Terminal and associated transducer assembly and method for selectively transducing in at least two frequency bands

• US 7,469,131 B2
• Filed: 09/14/2004
• Issued: 12/23/2008
• Est. Priority Date: 09/14/2004
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Nail, David, Hutcheson, George
• Primary Examiner(s): Urban; Edward
• Assistant Examiner(s): Chen; Junpeng
• Application Number:
  US10/940,843
• Publication Number:
  US 20060057987A1
• Time in Patent Office: 1,561 Days
• Field of Search: 455/180.1, 455/188.1, 455/190.1, 455/193.2, 455/338, 455/552.1, 455/553.1, 455/168, 333/126, 333/103, 333/129, 333132-135, 343/700.MS, 343/702, 343/895, 343/858, 343/790, 343/767
• US Class Current: 455/168.1
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H

Abstract

A terminal is provided for selectively communicating in at least two frequency bands. The terminal includes an antenna transducer including a first port and a second port, where the antenna transducer is capable of selectively transducing first radio signals (e.g., low power radio frequency (LPRF) signals) to and/or from the first port, and/or second radio signals (e.g., global positioning system (GPS) signals) to and/or from the second port. In this regard, the antenna transducer is capable of transducing first radio signals such that an impedance at the second port approaches a short circuit or an open circuit, and capable of transducing second radio signals such that an impedance at the first port approaches an open circuit. An associated communication assembly and method for selectively communicating in at least two frequency bands are also provided.

Claims

1. An apparatus comprising:

an antenna transducer including a first port and a second port that is physically separated from the first port, wherein the antenna transducer further includes a transducer portion having an open end, a first feed line contact projecting from the transducer portion and engaging the first port, and a second feed line contact projecting from the transducer portion and engaging the second port, the first and second feed line contacts being positioned along the transducer portion at respective lengths from the open end of the transducer portion,

wherein the sum of the length of the transducer portion from the open end to the first feed line contact, and the length of the first feed line contact, is equal to approximately one-quarter wavelength of the first radio signals within the first frequency band, wherein the sum of the length of the transducer portion from the open end to the second feed line contact, and the length of the second feed line contact, is equal to approximately one-quarter wavelength of the second radio signals within the second frequency band,

wherein the antenna transducer is configured to selectively transduce at least one of first radio signals at least one of to or from the first port within a first frequency band, or second radio signals at least one of to or from the second port within a second frequency band, and wherein the antenna transducer is configured such that an impedance at the second port approaches one of a short circuit or an open circuit when the antenna transducer transduces the first radio signals, and such that an impedance at the first port approaches an open circuit when the antenna transducer transduces the second radio signals.

2. The apparatus of claim 1 further comprising:

a first communication assembly coupled to the antenna transducer at the first port of the antenna transducer, wherein the first communication assembly is configured to operatively communicate the first radio signals within a first frequency band via the antenna transducer, and

wherein the antenna transducer is configured such that the first communication assembly has an impedance at the first port approaching an open circuit when the antenna transducer transduces the second radio signals.

3. The apparatus of claim 2, wherein the first communication assembly comprises a first communication circuitry, a first filter and a first transformation element, wherein the first filter is coupled between the first communication circuitry and the first transformation element, and the first transformation element is coupled to the first port of the antenna transducer, and

wherein the antenna transducer is configured to such that the first transformation element transforms an impedance of the first filter at the first transformation element to the open circuit impedance of the first communication assembly at the first port when the antenna transducer transduces the second radio signals.

4. The apparatus of claim 3, wherein the first transformation element comprises a first transmission line configured to transform the impedance of the first filter to the open circuit impedance of the first communication assembly at the first port.

5. The apparatus of claim 3, wherein the antenna transducer is configured such that the first filter has an impedance at the first transformation element approaching a short circuit, and such that the first transformation element transforms the short circuit impedance of the first filter to the open circuit impedance of the first communication assembly at the first port, when the antenna transducer transduces the second radio signals.

6. The apparatus of claim 3, wherein the antenna transducer is configured such that the first filter has an impedance at the first transformation element approaching an open circuit, and such that the first transformation element maintains the open circuit impedance of the first filter at approximately the same open circuit impedance of the first communication assembly at the first port, when the antenna transducer transduces the second radio signals.

