Dual band bowtie/meander antenna

• US 20010011964A1
• Filed: 01/19/2001
• Published: 08/09/2001
• Est. Priority Date: 08/18/1999
• Status: Active Grant

• Current Assignee: John M. Spall, Robert A. Sadler
• Original Assignee: John M. Spall, Robert A. Sadler
• Inventors: Sadler, Robert A., Spall, John M.
• Granted Patent: US 6,417,816 B2
• Time in Patent Office: Days
• US Class Current: 343/824
• 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 19/108 Combination of a dipole with a plane reflecting surface H01Q19/106 takes precedence; strip line H01Q9/065
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/26 with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength resonant loop antennas H01Q7/00
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

An internal dipole bowtie/meander antenna for a mobile terminal is capable of operating in two distinct RF bands. The antenna includes a resonating element and a ground element positioned on opposite sides of a dielectric material. The dielectric material is positioned generally perpendicular to a ground plane of the antenna. Tuning elements may be added to vary the coupling of the antenna elements to the ground plane.

Claims

1. A dipole antenna for a mobile communication device comprising:

a) a planar dielectric substrate having first and second opposing surfaces and oriented generally perpendicularly to a ground plane disposed within a housing of the mobile communication device;

b) a first radiating element on said first opposing surface of said dielectric substrate; and

c) a second radiating element on said second opposing surface of said dielectric substrate.

2. The dipole antenna of

claim 1

wherein said first and second radiating elements include a bowtie element disposed in a central portion of the dielectric substrate.

3. The dipole antenna of

claim 2

wherein said first and second radiating elements further include meander elements extending in opposite directions along a longitudinal axis of said dielectric substrate from said bowtie elements.

4. The dipole antenna of

claim 1

wherein each said radiating element includes a meander element extending along a longitudinal axis of said dielectric substrate from a center portion of the dielectric substrate towards an end of said dielectric substrate.

5. The dipole antenna according to

claim 4

wherein said meander elements include one or more oscillations that oscillate about said longitudinal axis.

6. The dipole antenna according to

claim 5

wherein said oscillations are generally rectangular in form.

7. The dipole antenna of

claim 4

wherein said meander elements are non-uniform.

8. The dipole antenna according to

claim 7

wherein the meander element includes a plurality of meander segments of varying width.

9. The dipole antenna according to

claim 8

wherein the meander elements include a first meander segment disposed below said longitudinal axis and a second meander segment disposed above said longitudinal axis, and wherein said first meander segment is wider than said second meander segment.

10. The dipole antenna according to

claim 7

wherein said meander elements include a plurality of oscillations, and wherein said oscillations vary in shape.

11. The dipole antenna according to

claim 7

wherein said meander elements include a plurality of oscillations, and wherein said oscillations are unevenly spaced along the length of said meander elements.

12. The mobile communications terminal of

claim 1

wherein the longitudinal axis of the radiating elements is parallel to said ground plane.

13. The dipole antenna according to

claim 1

wherein said radiating elements are asymmetrical.

14. The dipole antenna according to

claim 1

wherein said first and second radiating elements are of different electrical lengths.

15. The dipole antenna according to

claim 1

wherein said antenna resonates in at least two frequency bands.

16. The dipole antenna according to

claim 1

further including at least one parasitic tuning element disposed generally parallel to said dielectric substrate.

17. The dipole antenna according to

claim 16

wherein s aid parasitic tuning element comprises a planar conductive element in parallel spaced relation to said dielectric substrate.

18. The dipole antenna according to

claim 17

wherein said parasitic tuning element is spaced from said ground plane.

19. The dipole antenna according to

claim 17

wherein said parasitic tuning element is electrically connected to said ground plane.

20. A mobile communications terminal comprising:

a) a radio communications circuit;

b) a ground plane operatively coupled to said radio communications circuit; and

c) a dipole antenna having first and second radiating elements operatively coupled to said radio communications circuit for receipt and transmission of radio signals, said antenna oriented generally perpendicular to said ground plane.

21. The mobile communication device of

claim 20

wherein said first and second radiating elements include a bowtie element disposed in a central portion of the dielectric substrate.

22. The mobile communication device of

claim 21

wherein said first and second radiating elements further include meander elements extending in opposite directions along a longitudinal axis of said dielectric substrate from said bowtie elements.

23. The mobile communication device of

claim 20

wherein each said radiating element includes a meander element extending along a longitudinal axis of said dielectric substrate from a center portion of the dielectric substrate towards an end of said dielectric substrate.

24. The mobile communication device according to

claim 23

wherein said meander elements include one or more oscillations that oscillate about said longitudinal axis.

25. The mobile communication device according to

claim 24

wherein said oscillations are generally rectangular in form.

26. The mobile communication device of

claim 23

wherein said meander elements are non-uniform.

27. The mobile communication device according to

claim 26

wherein the meander element includes a plurality of meander segments of varying width.

28. The mobile communication device according to

claim 27

wherein the meander elements include a first meander segment disposed below said longitudinal axis and a second meander segment disposed above said longitudinal axis, and wherein said first meander segment is wider than said second meander segment.

29. The mobile communication device according to

claim 26

wherein said meander elements include a plurality of oscillations, and wherein said oscillations vary in shape.

30. The mobile communication device according to

claim 26

wherein said meander elements include a plurality of oscillations, and wherein said oscillations are unevenly spaced along the length of said meander elements.

31. The mobile communications terminal according to

claim 20

wherein the longitudinal axis of the radiating elements is parallel to said ground plane.

32. The mobile communication device according to

claim 20

wherein said radiating elements are asymmetrical.

33. The mobile communication device according to

claim 20

wherein said first and second radiating elements are of different electrical lengths.

34. The mobile communication device according to

claim 20

wherein said antenna resonates in at least two frequency bands.

35. The mobile communications device according to

claim 20

further including a parasitic tuning element.

36. The mobile communications device according to

claim 35

wherein said tuning element is at least one planar conductor positioned perpendicular to said ground plane.

37. The mobile communications device according to

claim 36

wherein said planar conductor is spaced from said ground plane.

38. The mobile communications device of

claim 36

wherein said planar conductor is electrically connected to said ground plane.

39. The mobile communications device of

claim 20

further including a circuit board containing said radio communications circuits.

40. The mobile communications device of

claim 39

wherein said ground plane is disposed perpendicular to said circuit board.

41. The mobile communications device of

claim 39

wherein said circuit board contains said ground plane.