Claims
- 1. An antenna array, comprising:a ground plane; a first and a second T-shaped dipole antenna elements mounted along a first pair of mutually parallel axes of the ground plane; a third and a fourth T-shaped dipole antenna elements mounted along a second pair of mutually parallel axes of the ground plane orthogonal to the first pair of mutually parallel axes; a first power divider coupled to the first and second T-shaped dipole antenna elements; and a second power divider coupled to the third and fourth T-shaped dipole antenna elements.
- 2. The antenna array of claim 1, wherein:the first and second T-shaped dipole antenna elements are aligned to transmit and receive a first polarization; and the third and fourth T-shaped dipole antenna elements are aligned to transmit and receive a second polarization orthogonal to the first polarization.
- 3. The antenna array of claim 1, wherein:the ground plane includes a printed circuit copper cladding thereon; and the first and second power dividers include microstrip lines formed from copper cladding deposited on the printed circuit.
- 4. The antenna array of claim 1, each of the first, second, third, and fourth T-shaped dipole antenna elements comprising:a stem having a base, a top, and a pair of side edges; a pair of laterally extending arms attached to the stem, each of the pair of laterally extending arms having a top edge and a bottom edge, the bottom edge of each arm including a first arcuate segment merging with a corresponding side edge of the stem and having a radius R1, and a second arcuate segment having a radius R2 greater than R1; and a reactive feed strip extending along the stem.
- 5. The antenna array of claim 4, wherein the first arcuate segment forms a quarter circle.
- 6. The antenna array of claim 5, wherein:R1 is approximately 5 millimeters; and R2 is approximately 46 millimeters.
- 7. The antenna array of claim 4, wherein:the top edge of each of the pair of laterally extending arms is aligned with the top of stem; the stem has a longitudinally extending slot; and the reactive feed strip extends along the stem by having a first portion extending from the base to a first point a first side of the slot, a second extending from a second point adjacent a second side of the slot towards the base, and a third portion extending between the first point and the second point.
- 8. The antenna array of claim 7, wherein:wherein the stem has a length of approximately 50 millimeters; and the slot has a width of approximately 3.8 millimeters and extends longitudinally from the top of the stem a length of approximately 24 millimeters.
- 9. The antenna array of claim 8, wherein the first, second, third, and fourth T-shaped dipole antenna elements form a square array, in which:the first and second T-shaped dipole antenna elements are broadside to one another and spaced apart approximately 84 millimeters; and the third and fourth T-shaped dipole antenna elements are broadside to one another and spaced apart approximately 84 millimeters, the T-shaped dipole antenna elements thereby forming a square array.
- 10. The antenna array of claim 1, further comprising a housing, the housing including:a pair of coaxial connectors, a first one of the pair of coaxial connectors being coupled to the first power divider, and a second one of the pair of coaxial connectors being coupled to the second power divider; a base providing a mounting for the ground plane and a mounting for the pair of coaxial connectors; and a cover adapted to be coupled to the base.
Parent Case Info
This application is a continuation of U.S. patent application Ser. No. 09/484,058 filed on Jan. 18, 2000, now U.S. Pat. No. 6,310,584.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5771024 |
Reece et al. |
Jun 1998 |
A |
5771025 |
Reece et al. |
Jun 1998 |
A |
6121935 |
Reece et al. |
Sep 2000 |
A |
Continuations (1)
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Number |
Date |
Country |
Parent |
09/484058 |
Jan 2000 |
US |
Child |
09/891737 |
|
US |