Dual-loop antenna and multi-frequency multi-antenna module

• US 8,344,950 B2
• Filed: 01/29/2010
• Issued: 01/01/2013
• Est. Priority Date: 09/15/2009
• Status: Active Grant

• Current Assignee: Lite-On Electronics Company Limited (Lite-On Technology Corporation)
• Original Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Inventors: Su, Saou-Wen
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US12/696,358
• Publication Number:
  US 20110063180A1
• Time in Patent Office: 1,068 Days
• Field of Search: 343/700.MS, 343/741, 343/742, 343/866, 343/867
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 15/14 Reflecting surfaces; Equivalent structures electromagnetic shields H01Q1/526
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

A dual-loop antenna includes a grounding unit, a shorting unit, a feeding unit, a first loop radiating unit and a second loop radiating unit. The shorting unit has at least one shorting pin disposed on the grounding unit. The feeding unit has at least one feeding pin separated from the shorting pin by a predetermined distance and suspended above the grounding unit at a predetermined distance. The first loop radiating unit is disposed above the grounding unit at a predetermined distance. The first loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit. The second loop radiating unit is disposed above the grounding unit at a predetermined distance and around the first loop radiating unit. The second loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit.

Claims

1. A dual-loop antenna, comprising:

a grounding unit;

a shorting unit having at least one shorting pin contacting the grounding unit;

a feeding unit having at least one feeding pin separated from the at least one shorting pin by a predetermined distance and suspended above the grounding unit at a predetermined distance;

a first loop radiating unit disposed above the grounding unit at a predetermined distance, wherein the first loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the first loop radiating unit provides a first operating frequency band; and

a second loop radiating unit disposed above the grounding unit at a predetermined distance and around the first loop radiating unit, wherein the second loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the second loop radiating unit provides a second operating frequency band;

a third loop radiating unit disposed above the grounding unit at a predetermined distance, wherein the third loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the third loop radiating unit corresponds to the first loop radiating unit; and

a fourth loop radiating unit disposed above the grounding unit at a predetermined distance and around the third loop radiating unit, wherein the fourth loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the fourth loop radiating unit corresponds to the second loop radiating unit;

wherein the first loop unit and the second loop unit are bent along with a line on a plane of the shorting unit and the feeding unit by a certain angle.

2. The dual-loop antenna according to claim 1, further comprising a signal wire, and one end of the signal wire electrically connected to the at least one feeding pin, wherein the grounding unit has a through hole formed on a central portion thereof, and another end of the signal wire passes through the through hole.

3. The dual-loop antenna according to claim 1, wherein the first loop radiating unit has a first radiating portion electrically connected to the feeding unit, a second radiating portion electrically connected to the shorting unit and a third radiating portion electrically connected between one end of the first radiating portion and one end of the second radiating portion, wherein the second loop radiating unit has a fourth radiating portion parallel to the third radiating portion and electrically connected to the feeding unit, a fifth radiating portion extended outwards from the fourth radiating portion and substantially parallel to the first radiating portion, a sixth radiating portion parallel to the third radiating portion and electrically connected to the shorting unit, a seventh radiating portion extended outwards from the sixth radiating portion and substantially parallel to the second radiating portion, and an eighth radiating portion electrically connected between one end of the fifth radiating portion and one end of the seventh radiating portion.

4. The dual-loop antenna according to claim 3, wherein the first, the second, the fifth and the seventh radiating portions are parallel to each other, and the third radiating portion and the eighth radiating portion are parallel to each other and separated from each other by a predetermined distance.

5. The dual-loop antenna according to claim 3, wherein the first radiating portion has a first bending section, and the second radiating portion has a second bending section corresponding to the first bending section, wherein the fifth radiating portion has a fifth bending section, and the seventh radiating portion has a seventh bending section corresponding to the fifth bending section.

6. The dual-loop antenna according to claim 1, further comprising an insulating body disposed on the grounding unit, wherein the shorting unit, the feeding unit, the first loop radiating unit and the second loop radiating unit are tightly adhered to an outer surface of the insulating body.

7. The dual-loop antenna according to claim 1, wherein the first loop radiating unit and the second loop radiating unit are substantially coplanar or non-coplanar.

8. The dual-loop antenna according to claim 1, wherein the first loop radiating unit and the second loop radiating unit are substantially horizontal to the grounding unit.

