Antenna system

• US 9,837,724 B2
• Filed: 06/21/2016
• Issued: 12/05/2017
• Est. Priority Date: 03/01/2016
• Status: Active Grant

• Current Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Original Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Inventors: Jan, Cheng-Geng, Hsu, Chieh-Sheng
• Primary Examiner(s): DINH, TRINH VO
• Application Number:
  US15/188,475
• Publication Number:
  US 20170256863A1
• Time in Patent Office: 532 Days
• Field of Search: None
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 15/14 Reflecting surfaces; Equivalent structures electromagnetic shields H01Q1/526
• CPC Class Codes: H01Q 15/18 comprising plurality of mutually inclined plane surfaces, e.g. corner reflector H01Q15/16 takes precedence
• CPC Class Codes: H01Q 19/136 cross-polarised
• CPC Class Codes: H01Q 19/185 wherein the surfaces are plane
• CPC Class Codes: H01Q 19/28 using a secondary device in the form of two or more substantially straight conductive elements log- periodic antennas H01Q11/10; constituting a reflecting surface H01Q19/10
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

An antenna system includes a dual-polarized antenna, a main reflector, and an auxiliary reflector. The dual-polarized antenna includes a first antenna element and a second antenna element. The first antenna element and the second antenna element operate in a low-frequency band and a high-frequency band. The first antenna element and the second antenna element have different polarization directions. The main reflector is configured to reflect the electromagnetic waves in the low-frequency band. The auxiliary reflector is positioned between the dual-polarized antenna and the main reflector, and is configured to reflect the electromagnetic waves in the high-frequency band.

Claims

1. An antenna system, comprising:

a dual-polarized antenna, comprising a first antenna element and a second antenna element, wherein both the first antenna element and the second antenna element operate in a low-frequency band and a high-frequency band, and wherein the first antenna element and the second antenna element have different polarization directions;

a main reflector, reflecting electromagnetic waves in the low-frequency band; and

an auxiliary reflector, disposed between the dual-polarized antenna and the main reflector, and reflecting electromagnetic waves in the high-frequency band,

wherein the first antenna element is disposed on a first dielectric substrate, the second antenna element is disposed on a second dielectric substrate, and the second dielectric substrate is perpendicular to the first dielectric substrate.

2. The antenna system as claimed in claim 1, wherein the first antenna element has a first polarization direction, the second antenna element has a second polarization direction, and the second polarization direction is perpendicular to the first polarization direction.

3. The antenna system as claimed in claim 1, wherein the main reflector is a box without a lid, and a top opening of the box faces the dual-polarized antenna.

4. The antenna system as claimed in claim 1, wherein the auxiliary reflector is a plane.

5. The antenna system as claimed in claim 1, wherein the first antenna element and the second antenna element are dipole antenna elements or bowtie antenna elements.

6. The antenna system as claimed in claim 1, wherein each of the first antenna element and the second antenna element comprises a pair of first radiation elements, a pair of second radiation elements, and a pair of third radiation elements, and wherein the second radiation elements are disposed between the first radiation elements and the third radiation elements.

7. The antenna system as claimed in claim 6, wherein the first radiation elements and the second radiation elements are excited to generate electromagnetic wave in the low-frequency band, and wherein the third radiation elements are excited to generate electromagnetic wave in the high-frequency band.

8. The antenna system as claimed in claim 6, wherein each of the first antenna element and the second antenna element further comprises a pair of reflector elements for reflecting the electromagnetic waves in the high-frequency band, and wherein the reflector elements are disposed between the third radiation elements and the auxiliary reflector.

9. The antenna system as claimed in claim 6, wherein each of the first antenna element and the second antenna element further comprises a pair of director elements for directing the electromagnetic waves in the high-frequency band to transmit outwardly, and wherein the first radiation elements are disposed between the director elements and the second radiation elements.

10. The antenna system as claimed in claim 1, wherein each of the first antenna element and the second antenna element further comprises a signal source and a coaxial cable.

11. The antenna system as claimed in claim 10, wherein the coaxial cable comprises a conductive housing, and the conductive housing is soldered to the main reflector.

12. The antenna system as claimed in claim 11, wherein the auxiliary reflector has an opening, and the coaxial cable extends through the opening and does not directly touch the auxiliary reflector.

13. The antenna system as claimed in claim 12, wherein each of the first antenna element and the second antenna element further comprises a choke element.

14. The antenna system as claimed in claim 13, wherein the choke element is a low-pass filter.

15. The antenna system as claimed in claim 13, wherein the choke element is a hollow cylindrical tube which surrounds the coaxial cable.

16. The antenna system as claimed in claim 15, wherein the hollow cylindrical tube has an open end and a closed end, wherein the open end of the hollow cylindrical tube does not directly touch the coaxial cable, and wherein the closed end of the hollow cylindrical tube is soldered to the conductive housing of the coaxial cable.

17. The antenna system as claimed in claim 15, wherein a length of the hollow cylindrical tube is shorter than 0.25 wavelength of the high-frequency band.

18. The antenna system as claimed in claim 13, wherein the choke element is an L-shaped element, wherein the L-shaped element has a connection end and an open end, wherein the connection end of the L-shaped element is soldered to the conductive housing of the coaxial cable, and the open end of the L-shaped element does not directly touch the coaxial cable.