Broadband dual polarized base station antenna

Abstract

A dual polarized broadband base station antenna for wireless communication systems is disclosed. The present invention employs a dual polarized boxed arrangement radiation element with high isolation between polarization channels. Plural radiating elements project outwardly from the surface of a ground plane. The antenna elements are paired dipoles.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 a shows an isometric view of an example dual polarized radiation element with mirrored dipole pairs, in accordance with the present invention.

FIG. 1 b shows an isometric view of one of the dipole antennas in FIG. 1a, according to an embodiment of the present invention.

FIG. 1 c shows one of the dipole arms of the dipole antenna in FIG. 1b, according to an embodiment of the present invention

FIG. 1 d shows another one of the dipole arms of the dipole antenna in FIG. 1c, according to an embodiment of the present invention.

FIG. 2 shows an isometric view of plural dual polarized radiation elements configured on a ground plane in horizontal and vertical orientation, according to an embodiment of the present invention.

FIG. 3 shows an array of dipole pairs from the radiation elements in FIG. 2, having a common feed line, according to an embodiment of the present invention.

FIG. 4 shows another array of dipole pairs from the radiation elements in FIG. 2, having a common feed line, according to an embodiment of the present invention.

FIG. 5 shows the isometric view of a +45° dipole pair in the dual polarized radiation element of FIG. 1a, according to an embodiment of the present invention.

FIG. 6 shows the isometric view of a −45° dipole pair in the dual polarized radiation element of FIG. 1a, according to an embodiment of the present invention.

FIG. 7 a-c show how examples of using a clip to hold adjacent dipole antennas together, according to the present invention.

FIG. 8 a-d show a top view of four examples of box dipole arrangements, according to the present invention.

FIG. 9 shows an example 7/16 Din connector to microstrip line transition, according to the present invention.

Claims

1. An antenna assembly for receiving and/or transmitting electromagnetic signals, comprising: a dual polarized radiation element comprising a square arrangement of plural radiating elements;wherein the plural radiating elements form paired dipoles.

2. The antenna assembly of claim 1, wherein each radiating element comprises a dipole antenna.

3. The antenna assembly of claim 2, further comprising a ground plane wherein each dipole antenna projects outwardly from the ground plane.

4. The antenna assembly of claim 1 wherein each paired dipole comprises a pair of radiating elements with radiating arms in parallel configuration, wherein a common feed line pattern provides a common input to the paired dipole.

5. The antenna assembly of claim 4 wherein each radiation element includes two paired dipoles in a box configuration, wherein each paired dipole comprises a pair of radiating elements in parallel configuration, each paired dipole having a common feed line pattern providing a common input to that paired dipole.

6. The antenna assembly of claim 4 wherein the radiating elements are further oriented such that one paired dipole provides +45° polarization and another paired dipole provides −45° polarization.

7. The antenna assembly of claim 1 wherein the square arrangement of plural radiating elements provides better than 30 dB isolation between the polarization channels.

8. A broadband dual polarized base station antenna comprising: a ground section including a ground plane;communication means for dual polarized communication of signals with better than 30 dB level isolation between polarization channels;wherein said communication means projects outwardly from a surface of the ground plane.

9. The base station antenna of claim 8 wherein said communication means comprises at least one radiation element including a dual polarized square arrangement of plural radiating elements, wherein the plural radiating elements form paired dipoles.

10. The base station antenna of claim 9 wherein said at least one radiation element comprises plural radiation elements in arranged in a row.

11. The base station antenna of claim 9 wherein in each radiation element, the radiating elements are further oriented such that one paired dipole provides +45° polarization and another paired dipole provides −45° polarization, wherein the plural radiation elements are arrange in a row on the ground plane such that the radiation elements have parallel +45° polarization axis, and parallel −45° polarization axis.

12. The base station antenna of claim 8 wherein the communication means is configured for operating in the 806 to 960 MHz frequency band.

13. The base station antenna of claim 8 wherein the communication means is configured for operating in the 380 to 470 MHz frequency band.