9. The dual-loop antenna according to claim 1, wherein the first loop radiating unit is divided into two portions by a center line thereof and the two portions of the first loop radiating unit are symmetrical, and the second loop radiating unit is divided into two portions by a center line thereof and the two portions of the second loop radiating unit are symmetrical.

10. The dual-loop antenna according to claim 1, wherein the two ends of the first loop radiating unit are respectively contacted to the shorting unit and the feeding unit, and the two ends of the second loop radiating unit are respectively contacted to the shorting unit and the feeding unit.

11. The dual-loop antenna according to claim 1, wherein the two ends of the first loop radiating unit are respectively contacted to the shorting unit and the feeding unit, and the two ends of the second loop radiating unit are respectively electrically connected to the shorting unit and the feeding unit via the first loop radiating unit.

12. The dual-loop antenna according to claim 1, wherein the two ends of the second loop radiating unit are respectively contacted to the shorting unit and the feeding unit, and the two ends of the first loop radiating unit are respectively electrically connected to the shorting unit and the feeding unit via the second loop radiating unit.

13. The dual-loop antenna according to claim 1, wherein the second loop radiating unit has two opposite sides bent downwards and symmetrically.

14. A multi-frequency multi-antenna module, comprising:

a grounding unit; and

a plurality of dual-loop structures surroundingly facing a geometric center of the grounding unit and disposed on the grounding unit, wherein two center lines of every two adjacent dual-loop structures intersect at the geometric center of the grounding unit to form an included angle and each of the included angles has substantial the same measure, and each dual-loop structure comprises;

a shorting unit having at least one shorting pin disposed on the grounding unit;

a feeding unit having at least one feeding pin separated from the at least one shorting pin by a predetermined distance and suspended above the grounding unit at a predetermined distance; and

a first loop radiating unit disposed above the grounding unit at a predetermined distance, wherein the first loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the first loop radiating unit provides a first operating frequency band; and

a second loop radiating unit disposed above the grounding unit at a predetermined distance and around the first loop radiating unit, wherein the second loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the second loop radiating unit provides a second operating frequency band.

15. The multi-frequency multi-antenna module according to claim 14, further comprising a plurality of signal wires respectively corresponding to the dual-loop structures, and one end of each signal wire electrically connected to the at least one feeding pin of each feeding unit, wherein the grounding unit has a through hole formed on a central portion thereof, and another end of each signal wire passes through the through hole, wherein the feeding unit of each dual-loop structure is adjacent to the shorting unit of one adjacent dual-loop structure, and the shorting unit of each dual-loop structure is adjacent to the feeding unit of another adjacent dual-loop structure.

16. The multi-frequency multi-antenna module according to claim 14, wherein the dual-loop structure is a one-wavelength loop structure.

17. The multi-frequency multi-antenna module according to claim 14, wherein the number of the dual-loop structures is three, and each included angle is 120 degrees.

18. A multi-frequency multi-antenna module installed in an antenna system housing, comprising:

a grounding unit; and

a plurality of dual-loop structures surroundingly facing a geometric center of the grounding unit and disposed on the grounding unit, wherein two center lines of every two adjacent dual-loop structures intersect at the a geometric center of the grounding unit to form an included angle and each of the included angles has substantial the same measure, and each dual-loop structure comprises;

a shorting unit having at least one shorting pin disposed on the grounding unit;

a feeding unit having at least one feeding pin separated from the at least one shorting pin by a predetermined distance and suspended above the grounding unit at a predetermined distance; and

a first loop radiating unit disposed above the grounding unit at a predetermined distance, wherein the first loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the first loop radiating unit provides a first operating frequency band; and

a second loop radiating unit disposed above the grounding unit at a predetermined distance and around the first loop radiating unit, wherein the second loop radiating unit has two ends respectively electrically connected to the shorting unit and the feeding unit, and the second loop radiating unit provides a second operating frequency band;

wherein the grounding unit and the dual-loop structures are enclosed by the antenna system housing.

19. The multi-frequency multi-antenna module according to claim 18, further comprising a plurality of signal wires respectively corresponding to the dual-loop structures, and one end of each signal wire electrically connected to the at least one feeding pin of each feeding unit, wherein the grounding unit has a through hole formed on a central portion thereof, and another end of each signal wire passes through the through hole.

20. The multi-frequency multi-antenna module according to claim 18, wherein the feeding unit of each dual-loop structure is adjacent to the shorting unit of one adjacent dual-loop structure, and the shorting unit of each dual-loop structure is adjacent to the feeding unit of another adjacent dual-loop structure.