Hand-held transmitting and/or receiving apparatus

• US 5,952,975 A
• Filed: 08/19/1997
• Issued: 09/14/1999
• Est. Priority Date: 03/08/1994
• Status: Expired due to Term

• Current Assignee: Telit Communications PLC
• Original Assignee: Telital R&D Denmark A/S
• Inventors: Pedersen, Gert Fr.o slashed.lund, Thomsen, Jan Gert
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Phan, Tho
• Application Number:
  US08/915,308
• Time in Patent Office: 756 Days
• Field of Search: 343/846, 343/700 MS, 343/829, 343/702, 343/841, 343/843
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

A hand-held transmitting and/or receiving apparatus includes an elongated housing, an electric circuit inside the housing, an earphone positioned at one end of the front side of the housing, an electric ground plane positioned on the rear side of the housing at an end opposite the earphone, an antenna resonant element extending approximately parallel to the ground plane and having a first free end and a second end electrically connected by a ground connector to the ground plane, and a device connecting the ground plane and resonant element to the electric circuit. The free end of the resonant element points towards the end of the housing at which the earphone is positioned. In this arrange the strength of the electrical field of the antenna is lowest near hand or the head of the user. This reduces health risks and influences due to the hand or the body of the user on the electric field of the antenna.

Claims

1. A hand-held radio transceiver comprising:

a housing having a top end and a bottom end, and front and rear sides extending between the top and bottom ends;

an earphone disposed on the housing front side adjacent the top end thereof;

an antenna system extending along the housing rear side and having a ground plane disposed generally opposite the earphone, a resonant element extending along a resonator plane generally parallel to the ground plane, and a feeder element, the resonant element having a grounding end spaced away from the housing top end and a free edge extending from said grounding end toward the housing top end, and a ground connector extending between and electrically connecting the ground plane to the resonant element grounding end, the feeder element electrically connecting the resonant element to an electric circuit without mechanically contacting the resonant element;

said electric circuit being within the housing and electrically connected to the antenna system via an elastic, electrically conductive element positioned between said electric circuit and said feeder element forming an electrical connection therebetween;

the housing of said transceiver terminating short of a region opposite to said resonant element free edge along the direction of said resonant plane, whereby signals tend to radiate from the resonant element upwardly and away from the earphone.

2. The hand-held radio transceiver of claim 1, wherein said free edge of said resonant element is adjacent to said housing top end.

3. The hand-held radio transceiver of claim 1, wherein said antenna system further comprises a dielectric body, and said ground plane, resonant element and ground connector of said antenna system comprise electrically conductive layers on said dielectric body.

4. The hand-held radio transceiver of claim 1, wherein said housing rear side has a width and said ground plane has a width substantially equal to the width of said housing rear side.

5. The hand-held radio transceiver of claim 1, wherein said ground plane has a width and said resonant element has a width substantially equal to the width of said ground plane.

6. The hand-held radio transceiver of claim 1, wherein said resonant element has a width and said ground connector has a width substantially equal to at least one-half the width of said resonant element.

7. The hand-held radio transceiver of claim 1, further comprising a second ground connector, said first and second ground connectors being distributed over the width of said grounding end of said resonant element.

8. The hand-held radio transceiver of claim 1, further comprising an elastic, electrically conductive element positioned between said electric circuit and said ground plane and forming an electrical connection therebetween.

9. The hand-held radio transceiver of claim 1, wherein said resonant element of said antenna system further comprises a tuning stub projecting from said free edge, said tuning stub having a width smaller than a width of said free edge, and further comprising a feeder element electrically connecting the resonant element to the electric circuit.

10. The hand-held radio transceiver of claim 1, wherein said resonant element has an arcuate surface contour.

11. A hand-held radio transceiver comprising:

a housing having a top end and a bottom end, and front and rear sides extending between the top and bottom ends;

an earphone disposed on the housing front side adjacent the top end thereof;

an antenna system extending along the housing rear side and having a ground plane disposed generally opposite the earphone and a resonant element extending along a resonant plane generally parallel to the ground plane, the resonant element having a grounding end spaced away from the housing top end and a free edge extending from said grounding end toward the housing top end, and a ground connector extending between and electrically connecting the ground plane to the resonant element grounding end;

an electric circuit within the housing being electrically connected to the antenna system;

the housing of said transceiver being nonconductive and said antenna system being positioned inside of said housing, whereby signals tend to radiate from the resonant element upwardly and away from the earphone through the housing.

12. The hand-held radio transceiver of claim 11, wherein said free edge of said resonant element is adjacent to said housing top end.

13. The hand-held radio transceiver of claim 11, wherein said antenna system further comprises a dielectric body, and said ground plane, resonant element and ground connector of said antenna system comprise electrically conductive layers on said dielectric body.

14. The hand-held radio transceiver of claim 11, wherein-said housing rear side has a width and said ground plane has a width substantially equal to the width of said housing rear side.

15. The hand-held radio transceiver of claim 11, wherein said ground plane has a width and said resonant element has a width substantially equal to the width of said ground plane.

16. The hand-held radio transceiver of claim 11, wherein said resonant element has a width and said ground connector has a width substantially equal to at least one-half the width of said resonant element.

