Antenna with nonradiative dielectric waveguide

• US 6,008,771 A
• Filed: 09/08/1997
• Issued: 12/28/1999
• Est. Priority Date: 01/09/1995
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Tanaka, Nobuaki, Arai, Seiichi, Kawahata, Kazunari, Ishikawa, Youhei
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): PHAN, THO GIA
• Application Number:
  US08/944,048
• Time in Patent Office: 841 Days
• Field of Search: 343/700 MS, 343/767, 343/771, 343/785, 343/909, 343/911 R, 343/846, 333/219.1, 333/237, 333/239, 333/248, 333/219.2
• US Class Current: 343/767
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 13/24 constituted by a dielectric or ferromagnetic rod or pipe H01Q13/28 takes precedence
• CPC Class Codes: H01Q 13/28 comprising elements constituting electric discontinuities and spaced in direction of wave propagation, e.g. dielectric elements or conductive elements forming artificial dielectric
• CPC Class Codes: H01Q 19/062 for focusing
• CPC Class Codes: H01Q 9/0485 Dielectric resonator antennas

Abstract

An antenna includes a cylindrically shaped dielectric resonator placed on a longitudinally extended axis of an elongated dielectric strip disposed on a planar conductor and another planar conductor having an opening covers the dielectric strip with the opening on the dielectric resonator. There may be another dielectric strip placed perpendicularly to the first dielectric strip such that the dielectric resonator is where the lines longitudinally extended from the axes of both dielectric strips will cross.

Claims

1. An antenna comprising:

a first planar conductor;

second planar conductor;

a longitudinally elongated dielectric strip disposed between said first planar conductor and said second planar conductor and extending to a front end;

a dielectric resonator disposed between said first planar conductor and said second planar conductor and in front of said front end on a longitudinally extended axis of said dielectric strip and without overlapping longitudinally with said dielectric strip;

said second planar conductor having at least one opening for radiating electromagnetic waves perpendicularly to said second planar conductor therethrough.

2. The antenna of claim 1 wherein said opening in said second planar conductor is rectangular in planar shape.

3. The antenna of claim 1 wherein said opening in said second planar conductor is cross-shaped.

4. The antenna of claim 1 wherein said opening in said second planar conductor is cross-sectionally trapezoidal.

5. The antenna of claim 1 further comprising a dielectric rod connected to said dielectric resonator and disposed through said opening in said second planar conductor.

6. The antenna of claim 5 wherein said dielectric resonator and said dielectric rod are unitarily formed.

7. The antenna of claim 1 further comprising another dielectric resonator disposed between said dielectric strip and said dielectric resonator.

8. The antenna of claim 1 further comprising a dielectric lens disposed over said opening in said second planar conductor.

9. The antenna of claim 1 wherein said dielectric strip serves as a nonradiative dielectric waveguide and is capable of allowing electromagnetic waves to propagate therealong in an LSM mode.

10. The antenna of claim 1 wherein said dielectric strip has an open end having a planar surface which is separated from said dielectric resonator.

11. The antenna of claim 1 wherein said dielectric strip and said dielectric resonator are electromagnetically coupled.

12. The antenna of claim 1 wherein electromagnetic waves transmitted to said dielectric strip generate an electric field with a component perpendicular to said longitudinally elongated dielectric strip and parallel to said first planar conductor and said second planar conductor and a magnetic field with a component perpendicular to said first planar conductor and said second planar conductor.

13. An antenna comprising:

a first planar conductor;

two longitudinally elongated dielectric strips mutually perpendicularly disposed on said first planar conductor;

a dielectric resonator disposed at a point where longitudinally extended axes of said dielectric strips cross each other; and

a second planar conductor covering upper surfaces of said dielectric strips and having an opening above said dielectric resonator.

14. The antenna of claim 13 wherein said opening in said second planar conductor is rectangular in planar shape.

15. The antenna of claim 13 wherein said opening in said second planar conductor is cross-shaped.

16. The antenna of claim 13 wherein said opening in said second planar conductor is cross-sectionally trapezoidal.

17. The antenna of claim 13 further comprising a dielectric rod connected to said dielectric resonator and disposed through said opening in said second planar conductor.

18. The antenna of claim 17 wherein said dielectric resonator and said dielectric rod are unitarily formed.

19. The antenna of claim 13 further comprising another dielectric resonator disposed between said dielectric strip and said dielectric resonator.

20. The antenna of claim 13 further comprising a dielectric lens disposed over said opening in said second planar conductor.

21. An antenna comprising:

a first planar conductor;

two longitudinally elongated dielectric strips mutually perpendicularly disposed on said first planar conductor;

a dielectric resonator disposed at a point where longitudinally extended axes of said dielectric strips cross each other; and

a second planar conductor covering upper surfaces of said dielectric strips and having an opening above said dielectric resonator.

22. The antenna of claim 21 wherein said opening in said second planar conductor is rectangular in planar shape.

23. The antenna of claim 21 wherein said opening in said second planar conductor is cross-shaped.

24. The antenna of claim 21 wherein said opening in said second planar conductor is cross-sectionally trapezoidal.

25. The antenna of claim 21 further comprising a dielectric rod connected to said dielectric resonator and disposed through said opening in said second planar conductor.

26. The antenna of claim 25 wherein said dielectric resonator and said dielectric rod are unitarily formed.

27. The antenna of claim 21 further comprising another dielectric resonator disposed between said dielectric strips and said dielectric resonator.

28. The antenna of claim 21 further comprising a dielectric lens disposed over said opening in said second planar conductor.

29. An antenna comprising:

a first planar conductor;

a longitudinally elongated dielectric strip disposed on said first planar conductor;

a dielectric resonator disposed on a longitudinally extended axis of said dielectric strip and longitudinally separated from said dielectric strip; and

a second planar conductor covering upper surface of said dielectric strip and having a single opening above said dielectric resonator.

30. The antenna of claim 29 wherein said opening in said second planar conductor is rectangular in planar shape.

31. The antenna of claim 29 wherein said opening in said second planar conductor is cross-shaped.

32. The antenna of claim 29 wherein said opening in said second planar conductor is cross-sectionally trapezoidal.

33. The antenna of claim 29 further comprising a dielectric rod connected to said dielectric resonator and disposed through said opening in said second planar conductor.

34. The antenna of claim 33 wherein said dielectric resonator and said dielectric rod are unitarily formed.

35. The antenna of claim 29 further comprising another dielectric resonator disposed between said dielectric strip and said dielectric resonator.

36. The antenna of claim 29 further comprising a dielectric lens disposed over said opening in said second planar conductor.

37. The antenna of claim 29 wherein said dielectric strip is capable of allowing electromagnetic waves to propagate therealong in an LSM mode.

38. The antenna of claim 29 wherein said dielectric strip has an open end having a planar surface which is separated from said dielectric resonator.

39. The antenna of claim 29 wherein said dielectric strip is sandwiched between said first planar conductor and said second planar conductor in a face-to-face contacting relationship therewith.