Low profile high polarization purity dual-polarized antennas

• US 6,310,584 B1
• Filed: 01/18/2000
• Issued: 10/30/2001
• Est. Priority Date: 01/18/2000
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Xircom Wireless Incorporated
• Inventors: Reece, John K., Aden, John L.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Alemu, Ephrem
• Application Number:
  US09/484,058
• Time in Patent Office: 651 Days
• Field of Search: 343/816, 343/812, 343/813, 343/814, 343/727, 343/829, 343/725, 343/795, 343/807
• US Class Current: 343/816
• CPC Class Codes: H01Q 21/062 using dipole aerials; H01Q21/067, H01Q21/068 take precedence
• 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 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

An antenna system for use in cellular and other wireless communication includes a dual polarized compact antenna array. In one embodiment, the antenna system includes four T-shaped dipole antenna elements mounted on a ground plane, forming a side of a square shaped array. In another embodiment, the antenna system includes seven T-shaped dipole antenna elements mounted on a ground plane to form two side by side square arrays, wherein the square arrays share a common T-shaped dipole antenna element.

Claims

1. A dual polarized antenna array comprising:

a ground plane;

a first and a second T-shaped dipole antenna element mounted along a first axis of the ground plane;

a third and a fourth T-shaped dipole antenna element mounted along a second axis of the ground plane wherein the first and second axes are mutually parallel,

a fifth, a sixth, and a seventh T-shaped dipole antenna element mounted along a third, a fourth, and a fifth axis, respectively, of the ground plane, wherein the third, fourth and fifth axes are mutually parallel with one another and orthogonal to the first and second axes, the sixth T-shaped dipole antenna element being positioned between the first and second T-shaped dipole antenna elements, and the first and second T-shaped dipole antenna elements being positioned between the fifth and seventh T-shaped dipole antenna elements;

a first power divider coupled to the first, second, third, and fourth T-shaped dipole antenna elements; and

a second power divider coupled to the fifth, sixth, and seventh T-shaped dipole antenna elements.

2. The antenna array of claim 1 wherein the ground plane comprises copper cladding deposited on a first side of a printed circuit board, and the first and second power dividers comprise copper cladding deposited on a second side of the printed circuit board to form microstrip line equal phase power dividers.

3. The antenna array of claim 1 wherein the first and second T-shaped dipole antenna elements are spaced apart 3.3 inches, the third and fourth T-shaped dipole antenna elements are spaced apart 3.3 inches, the first and third T-shaped dipole antenna elements being positioned broadside to one another, the second and fourth T-shaped dipole antenna elements being positioned broadside to one another, the first and second axes being spaced apart 3.3 inches, the fifth and sixth T-shaped dipole antenna elements being positioned broadside to one another and spaced apart 3.3 inches, and the sixth and seventh T-shaped dipole antenna elements being positioned broadside to one another and spaced apart 3.3 inches.

4. The antenna array of claim 3 further comprising a housing, the housing including:

a base providing a mounting for the ground plane and a mounting for a pair of coaxial connectors, one of the coaxial connectors being coupled to the first power divider, the other of the power dividers being coupled to the second power divider; and

a cover adapted to be coupled to the base.

5. The antenna array of claim 1 wherein each of the T-shaped dipole antenna elements comprise:

a stem having a base and a top;

a pair of laterally extending arms attached to the stem, each arm having a top edge and a bottom edge, wherein the bottom edge of each arm comprises a first arcuate segment having a radius R1 and a second arcuate segment having a radius R2 wherein R2 is greater than R1 and the first arcuate segment merges with a side edge of the stem; and

a reactive feed strip extending along the stem.

6. The antenna array of claim 5 wherein the top edge of each arn is aligned with the top of each stem, each stem having a longitudinally extending slot, each reactive feed strip extending along the stem by having a first, a second, and a third portion, the first portion extending from the base to an end of the first portion adjacent a first side of the slot, the third portion extending from an end of the third portion adjacent a second side of the slot towards the base, the second portion coupled between the ends of the first and third portions.

7. The antenna array of claim 6 wherein each first arcuate segment forms a quarter circle of radius R1.

8. The antenna array of claim 7 wherein R1 is 0.2 inches and R2 is 1.82 inches.

9. The antenna array of claim 8 wherein each slot has a width of 0.15 inches and extends longitudinally from the top of each stem a length of 0.95 inches.

10. The antenna array of claim 9 wherein the stem has a length of 1.97 inches.