Omni directional antenna with multiple polarizations

• US 20020158803A1
• Filed: 04/27/2001
• Published: 10/31/2002
• Est. Priority Date: 04/27/2001
• Status: Active Grant

• Current Assignee: Tyco Electronics Logistics AG (TE Connectivity Limited)
• Original Assignee: Matthew Commens
• Inventors: Hill, Robert, Johnson, Greg, Commens, Matthew H.
• Granted Patent: US 6,563,468 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/0464 Annular ring patch

Abstract

An omni-directional antenna assembly is provided for wireless communications devices requiring multiple polarization characteristics. An antenna assembly for a communications device operating at a predetermined wavelength and having a transceiver circuit including a signal output and a ground plane, the antenna assembly including a conductive planar element disposed away from the ground plane and a conductive leg member coupled to the planar element proximate a perimeter, the planar element being disposed a distance away from the ground plane of the communications device to define a region capable of receiving one or more components associated with the wireless communications device.

Claims

1. An antenna assembly for a wireless communications device operating at a predetermined operational wavelength and having a transceiver circuit including a signal port and a ground plane, said antenna assembly comprising:

a generally planar conductive loop element having an electrical length of approximately one half of the predetermined wavelength, said conductive loop element being disposed a predetermined distance away from the ground plane and in general parallel alignment with the ground plane to define a region between the loop element and the ground plane, said region sized to receive a component associated with the wireless communications device; and

a conductive feed structure coupled to the conductive loop element and extending toward the ground plane, said conductive feed structure having a feed point connection and a ground connection.

2. An antenna assembly according to claim 1, wherein the feed structure includes a leg member having an upper end and a lower end, said upper end being coupled to the loop element, said lower end being coupled to the ground plane at a ground connection location and the signal output at a feed point location, said leg member having a slot-like removed portion defined between the feed point location and the ground connection location.

3. An antenna assembly according to claim 1, wherein the feed structure includes a pair of conductive wires, a first wire defining the feed point connection and the other wire defining the ground connection.

4. An antenna assembly according to claim 1, wherein the feed structure includes an inductor and a capacitor coupled in parallel.

5. An antenna assembly according to claim 1, wherein the predetermined distance between the conductive loop element and the ground plane is between approximately 0.02 to 0.06 of the operational wavelength.

6. An antenna assembly according to claim 1, wherein the loop element has a generally rectangular cross section.

7. An antenna assembly according to claim 2, wherein the conductive leg member is generally planar and includes a feed tab at the feed point location and a grounding tab at the ground connection location.

8. An antenna assembly according to claim 2, wherein the conductive loop element and the conductive leg member are integrally formed from a single metal part.

9. An antenna assembly according to claim 1, further comprising:

a dielectric element disposed in the region between the loop element and the ground plane.

10. An antenna assembly according to claim 9, wherein the dielectric element is in contact with the loop element.

11. An antenna assembly according to claim 10, wherein the dielectric element includes an interior cavity capable of receiving the component associated with the wireless communications device.

12. An antenna assembly of claim 11, wherein the electronic component has a height dimension of approximately 50% of an interior cavity height dimension.

13. An antenna assembly of claim 12, wherein the electronic component includes a low noise amplifier having an output which is coupled to loop element proximate the feed point location.

15. An antenna assembly according to claim 14, wherein the feed structure includes a leg member having an upper end and a lower end, said upper end being coupled to the loop element, said lower end being coupled to the ground plane at a ground connection location and the signal output at a feed point location, said leg member having a slot-like removed portion defined between the feed point location and the ground connection location.

16. An antenna assembly according to claim 14, wherein the feed structure includes a pair of conductive wires, a first wire defining the feed point connection and the other wire defining the ground connection.

17. An antenna assembly according to claim 14, wherein the feed structure includes an inductor and a capacitor coupled in parallel.

18. An antenna assembly according to claim 15, wherein the predetermined distance between the loop element and the ground plane is between approximately 0.02 to 0.06 of the operational wavelength.

