Antenna electrical coupling configurations

• US 6,249,688 B1
• Filed: 12/21/1998
• Issued: 06/19/2001
• Est. Priority Date: 12/21/1998
• Status: Expired due to Term

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hayes, Gerard J., Holshouser, Howard E.
• Primary Examiner(s): Trost, William G.
• Assistant Examiner(s): Tran, Congvan
• Application Number:
  US09/217,049
• Time in Patent Office: 911 Days
• Field of Search: 955/90, 955/562, 955/6.1, 955/13.3, 955/19, 343/700.R, 343/702, 343/725, 343/895, 343/896, 343/714, 343/715, 343/720, 343/723, 343/729
• US Class Current: 455/575.7
• CPC Class Codes: H01Q 1/084 Pivotable antennas
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 1/244 extendable from a housing along a given path
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence

Abstract

An indirect electrical coupling for a cellular telephone antenna is created by a rotary primary antenna and a stationary paging antenna when the primary antenna is extended into an operative position. When extended, the primary antenna is positioned proximate to the secondary antenna to define an electrical coupling therebetween. Rotating the primary antenna away from the extended position automatically disengages the primary antenna from the telephone operating circuit. The antenna elements or antenna spacings provide the appropriate matching circuitry and the advancement and retraction of the primary antenna provides the switching of the matching circuitry.

Claims

1. An indirect antenna coupling assembly, comprising:

a first antenna member having a first radiating element thereon, said first antenna member configured to pivotably rotate about an axis of rotation from a stow position to an extended position; and

a second antenna member having a second radiating element thereon,

wherein when said first antenna member is in said extended position, said first radiating element and said second radiating element are spatially separated with a gap therebetween, said gap defining an indirect electrical coupling between said first radiating element and said second radiating element, and wherein when said first antenna member is in said stow position, said first radiating element and said second radiating element are sufficiently spatially separated to electrically decouple said first and second radiating elements.

2. An indirect antenna coupling according to claim 1, wherein said first antenna member comprises an inductive element and is configured to be operatively associated with an electrical ground element.

3. An indirect antenna coupling according to claim 1, wherein said first radiating element is configured to define a ½

wave resonator, and wherein said first radiating element is arranged on said first antenna member as at least one of a rod, meander, helix, compressed helix, top loaded helix, and branch double resonance pattern.

4. An indirect antenna coupling assembly according to claim 3, wherein when said first antenna member is spatially separated from said second antenna member in said extended position, said first and second radiating elements together define about a ½

wave-radiating resonator.

5. An indirect antenna coupling according to claim 3, wherein said second antenna member is a paging antenna, and wherein said second antenna member is positioned behind said first antenna member when said first antenna member is in said extended position.

6. An indirect antenna coupling assembly according to claim 1, wherein said second radiating element defines a ¼

wave resonator, and wherein said second radiating element is arranged on said second antenna member as at least one of a rod, helix, compressed helix, branch double resonance and a meander pattern.

7. An indirect antenna coupling according to claim 1, wherein said first antenna member is rotatably extendable about an axis of rotation, and wherein said first antenna member rotates through about at least 180 degrees from said stow position to said extended position to advance into a preferred operative position and to indirectly electrically engage with said second antenna member.

8. An indirect antenna coupling according to claim 1, wherein said first antenna member and said second antenna member are spatially separated with a gap therebetween when said first antenna is in said extended position.

9. An indirect antenna coupling according to claim 1, further comprising a telephone body having opposing first and second ends, wherein said second antenna extends at least 20 millimeters above said first end of said telephone body, wherein said second antenna is a paging antenna operative when said first and second antennas are electrically decoupled, and wherein said first and second antenna bodies physically contact while said respective antenna radiating elements are spatially separated in the extended position.

10. An indirect antenna coupling according to claim 9, wherein said second antenna extends in a longitudinal direction that is angularly oriented away from a user when said telephone body is held in an operational position adjacent the head of the user.

11. An indirect antenna coupling according to claim 1, wherein said gap between said radiating elements is about 2-3 millimeters.

12. An indirect antenna coupling according to claim 1, wherein said gap between said radiating elements is configured to provide about a 6-8-picofarad capacitance value.

