Modified printed dipole antennas for wireless multi-band communications systems

• US 7,095,382 B2
• Filed: 06/03/2004
• Issued: 08/22/2006
• Est. Priority Date: 11/24/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Sandbridge Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Iancu, Daniel, Glossner, John, Surducan, Emanoil
• Primary Examiner(s): Dinh, Trinh Vo
• Application Number:
  US10/859,169
• Publication Number:
  US 20050110698A1
• Time in Patent Office: 810 Days
• Field of Search: 343/793, 343/795, 343/893
• US Class Current: 343/793
• 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 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 19/24 the primary active element being centre-fed and substantially straight, e.g. H-antenna
• 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 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A dipole antenna for a wireless communication device, which includes a first conductive element superimposed on a portion of and separated from a second conductive element by a first dielectric layer. A first conductive via connects the first and second conductive elements through the first dielectric layer. The second conductive element is generally U-shaped. The second conductive element includes a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape. Each strip is dimensioned for a different center frequency λ0. The first conductive element may be replaced by a coaxial feed directly to the second conductive element.

Claims

1. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

at least one of the strips on each leg being T-shape;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg;

a ground plane conductor superimposed and separated from the second conductive element by a second dielectric layer;

a third conductive element superimposed and separated from the strips of the second conductive element by the first dielectric layer; and

a second conductive via connecting the third conductive element to the ground conductor through the dielectric layers.

2. The antenna according to claim 1, wherein the first conductive element is L-shaped.

3. The antenna according to claim 2, wherein one of the legs of the L-shape is superimposed one of the legs of the U-shape.

4. The antenna according to claim 3, wherein the first conductive via connects the other leg of the L-shape to the other leg of the U-shape.

5. The antenna according to claim 2, wherein the first conductive via connects an end of one of the legs of the L-shape to one of the legs of the U-shape.

6. The antenna according to claim 1, wherein the first and second conductive elements are each planar.

7. The antenna according to claim 1, wherein each strip has a width less than 0.05 λ

o and a length of less than 0.5 λ

o.

8. The antenna according to claim 1, wherein the first and third conductive elements are co-planar.

9. The antenna according to claim 1, wherein the third conductive element includes a plurality of fingers superimposed a portion of lateral edges of each of the strips.

10. The antenna according to claim 1, wherein a first and last finger superimposed a first and last strip on each leg of the U-shape extend laterally beyond the lateral edges of the respective strips.

11. The antenna according to claim 1, wherein the permeability of the first dielectric layer is substantially greater than the permeability of the second dielectric layer.

12. The antenna according to claim 11, wherein the thickness of the first dielectric layer is substantially less than the thickness of the second dielectric layer.

13. The antenna according to claim 1, wherein the thickness of the first dielectric layer is at least half the thickness of the second dielectric layer.

14. The antenna according to claim 1, wherein the first dielectric layer is a substrate, and the first and second conductive elements are printed elements on the substrate.

15. The antenna according to claim 1, wherein the plurality of strips are parallel to each other.

16. The antenna according to claim 1, wherein at least one of the strips is generally shaped as a claw hammer.

17. A wireless communication device including the antenna of claim 1.

18. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

each strip extending from a leg being dimensioned for a different γ

o than another strip of the leg; and

a pair of conductive plates, each adjacent the strips of a leg of the U-shape at a pre-selected position.

19. The antenna according to claim 18, wherein the conductive plates position is adjustable.

20. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

one of the strips on each leg being T-shape;

one of strips on each leg including a trapezoidal shaped portion and a uniform width portion extending from the trapezoid shaped portion; and

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg.

21. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

one of the strips on each leg being T-shape;

one of the strips on each leg being adjacent the T-shaped strip and including a portion at an acute angle so as to be spaced adjacent the head of the T-shaped; and

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg.

22. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

one of the strips on each leg is T-shape having a base and a head;

one of the strips on each leg being adjacent the T-shaped strip, having an inverted L-shape, having a shorter length than the length of the base of the T-shaped strip, and extending from the leg of the U-shape below the head of the T-shaped strip; and

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg.

23. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

at least one of the strips on each leg being T-shape which includes a portion extending from one side of the head of the T-shape back towards the leg of the U-shape; and

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg.

24. A dipole antenna for a wireless communication device comprising:

a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;

a first conductive via connects the first and second conductive elements through the first dielectric layer;

the second conductive element being generally U-shaped;

the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg; and

at least one of the strips including a first portion extending transverse to the leg of the U-shape, and a second portion extending transverse to the first portion and a third portion extending into the first dielectric layer from the second portion.

25. A dipole antenna for a wireless communication device comprising:

a generally U-shaped first conductive element on a first dielectric layer;

the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

one of the strips on each leg being T-shaped;

one the of strips on each leg having a trapezoidal shaped portion and a uniform width portion extending from the step shaped portion;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg; and

a coaxial feed having inner and outer conductors, each connected to a leg of the U-shape.

26. The antenna according to claim 25, wherein the first dielectric layer is a substrate, and the first conductive element is printed on the substrate.

27. The antenna according to claim 25, wherein the plurality of strips are parallel to each other.

28. The antenna according to claim 25, wherein at least one of the strips is generally shaped as a claw hammer.

29. The antenna according to claim 25, including a second conductive element having first and second portions each superimposed the strips extending from one of the legs of the U-shape and separated there from by the first conductive layer.

30. A wireless communication device including the antenna of claim 25.

31. A dipole antenna for a wireless communication device comprising:

a generally U-shaped first conductive element on a first dielectric layer;

the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

one of the strips on each leg being T-shaped;

one of the strips on each leg being adjacent the T-shaped strip and including a portion at an acute angle so as to be spaced adjacent the head of the T-shaped;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg; and

a coaxial feed having inner and outer conductors, each connected to a leg of the U-shape.

32. A dipole antenna for a wireless communication device comprising:

a generally U-shaped first conductive element on a first dielectric layer;

the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

one of the strips on each leg being T-shaped and having a base and a head;

one of the strips on each leg adjacent the T-shaped strip being an inverted L-shape, having a shorter length than the length of the base of the T-shaped strip, and extending from the leg of the U-shape below the head of the T-shaped strip; and

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg.

33. A dipole antenna for a wireless communication device comprising:

a generally U-shaped first conductive element on a first dielectric layer;

the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

at lease one of the strips on each leg being T-shaped which includes a portion extending from one side of the head of the T-shape back towards the leg of the U-shape;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg; and

a coaxial feed having inner and outer conductors, each connected to a leg of the U-shape.

34. A dipole antenna for a wireless communication device comprising:

a generally U-shaped first conductive element on a first dielectric layer;

the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg;

a coaxial feed having inner and outer conductors, each connected to a leg of the U-shape; and

at least one of the strips including a first portion extending transverse to the leg of the U-shape, a second portion extending transverse to the first portion and a third portion extending into the first dielectric layer from the second portion.

35. A dipole antenna for a wireless communication device comprising:

a generally U-shaped first conductive element on a first dielectric layer;

the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;

each strip extending from a leg being dimensioned for a different λ

o than another strip of the leg;

a coaxial feed having inner and outer conductors, each connected to a leg of the U-shape; and

a pair of conductive plates, each adjacent the strips of a leg of the U-shape at a pre-selected position.

36. The antenna according to claim 35, wherein the conductive plates position is adjustable.