Multiple frequency band antenna

• US 5,986,609 A
• Filed: 06/03/1998
• Issued: 11/16/1999
• Est. Priority Date: 06/03/1998
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Spall, John M.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): NGUYEN, HOANG V
• Application Number:
  US09/089,433
• Time in Patent Office: 531 Days
• Field of Search: 343/702, 343/700 MS, 343/792.5, 343/895, 343/795, 343/796
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• 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 5/357 using a single feed point
• 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

Antennas configured to be enclosed within a flip cover of a radiotelephone and to resonate in three frequency bands include a dielectric substrate having opposite first and second faces, and opposite first and second ends. A first radiating element is disposed on the first face adjacent the first end, and a second radiating element is disposed on the dielectric substrate second face adjacent the second end. Each radiating element tapers from a respective end of the substrate to a medial portion of a respective face. Each radiating element also includes a respective meandering electrically conductive path.

Claims

1. An antenna, comprising:

a dielectric substrate comprising opposite first and second faces, and opposite first and second ends;

a first radiating element disposed on said dielectric substrate first face adjacent said first end, said first radiating element comprising a first meandering electrically conductive path, said first radiating element tapering from said first end to a medial portion of said first face; and

a second radiating element disposed on said dielectric substrate second face adjacent said second end, said second radiating element comprising a second meandering electrically conductive path, said second radiating element tapering from said second end to a medial portion of said second face.

2. An antenna according to claim 1 wherein said first and second meandering electrically conductive paths have different electrical lengths.

3. An antenna according to claim 1 wherein said first and second radiating elements have different surface areas.

4. An antenna according to claim 1 further comprising an electrical trace that adds electrical length to said first radiating element.

5. An antenna according to claim 1 further comprising an electrical trace that adds electrical length to said second radiating element.

6. An antenna according to claim 1 further comprising an antenna feed including first and second conductors, said first conductor electrically connected to said first radiating element and said second conductor electrically connected to said second radiating element.

7. An antenna according to claim 6 further comprising an aperture formed through said dielectric substrate adjacent said first and second face medial portions, and wherein said antenna feed first conductor extends through said aperture.

8. An antenna according to claim 1 wherein said dielectric substrate has a dielectric constant between 4.4 and 4.8.

9. An antenna according to claim 1 wherein said first and second radiating elements jointly resonate within multiple frequency bands.

10. An antenna according to claim 1 wherein said first and second radiating elements jointly resonate within three frequency bands.

11. An antenna assembly for a communications device, said antenna assembly comprising:

a dielectric substrate comprising opposite first and second faces, and opposite first and second ends;

a first radiating element disposed on said dielectric substrate first face adjacent said first end, said first radiating element comprising a first meandering electrically conductive path, said first radiating element tapering from said first end to a medial portion of said first face;

a second radiating element disposed on said dielectric substrate second face adjacent said second end, said second radiating element comprising a second meandering electrically conductive path, said second radiating element tapering from said second end to a medial portion of said second face; and

an antenna feed including first and second conductors, said first conductor electrically connected to said first radiating element, and said second conductor electrically connected to said second radiating element.

12. An antenna assembly according to claim 11 wherein said first and second meandering electrically conductive paths have different electrical lengths.

13. An antenna assembly according to claim 11 wherein said first and second radiating elements have different surface areas.

14. An antenna assembly according to claim 11 further comprising an electrical trace that adds electrical length to said first radiating element.

15. An antenna assembly according to claim 11 further comprising an electrical trace that adds electrical length to said second radiating element.

16. An antenna assembly according to claim 11 further comprising an aperture formed through said dielectric substrate adjacent said first and second face medial portions, and wherein said antenna feed first conductor extends through said aperture.

17. An antenna assembly according to claim 11 wherein said dielectric substrate has a dielectric constant between 4.4 and 4.8.

18. An antenna assembly according to claim 11 wherein said first and second radiating elements jointly resonate within multiple frequency bands.

19. An antenna assembly according to claim 11 wherein said first and second radiating elements jointly resonate within three frequency bands.

20. A radiotelephone apparatus, comprising:

a housing configured to enclose electronic components that transmit and receive radiotelephone communications signals;

a flip cover hinged to said housing; and

an antenna assembly disposed within said flip cover, said antenna assembly comprising;

a dielectric substrate comprising opposite first and second faces, and opposite first and second ends;

a first radiating element disposed on said dielectric substrate first face adjacent said first end, said first radiating element comprising a first meandering electrically conductive path, said first radiating element tapering from said first end to a medial portion of said first face;

a second radiating element disposed on said dielectric substrate second face adjacent said second end, said second radiating element comprising a second meandering electrically conductive path, said second radiating element tapering from said second end to a medial portion of said second face; and

an antenna feed including first and second conductors, said first conductor electrically connected to said first radiating element, and said second conductor electrically connected to said second radiating element.

21. A radiotelephone according to claim 20 wherein said first and second meandering electrically conductive paths have different electrical lengths.

22. A radiotelephone according to claim 20 wherein said first and second radiating elements have different surface areas.

23. A radiotelephone according to claim 20 further comprising an electrical trace that adds electrical length to said first radiating element.

24. A radiotelephone according to claim 20 further comprising an electrical trace that adds electrical length to said second radiating element.

25. A radiotelephone according to claim 20 further comprising an aperture formed through said dielectric substrate adjacent said first and second face medial portions, and wherein said antenna feed first conductor extends through said aperture.

26. A radiotelephone according to claim 20 wherein said dielectric substrate has a dielectric constant between 4.4 and 4.8.

27. A radiotelephone according to claim 20 wherein said first and second radiating elements jointly resonate within multiple frequency bands.

28. A radiotelephone according to claim 20 wherein said first and second radiating elements jointly resonate within three frequency bands.

29. A radiotelephone apparatus, comprising:

a housing configured to enclose electronic components that transmit and receive radiotelephone communications signals;

a flip cover hinged to said housing; and

an antenna assembly disposed within said flip cover, said antenna assembly comprising;

a dielectric substrate; and

a radiating element disposed on a face of said dielectric substrate adjacent an end thereof, said radiating element comprising a meandering electrically conductive path, said radiating element tapering from said end to a medial portion of said face.

30. A radiotelephone according to claim 29 further comprising an aperture formed through said dielectric substrate at said medial portion.

31. A radiotelephone according to claim 30 further comprising a conductor of an antenna feed extending through said aperture and electrically connected to said radiating element.

32. A radiotelephone according to claim 29 wherein said radiating element resonates within multiple frequency bands.

33. An electronic device, comprising:

a housing;

a flip cover hinged to said housing; and

an antenna disposed within said flip cover, comprising;

a dielectric substrate comprising opposite first and second faces, and opposite first and second ends;

a first radiating element disposed on said dielectric substrate first face adjacent said first end, said first radiating element comprising a first meandering electrically conductive path, said first radiating element tapering from said first end to a medial portion of said first face; and

a second radiating element disposed on said dielectric substrate second face adjacent said second end, said second radiating element comprising a second meandering electrically conductive path, said second radiating element tapering from said second end to a medial portion of said second face.

34. An electronic device according to claim 33 wherein said first and second meandering electrically conductive paths have different electrical lengths.

35. An electronic device according to claim 33 wherein said first and second radiating elements have different surface areas.