13. An indirect antenna coupling according to claim 1, wherein said gap between said radiating elements is provided as an air gap.

20. A radiotelephone according to claim 9, wherein said second antenna extends at least 20 millimeters above said radiotelephone body top end portion.

14. An indirect antenna coupling assembly comprising:

a first antenna member having a first radiating clement thereon, said first antenna member configured to pivotably rotate about an axis of rotation from a stow position to an extended position; and

a second antenna member having a second radiating element thereon,

wherein when said first antenna member is in said extended position, said first radiating element and said second radiating element are spatially separated with a gap therebetween, said gap defining an indirect electrical coupling between said first radiating element and said second radiating element, and wherein when said first antenna member is in said stow position, said first radiating element and said second radiating element are sufficiently spatially separated to electrically decouple said first and second radiating elements,

wherein said first antenna member is rotatable extendable about an axis of rotation, and wherein said first antenna member rotates through about at least 180 degrees from said stow position to said extended position to advance into a preferred operative position and to indirectly electrically engage with said second antenna member, and

wherein said first antenna member is configured as a flexible conductive trace antenna, and wherein said first antenna member rotates to contact said second antenna member in said extended position.

15. A radiotelephone, comprising:

a radiotelephone body having a top end portion and a top surface and comprising an electrical operating circuit therein;

a first antenna pivotably attached to said radiotelephone body such that said first antenna has a first stow position and a second extended position, wherein said first antenna rotates about an axis of rotation to longitudinally extend away from said radiotelephone body top end portion in said second extended position; and

a second antenna attached to said radiotelephone body and configured to electrically connect to said electrical operating circuit in said radiotelephone body;

wherein when said first antenna is in said second extended position, said first antenna and said second antenna are spatially separated with a gap therebetween, said gap defining an indirect electrical coupling between said first antenna and said second antenna, and wherein when said first antenna is in said first stow position, said first antenna and said second antenna are sufficiently spatially separated to electrically decouple said first and second antennae.

16. A radiotelephone according to claim 15, wherein said first antenna is electrically decoupled from said second antenna and said operating circuit when in said first stow position.

17. A radiotelephone according to claim 15, further comprising an electrical ground element operatively associated with said radiotelephone, wherein said first antenna comprises an inductive element and is electrically connected to said electrical ground element.

18. A radiotelephone according to claim 17, wherein said indirect electrical coupling is an indirect capacitive coupling, and wherein when said first antenna is extended, said second antenna and said first antenna are spatially separated to define a capacitive coupling therebetween, and wherein when said first antenna is extended, said first and second antennae define an L-C series matching circuit operatively associated with said radiotelephone electrical operating circuit in said radiotelephone body.

19. A radiotelephone according to claim 15, wherein when said first antenna is in said first stow position, said second antenna defines a ¼

wave radiating element operatively associated with said operating circuit, and when said first antenna is extended, said first antenna and said second antenna electrically engage to define a ½

wave radiating element operatively associated with said operating circuit, and wherein said second antenna is a paging antenna operative when said first and second antennas are electrically decoupled.

21. A radiotelephone according to claim 15, wherein said second antenna extends in a longitudinal direction that is angularly oriented away from a user when said radiotelephone is held in an operational position adjacent the head of the user.

22. A radiotelephone according to claim 15, wherein said gap between said antennae is about 2-3 millimeters.

23. A radiotelephone according to claim 15, wherein said gap between said antennae is configured to provide about a 6-8 picofarad capacitance value.

24. A radiotelephone according to claim 15, wherein said gap between said antennae is provided as an air gap.

25. A cellular telephone, comprising:

a telephone body having opposing first and second ends and a top surface;

a flat blade paging antenna having a paging radiating element thereon attached to said telephone body and configured to extend a predetermined distance away from the first end of said telephone body;

an operating circuit disposed in said telephone body electrically connected to said paging antenna; and

a primary blade antenna having a primary radiating element thereon, said primary blade antenna configured to pivotably attach to said telephone body such that said primary antenna has a first stow position overlying a portion of said top surface of said telephone body and a second extended position such that said primary antenna longitudinally extends away from said first end of said telephone body,

wherein when said primary antenna is in said second extended position, said primary radiating element and said paging radiating element are spatially separated with a gap therebetween, said gap defining an indirect electrical coupling between said primary radiating element and said paging radiating element such that said primary radiating element and said paging radiating element provide a half-wave radiating resonator to said operating circuit, and wherein when said primary antenna is in said first stow position, said primary radiating element and said paging radiating element are sufficiently spatially separated to disengage said indirect electrical coupling between said primary radiating element and said paging radiating element, such that said paging radiating element presents a quarter-wave radiating resonator to said operating circuit.

