Low profile high polarization purity dual-polarized antennas
First Claim
Patent Images
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.
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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.
86 Citations
10 Claims
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1. A dual polarized antenna array comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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.
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5. The antenna array of claim 1 wherein each of the T-shaped dipole antenna elements comprise:
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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.
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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.
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7. The antenna array of claim 6 wherein each first arcuate segment forms a quarter circle of radius R1.
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8. The antenna array of claim 7 wherein R1 is 0.2 inches and R2 is 1.82 inches.
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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.
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10. The antenna array of claim 9 wherein the stem has a length of 1.97 inches.
Specification