19. An antenna assembly according to claim 15, wherein the leg member is disposed in substantially perpendicular relationship to the loop element.

20. An antenna assembly according to claim 14, wherein the loop element has a generally rectangular cross section.

21. An antenna assembly of claim 14, wherein the loop element is generally circular.

22. An antenna assembly according to claim 15, wherein the conductive leg member is generally planar and includes a feed tab at the feed point location and a grounding tab at the ground connection location.

23. An antenna assembly according to claim 15, wherein the conductive loop element and the conductive leg member are integrally formed from a single metal part.

24. An antenna assembly according to claim 14, further comprising:

a dielectric element disposed in the region between the loop element and the ground plane.

25. An antenna assembly according to claim 24, wherein the dielectric element is in contact with the loop element.

26. An antenna assembly according to claim 24, wherein the dielectric element includes an interior cavity capable of receiving the component associated with the wireless communications device.

27. An antenna assembly of claim 26, wherein the component has a height dimension of approximately 50% of an interior cavity height dimension.

28. An antenna assembly of claim 27, wherein the electronic component includes a low noise amplifier having an output which is coupled to loop element proximate the feed point location.

29. An antenna assembly of claim 14, wherein the loop element is disposed on a side of the printed wiring board which faces away from a user during intended operation of the wireless communications device.

14. An antenna assembly for a wireless communications device including a printed wiring board having a signal output connection and a ground plane, said antenna assembly comprising:

a conductive loop element having an electrical length of approximately one half of a predetermined operational wavelength, said loop element being disposed in general parallel alignment with the ground plane, wherein a region is defined between the loop element and the ground plane, said region sized to receive a component associated with the wireless communications device; and

a conductive feed structure coupled to the conductive loop element and extending toward the ground plane, said conductive feed structure having a feed point connection and a ground connection.

30. An antenna assembly for a wireless communications device including a printed wiring board having a signal output connection and a ground plane, said antenna assembly comprising:

a substantially planar conductive element having an electrical length of approximately one half of a predetermined operational wavelength and being operatively coupled to the signal output connection, said element being disposed in general parallel alignment with the ground plane, wherein a region is defined between the conductive element and the ground plane, said region sized to receive a component associated with the wireless communications device; and

a conductive leg member having an upper end and a lower end, said upper end being coupled to the conductive element, said lower end being coupled to the ground plane at a ground connection location.

31. An antenna assembly according to claim 30, wherein the conductive leg member is coupled to the signal output connection at a feed point location, said leg member having a slot-like removed portion defined between the feed point location and the ground connection location.

32. An antenna assembly according to claim 30, wherein the predetermined distance between the conductive element and the ground plane is between approximately 0.02 to 0.06 of the operational wavelength.

33. An antenna assembly according to claim 30, wherein the leg member is disposed in substantially perpendicular relationship to the conductive element.

34. An antenna assembly according to claim 30, wherein the conductive element is a generally circular loop.

35. An antenna assembly according to claim 30, wherein the conductive leg member is generally planar and includes a feed tab at the feed point location and a grounding tab at the ground connection location.

36. An antenna assembly according to claim 30, further comprising:

a dielectric element disposed in the region between the conductive element and the ground plane.

37. An antenna assembly according to claim 36, wherein the dielectric element is in contact with the conductive element.

38. An antenna assembly according to claim 36, wherein the dielectric element includes an interior cavity capable of receiving the component associated with the wireless communications device.

39. An antenna assembly according to claim 38, wherein the component has a height dimension of approximately 50% of an interior cavity height dimension.

40. An antenna assembly according to claim 39, wherein the electronic component includes a low noise amplifier having an output which is coupled to conductive element proximate a feed point location.

41. An antenna assembly according to claim 30, wherein the conductive element is disposed on a side of the printed wiring board which faces away from a user during intended operation of the wireless communications device.