26. A cellular telephone according to claim 25, wherein said paging antenna is fixed to a rear surface of said telephone body, and wherein, when in said second extended position, said primary antenna is positioned such that it is separate from and overlays at least a portion of said paging antenna to define a separation gap therebetween.

27. A cellular telephone according to claim 26, wherein said primary antenna rotates through an angle of greater than about 180 degrees from said first stow position to said second extended position.

28. A cellular telephone according to claim 25, further comprising an electrical ground element operatively associated with said telephone, wherein said primary antenna comprises an inductive element and is electrically connected to said electrical ground element.

29. A cellular telephone according to claim 28, wherein said electrical coupling is an indirect capacitive coupling, and wherein, when in said second extended position, said primary antenna inductor element is connected in series with said indirect capacitive coupling, thereby defining a series L-C matching circuit.

30. A cellular telephone according to claim 25, wherein said paging antenna extends at least 20 millimeters above said first end of said telephone body.

31. A cellular telephone according to claim 25, wherein said primary antenna rotates through about 180-210 degrees as it travels into said extended position, and wherein said primary antenna longitudinally extends in a direction that is angularly oriented away from a user when said cellular telephone is held in an operational position adjacent the head of the user.

32. A cellular telephone according to claim 25, wherein said paging antenna extends in a longitudinal direction that is angularly oriented away from a user when said cellular telephone is held in an operational position adjacent the head of the user.

33. A cellular telephone according to claim 25, wherein said gap between said radiating elements is about 2-3 millimeters.

34. A cellular telephone according to claim 25, wherein said gap between said radiating elements is configured to provide about a 6-8 picofarad capacitance value.

35. A cellular telephone according to claim 25, wherein said gap between said radiating elements is provided as an air gap.

36. A cellular telephone according to claim 25, wherein when said antennae separate by more than about 8-10 millimeters, said radiating elements are sufficiently spatially separated to disengage said indirect electrical coupling.

37. An indirect antenna coupling assembly comprising:

a first antenna member having a first radiating element thereon, said first antenna member configured to pivotably rotate about an axis of rotation from a stow position to an extended position; and

a second antenna member having a second radiating element thereon,

wherein when said first antenna member is in said extended position, said first radiating element and said second radiating element are spatially separated with a gap therebetween, said gap defining an indirect electrical coupling between said first radiating element and said second radiating element, and wherein when said first antenna member is in said stow position, said first radiating element and said second radiating element are sufficiently spatially separated to electrically decouple said first and second radiating elements,

wherein said first antenna rotates through about 180-210 degrees as it travels into said extended position, and wherein said first antenna longitudinally extends in a direction that is angularly oriented away from a user when said telephone body is held in an operational position adjacent the head of the user.

38. A radiotelephone comprising:

a radiotelephone body having a top end portion and a top surface and comprising an electrical operating circuit therein;

a first antenna pivotably attached to said radiotelephone body such that said first antenna has a first stow position and a second extended position, wherein said first antenna rotates about an axis of rotation to longitudinally extend away from said radiotelephone body top end portion in said second extended position; and

a second antenna attached to said radiotelephone body and configured to electrically connect to said electrical operating circuit in said radiotelephone body,

wherein when said first antenna is in said second extended position, said first antenna and said second antenna are spatially separated with a gap therebetween, said gap defining an indirect electrical coupling between said first antenna and said second antenna, and wherein when said first antenna is in said first stow position, said first antenna and said second antenna are sufficiently spatially separated to electrically decouple said first and second antennae,

wherein said first antenna rotates through about 180-210 degrees as it travels into said extended position, and wherein said first antenna longitudinally extends in a direction that is angularly oriented away from a user when said radiotelephone is held in an operational position adjacent the head of the user.