17. The hand-held radio transceiver of claim 11, further comprising a second ground connector, said first and second ground connectors being distributed over the width of said grounding end of said resonant element.

18. The hand-held radio transceiver of claim 11, further comprising an elastic, electrically conductive element positioned between said electric circuit and said ground plane and forming an electrical connection therebetween.

19. The hand-held radio transceiver of claim 11, wherein said antenna system further comprises a feeder element electrically connecting the resonant element to the electric circuit without mechanically contacting the resonant element.

20. The hand-held radio transceiver of claim 19, further comprising an elastic, electrically conductive element positioned between said electric circuit and said feeder element and forming an electrical connection therebetween.

21. The hand-held radio transceiver of claim 11, wherein said resonant element of said antenna system further comprises a tuning stub projecting from said free edge, said tuning stub having a width smaller than a width of said free edge, and further comprising a feeder element electrically connecting the resonant element to the electric circuit.

22. The hand-held radio transceiver of claim 11, wherein said resonant element has an arcuate surface contour.

23. A hand-held radio transceiver comprising:

a housing,

an electric circuit within the housing,

an antenna system extending along the housing and having

a ground plane,

a resonant element extending generally parallel to the ground plane, the resonant element having a free edge,

a ground connector extending between and electrically connecting the ground plane to the resonant element at a location distal from said free edge, and

a feeder element electrically connecting the resonant element to the electric circuit without mechanically contacting the resonant element, wherein said feeder element extends adjacent to and along said free edge of said resonant element.

24. The hand-held radio transceiver of claim 23 wherein said feeder element has a first end and a second end, said first end of said feeder element being mechanically and electrically connected to said electric circuit, and a width of said feeder element in the plane of said resonant element is substantially smaller than a width of said resonant element.

25. The hand-held radio transceiver of claim 24 wherein said feeder element includes an elongated element, said elongated element extending adjacent to and along said resonant element between said location of said ground connector and said free edge of said resonant element.

26. The hand-held radio transceiver of claim 25 wherein said feeder element includes a second elongated element, said second elongated element extending adjacent to and along said free edge of said resonant element.

27. The hand-held radio transceiver of claim 23, wherein said antenna system further comprises a dielectric body, and said ground plane, resonant element, ground connector and feeder element of said antenna system comprise electrically conductive layers on said dielectric body.

28. The hand-held radio transceiver of claim 23, wherein said housing is electrically non-conductive, and said antenna system is positioned inside of said housing.

29. The hand-held radio transceiver of claim 23, wherein said housing rear side has a width and said ground plane has a width substantially equal to the width of said housing rear side.

30. The hand-held radio transceiver of claim 23, wherein said ground plane has a width and said resonant element has a width substantially equal to the width of said ground plane.

31. The hand-held radio transceiver of claim 23, wherein said resonant element has a width and said ground connector has a width substantially equal to at least one-half the width of said resonant element.

32. The hand-held radio transceiver of claim 23, further comprising a second ground connector, said first and second ground connectors being distributed over the width of said grounding end of said resonant element.

33. The hand-held radio transceiver of claim 23, further comprising an elastic, electrically conductive element positioned between said electric circuit and said ground plane and forming an electrical connection therebetween.

34. The hand-held radio transceiver of claim 23, further comprising an elastic, electrically conductive element positioned between said electric circuit and said feeder element and forming an electrical connection therebetween.

35. The hand-held radio transceiver of claim 23, wherein said resonant element of said antenna system further comprises a tuning stub projecting from said free edge, said tuning stub having a width smaller than a width of said free edge.

36. The hand-held radio transceiver of claim 23, wherein said resonant element has an arcuate surface contour.

37. A hand-held radio transceiver comprising:

a housing,

an electric circuit within the housing,

an antenna system extending along the housing and having

a ground plane,

a resonant element extending generally parallel to the ground plane, the resonant element having a free edge and an arcuate surface contour, the arcuate contour curving away from said ground plane, and

a ground connector extending between and electrically connecting the ground plane to the resonant element at a location distal from said free edge.

38. The hand-held radio transceiver of claim 37, wherein said antenna system further comprises a dielectric body, and said ground plane, resonant element and ground connector of said antenna system comprise electrically conductive layers on said dielectric body.

39. The hand-held radio transceiver of claim 37, wherein said housing is electrically non-conductive, and said antenna system is positioned inside of said housing.

40. The hand-held radio transceiver of claim 37, wherein said housing rear side has a width and said ground plane has a width substantially equal to the width of said housing rear side.

41. The hand-held radio transceiver of claim 37, wherein said ground plane has a width and said resonant element has a width substantially equal to the width of said ground plane.

42. The hand-held radio transceiver of claim 37, wherein said resonant element has a width and said ground connector has a width substantially equal to at least one-half the width of said resonant element.

43. The hand-held radio transceiver of claim 37, further comprising a second ground connector, said first and second ground connectors being distributed over the width of said resonant element.

44. The hand-held radio transceiver of claim 37, further comprising an elastic, electrically conductive element positioned between said electric circuit and said ground plane and forming an electrical connection therebetween.