Dual antenna apparatus and methods

• US 20080204328A1
• Filed: 01/15/2008
• Published: 08/28/2008
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: Pulse Finland Oy (Yageo Corporation)
• Original Assignee: Pulse Finland Oy (Yageo Corporation)
• Inventors: Nissinen, Pertti
• Granted Patent: US 8,179,322 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• 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 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

A dielectric dual antenna apparatus intended for applications such as small-sized radio frequency devices. The dual antenna comprises a first partial antenna which implements the lower operating band of the antenna and another partial antenna implementing the upper operating band. The partial antennas have a shared substrate, which together with the radiators constitutes an integrated antenna component. The matching of the dual antenna can be improved in either operating band without degrading it in the other operating band at the same time. Methods of operating the aforementioned apparatus are also disclosed.

Claims

1. A dual band antenna comprising:

a substrate comprising a width and a length, said substrate further comprising;

a first antenna operating at a first operating band; and

a second antenna operating at a second operating band, said second operating band substantially differing from said first operating band;

wherein said first antenna and said second antenna share a feed point and a feed conductor, and at least one of said first or second antennas comprises a first radiator and a second radiator, and at least one of said antennas comprises a third radiator; and

wherein said first radiator comprises said feed point and said second radiator comprises a first end and a second end, said second end coupled to a ground and disposed farther from said first radiator than said first end.

2. The antenna of claim 1, wherein said length is larger than said width, and said first radiator further comprises at least one short circuit point and at least one short circuit conductor associated therewith, the distance between said at least one short circuit point and said feed point being no larger than said width.

3. The dual band antenna of claim 2, wherein the number of said at least one short circuit points is one, said short-circuit conductor located on a back surface of said substrate opposite a front surface comprising said feed conductor.

4. The dual band antenna of claim 2, wherein the number of said at least one short circuit points is one, said short-circuit conductor located on the same surface as said feed conductor.

5. The dual band antenna of claim 2, wherein the number of said at least one short circuit points is two, and wherein a first short-circuit conductor comprising a first short-circuit point is located on the same surface of the substrate as the feed conductor, and a second short-circuit conductor comprising a second short-circuit point is located on the same surface of the substrate as the feed conductor and on the opposite side of the feed conductor as said first short-circuit conductor.

6. The dual band antenna of claim 2, wherein the number of said at least one short circuit points is two, wherein a first short-circuit conductor comprising a first short-circuit point is located on the same surface of the substrate as the feed conductor and a second short-circuit conductor comprising a second short-circuit point is located on a surface of the substrate opposite the feed conductor and said first short-circuit conductor.

7. The dual band antenna of claim 1, wherein said first and second radiators are separated from each other by a narrow slot.

8. The dual band antenna of claim 7, wherein the first radiator is wholly located on an upper surface of the substrate.

9. The dual band antenna of claim 7, wherein at least one of the first or second radiators extends from an upper surface of the substrate to a front or a back surface.

10. The dual band antenna of claim 9, wherein a majority of the second radiator is located on the back surface of the substrate.

11. The dual band antenna of claim 7, wherein the majority of the slot separating the first and second radiators is located on an upper surface of the substrate.

12. The dual band antenna of claim 11, wherein the third radiator comprises a meandering shape.

13. The dual band antenna of claim 1, further comprising a reactive matching component electrically disposed between the feed conductor and a signal ground.

14. The dual band antenna of claim 1, wherein said substrate comprises a ceramic material.

16. The method of claim 14, wherein one of said lower and upper bands comprises a global positioning system (GPS) band, and the other of said lower and upper bands comprises a wireless local area network (WLAN) band.

39. The dual antenna according to claim 1, wherein said at least one short-circuit point comprises a single point, and a short-circuit conductor communicating with said single point is located in majority on the front surface of the substrate on at least one side of the feed conductor.

40. A dual antenna according to claim 1, wherein said at least one point comprises first and second points, and a first short-circuit conductor communicating with the first short-circuit point is located substantially on the front surface of the substrate on one side of the feed conductor, and a second short-circuit conductor communicating with the second short-circuit point is located substantially on the front surface of the substrate on the other side of the feed conductor.

15. A method of operating a dual band antenna comprising one partial antenna associated with a lower operating band of the antenna and a second partial antenna associated with an upper operating band, said partial antennas having a shared substrate, a shared feed point, wherein said method comprises:

operating at least one of the partial antennas as two radiators;

operating said first radiator and the radiator of the other partial antenna, which joins the shared feed point, as a unitary common element on the substrate surface; and

short-circuiting said common element to ground from at least one point proximate to the feed point.

17. An antenna component for use in a radio frequency device comprising:

a first partial antenna implementing a lower operating band; and

a second partial antenna implementing an upper operating band, said first and second partial antennas comprising a shared dielectric substrate;

wherein the first and second partial antennas comprise a shared feed point and a shared feed conductor disposed on a front surface of the substrate.

