first segment is coupled to the first conductor, and the first meandering structure is coupled between the first segment and the second segment.
4. The dipole antenna as claimed in claim 3 , wherein the first meandering structure comprises:
a first branch, coupled to the first segment;
a second branch, coupled to the second segment, wherein the first branch and the second branch substantially extend in opposite directions; and
a third branch, coupled between the first branch and the second branch.
5. The dipole antenna as claimed in claim 4 , wherein each of the first branch and the second branch substantially has a straight-line shape.
6. The dipole antenna as claimed in claim 4 , wherein a coupling gap is formed between the first branch and the second branch.
7. The dipole antenna as claimed in claim 6 , wherein a width of the coupling gap is determined as follows:
WC
1
<
1
1
6
5
·
λ
where “WC1” represents the width of the coupling gap, and “λ” represents a wavelength of a target frequency of the operation frequency band.
8. The dipole antenna as claimed in claim 4 , wherein the third branch comprises a plurality of W-shapes.
9. The dipole antenna as claimed in claim 4 , wherein a length of the first segment is determined as follows:
L
1
=
1
8
·
λ
·
k
where “L1” represents the length of the first segment, “λ” represents a wavelength of a target frequency of the operation frequency band, and “k” represents an error coefficient from 0.8 to 1.2.
10. The dipole antenna as claimed in claim 4 , wherein a length of the first branch is determined as follows:
L
2
=
1
1
2
·
λ
·
k
where “L2” represents the length of the first branch, “λ” represents a wavelength of a target frequency of the operation frequency band, and “k” represents an error coefficient from 0.8 to 1.2.
11. The dipole antenna as claimed in claim 4 , wherein a length of the second branch is determined as follows:
L
3
=
1
1
2
·
λ
·
k
where “L3” represents the length of the second branch, “λ” represents a wavelength of a target frequency of the operation frequency band, and “k” represents an error coefficient from 0.8 to 1.2.
12. The dipole antenna as claimed in claim 4 , wherein a length of the third branch is determined as follows:
L
4
=
1
5
·
λ
·
k
where “L4” represents the length of the third branch, “λ” represents a wavelength of a target frequency of the operation frequency band, and “k” represents an error coefficient from 0.8 to 1.2.
13. The dipole antenna as claimed in claim 1 , wherein the second radiation element comprises a third segment, a fourth segment, and a second meandering structure, the third segment is coupled to the second conductor, and the second meandering structure is coupled between the third segment and the fourth segment.
14. The dipole antenna as claimed in claim 1 , wherein the operation frequency band is from 617 MHz to 7125 MHz.
15. The dipole antenna as claimed in claim 1 , wherein the first conductor substantially has a V-shape, and the second conductor substantially has a straight-line shape extending into a notch of the first conductor.
16. The dipole antenna as claimed in claim 1 , wherein the first radiation element further comprises a second meandering structure.
17. The dipole antenna as claimed in claim 16 , wherein the first radiation element further comprises a first segment, a second segment, a third segment, and a fourth segment, the first segment is coupled to a first connection point on the first conductor, the third segment is coupled to a second connection point on the first conductor, the first meandering structure is coupled between the first segment and the second segment, and the second meandering structure is coupled between the third segment and the fourth segment.
18. The dipole antenna as claimed in claim 17 , wherein a length and a width of the second segment are much greater than those of the first segment, and a length and a width of the fourth segment are much greater than those of the third segment.