Coupled Multiband Antennas

Patent metadata

Field	Value
Publication number	US-2015162666-A1
Application number	US-201514627785-A
Country	US
Kind code	A1
Filing date	Feb 20, 2015
Priority date	Sep 10, 2002
Publication date	Jun 11, 2015
Grant date	—

Abstract

An antenna includes at least two radiating arm structures made of or limited by a conductor, superconductor or semiconductor material. The two arms are coupled through a region on first and second superconducting arms such that the combined structure forms a small antenna with broadband behavior, multiband behavior or a combination thereof. The coupling between the two radiating arms is obtained via the shape and spatial arrangement thereof, in which at least one portion on each arm is placed in close proximity to each other (e.g., at a distance smaller than 1/10 of the longest free-space operating wavelength) to allow electromagnetic fields in one arm to be transferred to the other through close proximity regions. The proximity regions are spaced from the feeding port of the antenna (e.g., greater than 1/40 of the free-space longest operating wavelength) and specifically exclude the feeding port of the antenna.

First claim

What is claimed is:

1 . A wireless portable device comprising:
a printed circuit board comprising a ground plane structure; an antenna system operating in multiple frequency bands, the antenna system comprising:
a first radiating arm comprising a first-radiating-arm first tip, a first-radiating-arm second tip, and a feeding terminal connected to the first-radiating-arm first tip, wherein the first radiating arm is not connected to the ground plane through a grounding terminal; and
a second radiating arm comprising a second-radiating-arm first tip, a second-radiating-arm second tip, and a grounding terminal connected to the second-radiating-arm first tip; wherein the second radiating arm does not include a contact point with first radiating arm, wherein;
the first radiating arm and the second radiating arm are coupled through a close proximity region from a first specific portion of the first radiating arm and from a second specific portion of the second radiating arm;
a length of a line segment between a point of the first specific portion and a point of the second specific portion is shorter than a distance between the feeding terminal and the grounding terminal;
an orthogonal projection of the line segment onto a plane of the ground plane structure does not intersect the ground plane structure; and
the first radiating arm, the second radiating arm and the close proximity region are configured to simultaneously provide the bandwidth required for the antenna system to operate in the multiple frequency bands.

2 . The wireless portable device of claim 1 , wherein a folding of the first radiating arm is formed by a 90-degree angle.

3 . The wireless portable device of claim 1 , wherein the close proximity region is located at a distance from the feeding terminal longer than 1/40 of the longest free-space operating wavelength of the antenna system.

4 . The wireless portable device of claim 1 , wherein the first specific portion of the first radiating arm includes the first-radiating-arm second tip.

5 . The wireless portable device of claim 4 , wherein the first radiating arm and the second radiating arm form an open loop configuration.

6 . The wireless portable device of claim 5 , wherein a folding of the second radiating arm is formed by a 90-degrees angle.

7 . The wireless portable device of claim 6 , wherein a folding of the first radiating arm is formed by 90-degrees angle.

8 . The wireless portable device of claim 1 , wherein the first radiating arm is formed by using at least one inductive stub.

9 . The wireless portable device of claim 1 , wherein the first radiating arm comprises a portion formed by ten or more connected segments, each of the connected segments forming an angle with its neighboring connected segment, the angle being smaller than 180 degrees, and the segments being shorter than ⅛ of the longest free-space operating wavelength of the antenna system.

10 . The wireless portable device of claim 1 , wherein the first radiating arm and the second radiating arm are substantially coplanar.

11 . The wireless portable device of claim 1 , wherein the second radiating arm is formed by using at least one inductive stub.

12 . The wireless portable device of claim 1 , wherein the first specific portion of the first radiating arm and the second specific portion the second radiating arm are substantially coplanar.

13 . A wireless portable device comprising:
a printed circuit board comprising a ground plane structure; an antenna system operating in multiple frequency bands and included within the wireless portable device, the antenna system comprising:
a first radiating arm comprising a first-radiating-arm first tip, a first-radiating arm second tip, a feeding terminal connected to the first-radiating-arm first tip, and a first-radiating-arm first point; and
a second radiating arm comprising a second-radiating-arm first tip, a second-radiating-arm second tip, and a grounding terminal connected to the second-radiating-arm first tip, wherein;
the second radiating arm does not include a contact point with the first radiating arm;
the first radiating arm and the second radiating arm are coupled through a close proximity region formed by a portion including the first-radiating-arm first point and the second-radiating-arm second tip;
a length of a line segment between the first-radiating-arm first point and the second-radiating-arm second tip is shorter than a distance between a point of the feeding terminal and a point of the grounding terminal;
an orthogonal projection of the line segment onto a plane of the ground plane structure does not intersect the ground plane structure; and
the first radiating arm, the second radiating arm and the close proximity region are configured to simultaneously provide a bandwidth required for the antenna system to operate in the multiple frequency bands.

14 . The wireless portable device of claim 13 , wherein the second-radiating-arm comprises at least one inductive stub.

15 . The wireless portable device of claim 13 , wherein the close proximity region is located at a distance from the feeding terminal that is longer than 1 / 40 of the longest free-space wavelength of the antenna system.

16 . The wireless portable device of claim 13 , wherein the first radiating arm and the second radiating arm form an open loop configuration.

17 . The wireless portable device of claim 13 , wherein the second radiating arm is comprises at least one inductive stub.

18 . The wireless portable device of claim 17 , wherein the first radiating arm comprises at least one inductive stub.

19 . The wireless portable device of claim 13 , wherein first radiating arm comprises at least a portion formed by ten or more connected segments, each of the connected segments forming an angle with its neighboring connected segment, the angle being less than 180 degrees, and the segments being shorter than ⅛ of the longest free-space operating wavelength of the antenna system.

20 . The wireless portable device of claim 13 , wherein the first radiating arm and the second radiating arm substantially coplanar.

Assignees

• Fractus Sa

Inventors

• Puente Baliarda Carles
• Anguera Pros Jaume
• Soler Castany Jordi
• Condes Martinez Antonio

Classifications

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q1/36

  Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) · CPC title

• H01Q9/0414

  in a stacked or folded configuration · CPC title

• H01Q9/40

  Element having extended radiating surface · CPC title

• H01Q1/362 Primary

  for broadside radiating helical antennas · CPC title