18. The antenna component of claim 17, wherein a part of the antenna component in a first direction relative to a cross-section of the substrate which leads through the feed point is associated with the first partial antenna, and a part of the antenna component in the opposite direction is associated with the second partial antenna.

19. The antenna component of claim 18, wherein at least one of said first or second partial antennas comprises two radiators, the first of which joins galvanically at the feed point, and the second of which is connected to a ground plane from an outer end;

and wherein said first radiator and a radiator of the other partial antenna joining the shared feed point form a unitary common element on the upper surface of the substrate.

20. The antenna component of claim 19, wherein said unitary common element is connected to the ground plane from at least one short-circuit point proximate to the feed point.

21. The antenna component of claim 20, wherein said at least one short-circuit point comprises one point of the unitary common element, and further comprising a short-circuit conductor in communication with said one point and located on a back surface of the substrate opposite the feed conductor.

22. The antenna component of claim 20, further comprising a short-circuit conductor starting from said at least one point and located on the front surface of the substrate.

23. The antenna component of claim 20, wherein said at least one short-circuit point of the common element comprises first and second points, and said component further comprises a first short-circuit conductor starting from said first short-circuit point and located at least partly on the front surface of the substrate on one side of the feed conductor, and a second short-circuit conductor starting from said second short-circuit point located at least partly on the front surface of the substrate on the other side of the feed conductor than said first short-circuit conductor.

24. The antenna component of claim 20, wherein said at least one short-circuit point comprises first and second points, and further comprises a first short-circuit conductor communicating with the first short-circuit point and located on the front surface of the substrate next to the feed conductor, and a second short-circuit conductor communicating with said second short-circuit point and located on a back surface of the substrate opposite the feed conductor.

25. The antenna component of claim 19, wherein the first radiator which joins galvanically at the feed point and the second radiator comprises the first partial antenna, said first and second radiator being separated from each other by a slot, said second radiator extending through a first surface of the substrate to a lower surface of the substrate for connection to the ground plane.

26. The antenna component of claim 25, wherein the first radiator of the first partial antenna is wholly located on the upper surface of the substrate.

27. The antenna component of claim 22, wherein at least one of the radiators of the first partial antenna extends from the upper surface of the substrate to at least one of a front or a back surface.

28. The antenna component of claim 27, wherein a majority of the second radiator of the first partial antenna is located on the back surface of the substrate.

29. The antenna component of claim 25, wherein the second partial antenna comprises two radiators separated from each other by a slot, a first radiator of which joins galvanically the feed point, and the second radiator of the second partial antenna extending through a second surface of the substrate to a lower surface of the substrate for connection to the ground plane.

30. The antenna component of claim 29, wherein the slot is substantially located on the upper surface of the substrate.

31. The antenna component of claim 29, wherein the first and second radiator of the second partial antenna and the slot between these radiators extend from the upper surface of the substrate to its back surface.

32. The antenna component of claim 29, wherein the slot between the first and second radiator of the second partial antenna is located on a second head surface of the substrate.

33. The antenna component of claim 25, wherein the second partial antenna comprises only one radiator which covers at least a part of the upper surface of the substrate.

34. The antenna component of claim 33, wherein the radiator of the second partial antenna is meander-shaped.

35. The antenna component of claim 17, further comprising a reactive matching component connected between an antenna feed conductor and a signal ground.

36. The antenna of claim 17, wherein said shared substrate comprises a ceramic material.

37. A dual antenna of a radio device comprising:

a first partial antenna to implement a lower operating band of the antenna;

a second partial antenna to implement an upper operating band, said first and second partial antennas having a shared dielectric substrate which forms an integrated antenna component together with antenna radiators, the partial antennas having a shared feed point and a shared feed conductor on the front surface of the substrate;

wherein a part of the antenna component in one direction from a substrate cross section which leads through the feed point belongs to the first partial antenna, and a part of the antenna component in the opposite direction belongs to the second partial antenna;

wherein at least one partial antenna comprises two radiators, the first of which joins the feed point and the second of which is adapted for connection to a ground plane; and

wherein said first radiator and a radiator of the other partial antenna joining the shared feed point form a unitary common element on the upper surface of the substrate, which element is configured for connection to the ground plane from at least one short-circuit point proximate to the feed point.

38. The dual antenna according to claim 37, wherein said at least one said short-circuit point comprises a single point, and said antenna further comprises a short-circuit conductor communicating with said single point is located on back surface of the substrate substantially opposite the feed conductor.

41. An integrated dual-band antenna, comprising:

at least first and second partial antennas disposed on a common substrate; and

a shared feed point adapted for matching in both of said operating bands, said antenna comprising at least one short-circuit point disposed proximate to a feed point to permit said matching.

42. The antenna of claim 41, wherein said antenna is adapted for said matching in either of said two bands without significantly degrading the matching in the other of said two bands.

43. The antenna of claim 41, wherein isolation between the first and second partial antennas is maintained despite said common substrate.