Antenna system

• US 9,780,456 B2
• Filed: 10/29/2015
• Issued: 10/03/2017
• Est. Priority Date: 04/30/2015
• Status: Active Grant

• Current Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Original Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Inventors: Tao, Yu
• Primary Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US14/926,404
• Publication Number:
  US 20160322709A1
• Time in Patent Office: 705 Days
• Field of Search: 343806
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 5/48 Combinations of two or more dipole type antennas
• CPC Class Codes: H01Q 9/065 Microstrip dipole antennas patch antenna H01Q9/0407

Abstract

An antenna system includes a first dipole antenna element and a second dipole antenna element. The first dipole antenna element includes a first feeding radiation element and a first grounding radiation element. The first feeding radiation element has an extension portion. The first grounding radiation element has an open slot. The extension portion extends into the interior of the open slot. The second dipole antenna element includes a second feeding radiation element and a second grounding radiation element. The first dipole antenna element and the second dipole antenna element are both excited by a signal source. The first dipole antenna element operates in a low-frequency band. The second dipole antenna element operates in a high-frequency band.

Claims

1. An antenna system, comprising:

a first dipole antenna element, comprising a first feeding radiation element and a first grounding radiation element, wherein the first feeding radiation element has an extension portion, the first grounding radiation element has an open slot, and the extension portion extends into an interior of the open slot;

a second dipole antenna element, comprising a second feeding radiation element and a second grounding radiation element;

a first meandering connection line; and

a first cascading radiation element, coupled through the first meandering connection line to the first feeding radiation element,

wherein the first dipole antenna element and the second dipole antenna element are both excited by a signal source, the first dipole antenna element operates in a low-frequency band, and the second dipole antenna element operates in a high-frequency band,

wherein a first feeding point on the first feeding radiation element and a second feeding point on the second feeding radiation element are both coupled to a positive electrode of the signal source, and a first grounding point on the first grounding radiation element and a second grounding point on the second grounding radiation element are both coupled to a negative electrode of the signal source.

2. The antenna system as claimed in claim 1, wherein each of the first feeding radiation element, the first grounding radiation element, the second feeding radiation element, and the second grounding radiation element substantially has a rectangular shape.

3. The antenna system as claimed in claim 1, wherein the extension portion substantially has a relatively narrow straight-line shape, and the open slot substantially has a relatively wide straight-line shape.

4. The antenna system as claimed in claim 1, wherein a length of the open slot is shorter than ⅛

wavelength of a central operating frequency of the low-frequency band.

5. The antenna system as claimed in claim 1, wherein spacing between the extension portion and an edge of the open slot is shorter than 1 mm.

6. The antenna system as claimed in claim 1, wherein the extension portion and the open slot are configured to prevent currents in the high-frequency band from affecting the first dipole antenna element.

7. The antenna system as claimed in claim 1, wherein the first feeding point is adjacent to the extension portion, and the first grounding point is adjacent to the open slot.

8. The antenna system as claimed in claim 1, wherein the extension portion is positioned at a first edge of the first feeding radiation element, the first meandering connection line is coupled to a second edge of the first feeding radiation element, and the first edge and the second edge of the first feeding radiation element are opposite to each other.

9. The antenna system as claimed in claim 1, wherein the first meandering connection line substantially has a combination of one or more W-shapes.

10. The antenna system as claimed in claim 1, wherein the first cascading radiation element substantially has a rectangular shape.

11. The antenna system as claimed in claim 1, wherein a length of the first meandering connection line is substantially equal to ½

wavelength of a central operating frequency of the low-frequency band.

12. The antenna system as claimed in claim 1, wherein a length of the first cascading radiation element is substantially equal to ½

wavelength of a central operating frequency of the low-frequency band.

13. The antenna system as claimed in claim 1, further comprising:

a coaxial cable, comprising a central conductive line and a conductive housing, wherein the positive electrode of the signal source is coupled through the central conductive line to the first feeding point and the second feeding point, and the negative electrode of the signal source is coupled through the conductive housing to the first grounding point and the second grounding point.

14. The antenna system as claimed in claim 13, further comprising:

a return current suppression element, coupled to the conductive housing, wherein the return current suppression element attracts currents from the conductive housing, so as to prevent the coaxial cable from generating radiation.

15. The antenna system as claimed in claim 14, wherein the return current suppression element substantially has an L-shape.

16. The antenna system as claimed in claim 14, wherein a length of the return current suppression element is substantially equal to ¼

wavelength of a central operating frequency of the low-frequency band.

17. The antenna system as claimed in claim 14, wherein spacing between the return current suppression element and the first dipole antenna element is from about 2 mm to about 3 mm.

18. The antenna system as claimed in claim 1, further comprising:

a second meandering connection line;

a second cascading radiation element, coupled through the second meandering connection line to the second feeding radiation element;

a third meandering connection line; and

a third cascading radiation element, coupled through the third meandering connection line to the second grounding radiation element.