Loaded antenna

• US 20060077101A1
• Filed: 04/13/2004
• Published: 04/13/2006
• Est. Priority Date: 10/16/2001
• Status: Active Grant

• Current Assignee: Fractus SA
• Original Assignee: Fractus SA
• Inventors: Soler Castany, Jordi, Puente Baliarda, Carles
• Granted Patent: US 7,312,762 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 15/0093 having a fractal shape
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A novel loaded antenna is defined in the present invention. The radiating element of the loaded antenna consists of two different parts: a conducting surface and a loading structure. By means of this configuration, the antenna provides a small and multiband performance, and hence it features a similar behaviour through different frequency bands.

Claims

1. A loaded antenna characterized in that a radiating element of the antenna includes at least two parts, a first part consisting of at least one conducting surface, a second part being a loading structure, said loading structure including at least a conducting strip, wherein at least one of said strips are connected at least at one point on the edge of said first conducting surface, and wherein the maximum width of said strip or strips is smaller than a quarter of the longest edge of first conducting surface.

2. A loaded antenna according to claim 1, wherein two tips of at least one of the conducting strips are connected at two points on the perimeter of said first conducting surface.

3. A loaded antenna according to claim 1 or 2 wherein said first conducting surface and second loading structure are lying on a common flat or curved surface.

4. A loaded antenna according to claim 1 comprising a conducting surface and at least a first and a second strip, wherein said first strip is connected at least at one point on the perimeter of said conducting surface, and wherein said second strip is connected at least by means of one of its tips to said first conducting strip.

5. A loaded antenna according to claim 1 wherein the antenna includes at least a second conducting surface, said second conducting surface featuring a smaller area than the first conducting surface, and wherein at least one conducting strip is connected to the first conducting surface at one end, and to the second conducting surface at another end

6. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the perimeter of said conducting surface is shaped as either a triangle, a square, a rectangle, a trapezoid, a pentagon, a hexagon, a heptagon, an octagon, a circle or an ellipse.

7. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein at least a portion of said conducting surface is a multilevel structure.

8. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the shape of at least one loading strip is a curve that includes a minimum of two segments and a maximum of nine segments which are connected in such a way that each segment forms an angle with an adjacent segment such that, no pair of adjacent segments define a larger straight segment.

9. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the loading structure includes at least one straight strip, said straight strip having one end connected to a point on an edge of said conducting surface.

10. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein at least one loading strip is shaped as a space-filling curve.

11. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein at least one loading strip is a straight strip with a polygonal shape.

12. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the loading structure includes at least two strips, and wherein a tip of a first one of the strips is free of connection.

13. A loaded antenna including a conducting surface and a loading structure according to claim 1 wherein the loading structure includes two or more strips connected at several points on a perimeter of said conducting surface.

15. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein a central portion of the conducting surface is removed.

16. A loaded antenna according to claim 1, wherein the antenna is a monopole, said monopole including a ground-plane or ground-counterpoise and a radiating element, said radiating element including at least a conducting surface and a loading structure.

17. A loaded antenna according to claim 1, wherein the antenna is a dipole including two arms, said arms including at least a conducting surface and a loading structure.

18. A loaded antenna according to claims 16 or 17 where the radiating element is printed on one side of a dielectric substrate and the load has a conducting surface on another side of the substrate.

19. A loaded antenna according to claim 1, wherein the antenna is a microstrip patch antenna and wherein a radiating patch of said antenna includes a conducting surface and a loading structure.

20. A loaded antenna according to claim 1, characterized in that the antenna features a multiband behavior, a broadband behavior or a combination of a multiband behavior and a broadband behavior.

21. A loaded antenna according to claim 1, characterized in that the antenna is shorter than a quarter of the central operating wavelength.

23. A loaded antenna according to claim 1, characterized in that the radiating element is used in at least one of the selective elements on a frequency selective surface.

24. A loaded antenna according to claim 1, characterized in that the geometry of the surface, the loading structure or both are shaped by an iterated function system mathematical algorithm, a multi-reduction copy machine mathematical algorithm, a networked multi-reduction copy machine mathematical algorithm, or a combination thereof.

25. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the loading structure includes at least two strips, and wherein a tip of a first one of the strips is connected to a second one of the strips.

26. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the loading structure includes at least two strips, and wherein both tips of a first one of the strips are connected to a second one or the strips.

27. A loaded antenna including a conducting surface and a loading structure according to claim 1, wherein the loading structure includes at least two strips, and wherein a first tip of a first one of the strips is connected to a second one of the strips and a second tip of the first one of the strips is connected to the conducting surface.

14. (canceled)

22. (canceled)