14. The base station antenna of claim 8 wherein the communication means is configured for operating in the 1710 to 2170 MHz frequency band.

15. The base station antenna of claim 8 wherein the communication means is configured for operating in one or more of 380 to 470 MHz, 806 to 960 MHz, and 1710 to 2170 MHz frequency bands.

16. The base station antenna of claim 8 wherein the communication means is configured for operating in one or more of 2.3 GHz, 2.4 GHz, 2.5 GHz, 3.5 GHz and 5.8 GHz frequency bands.

17. An antenna assembly for receiving and/or transmitting electromagnetic signals, comprising: a ground plane;plural radiation elements, each radiation element comprising a square arrangement of plural radiating elements, wherein the plural radiating elements project outwardly from a surface of the ground plane, and the plural radiating elements form paired dipoles with a common feed line pattern;each radiating element comprising a dipole antenna including: a first conductor extending transversely from a surface of the ground plane and electrically connected to the ground plane, the first conductor comprising a first radiating arm projecting outwardly therefrom;a second conductor spaced from the ground plane by a dielectric and extending transversely relative to the surface of the ground plane, the second conductor comprising a second radiating arm projecting outwardly therefrom;wherein the first and second conductors are spaced from one another by a gap, and the first and second radiating arms project outwardly in essentially opposite directions.

18. The antenna assembly of claim 17 wherein the first and second radiating arms are essentially in the same plane.

19. The antenna assembly of claim 18 wherein each paired dipole comprises a pair of dipole antennas with radiating arms in parallel configuration and having a common feed line, each feed line comprising a microstrip feed line coupled to said first conductor, and spaced from said ground plane by an air dielectric.

20. The antenna assembly of claim 17 wherein in each radiation element, each paired dipole comprises a pair of radiating elements with radiating arms in parallel configuration, such that a common feed line pattern provides a common input to the paired dipole.

21. The antenna assembly of claim 20 wherein each radiation element includes two paired dipoles in a box configuration, wherein each paired dipole comprises a pair of radiating elements in parallel configuration, each paired dipole having a common feed line pattern providing a common input to that paired dipole.

22. The antenna assembly of claim 21 wherein in each radiation element, the radiating elements are further oriented such that one paired dipole provides +45° polarization and another paired dipole provides −45° polarization.

23. The antenna assembly of claim 17 wherein the radiation elements are arranged in a row.

24. The antenna assembly of claim 23 wherein the plural radiation elements are arranged in a row on the ground plane such that the radiation elements have parallel +45° polarization axis, and parallel −45° polarization axis.

25. The antenna assembly of claim 17 wherein the square arrangement of plural radiating elements provides better than 30 dB isolation between the polarization channels.

26. The antenna assembly of claim 17 wherein the first and second radiating arms are essentially in the same plane.

27. The antenna assembly of claim 26 wherein each paired dipole comprises a pair of radiating elements in parallel configuration having a common feed line, each feed line comprising a microstrip feed line coupled to said first conductor, and spaced from said ground plane by an air dielectric.

28. The antenna assembly of claim 26 wherein: the first conductor and the first radiating arm form an essentially L-shape; andthe second conductor and the second radiating arm form an essentially L-shape.

29. The antenna assembly of claim 26 wherein: the first conductor and the first radiating arm are formed from a sheet of conductive material; andthe second conductor and the second radiating arm are formed from a sheet of conductive material.

30. The antenna assembly of claim 26 wherein the first and second conductors are spaced in essentially parallel relationship, forming a balanced paired strips transmission line.

31. The antenna assembly of claim 30 wherein the impedance of the paired strips transmission line is adjusted by adjusting the width of the conductor and/or gap between the conductors.

32. The antenna assembly of claim 26 wherein the impedance of the feed line is adjusted to match input impedance of each radiating arm.

33. The antenna assembly of claim 32 wherein the impedance of the microstrip line is adjusted by adjusting the width of the microstrip line and/or the space between the microstrip line and the ground plane.