7. The apparatus of claim 2 further comprising:

a second communication assembly coupled to the antenna transducer at the second port of the antenna transducer, wherein the second communication assembly is configured to operatively communicate the second radio signals within a second frequency band via the antenna transducer, and

wherein the antenna transducer is configured such that the second communication assembly has an impedance at the second port approaching one of a short circuit or an open circuit when the antenna transducer transduces the first radio signals.

8. The apparatus of claim 7, wherein the second communication assembly comprises a second communication circuitry, a second filter and a second transformation element, wherein the second filter is coupled between the second communication circuitry and the second transformation element, and the second transformation element is coupled to the second port of the antenna transducer, and

wherein the antenna transducer is configured such that the second transformation element transforms an impedance of the second filter at the second transformation element to the one of the short circuit or open circuit impedance of the second communication assembly at the second port when the antenna transducer transduces the first radio signals.

9. The apparatus of claim 8, wherein the second transformation element comprises a second transmission line configured to transform the impedance of the second filter to the one of the short circuit or open circuit impedance of the second communication assembly at the second port.

10. The apparatus of claim 8, wherein the antenna transducer is configured such that the second filter has an impedance at the second transformation element approaching one of a short circuit or an open circuit, and such that the second transformation element transforms the one of the short circuit or open circuit impedance of the second filter to the other one of the short circuit or open circuit impedance of the second communication assembly at the second port, when the antenna transducer transduces the first radio signals.

11. The apparatus of claim 8, wherein the antenna transducer is configured such that the second filter has an impedance at the second transformation element approaching one of a short circuit or an open circuit, and such that the second transformation element transforms the one of the short circuit or open circuit impedance of the second filter to the same one of the short circuit or open circuit impedance of the second communication assembly at the second port, when the antenna transducer transduces the first radio signals.

12. The apparatus of claim 7, wherein the first communication assembly is configured to operatively communicate low power radio frequency (LPRF) radio signals within the first frequency band via the antenna transducer, and wherein the second communication assembly is configured to operatively communicate global positioning system (GPS) radio signals within the second frequency band via the antenna transducer.

13. The apparatus of claim 1, wherein the antenna transducer comprises:

a primary transducer portion configured to effectuate communication in accordance with a cellular communication technique; and

a second transducer portion including the transducer portion, first and second feed line contacts, and first port and the second port.

14. The apparatus of claim 13, wherein the antenna transducer comprises an inverted F-antenna (IFA) transducer.

15. The apparatus of claim 1, wherein the first and second ports comprise galvanic couplings of the antenna transducer to the same surface of the substrate.

16. An apparatus comprising:

an antenna transducer comprising a first port and a second port that is physically separated from the first port, wherein the antenna transducer further includes a transducer portion having an open end, a first feed line contact projecting from the transducer portion and engaging the first port, and a second feed line contact projecting from the transducer portion and engaging the second port, the first and second feed line contacts being positioned along the transducer portion at respective lengths from the open end of the transducer portion, wherein the sum of the length of the transducer portion from the open end to the first feed line contact, and the length of the first feed line contact, is equal to approximately one-quarter wavelength of the first radio signals within the first frequency band, wherein the sum of the length of the transducer portion from the open end to the second feed line contact, and the length of the second feed line contact, is equal to approximately one-quarter wavelength of the second radio signals within the second frequency band, and wherein the antenna transducer is configured to selectively transduce at least one of first radio signals at least one of to or from the first port within a first frequency band, or second radio signals at least one of to or from the second port within a second frequency band;

a communication module configured to operatively communicate radio signals within a frequency band via the antenna transducer; and

a transformation element coupled to the communication module and the first port of the antenna transducer, and

wherein at least one of the communication module or transformation element are configured such that, when the antenna transducer transduces the second radio signals, an impedance at the first port approaches one of a short circuit or an open circuit.

17. The apparatus of claim 16, wherein the communication module comprises a communication circuitry and a filter, wherein the filter is coupled between the communication circuitry and the transformation element, and the transformation element is coupled to the first port of the antenna transducer, and

wherein at least one of the filter or the transformation element are configured such that, when the antenna transducer transduces the second radio signals, the transformation element transforms an impedance of the filter at the transformation element to the one of the short circuit or open circuit impedance at the first port.

18. The apparatus of claim 17, wherein the transformation element comprises a transmission line configured to transform the impedance of the filter to the one of the short circuit or open circuit impedance at the first port.

19. The apparatus of claim 17, wherein at least one of the filter or the transformation element are configured such that, when the antenna transducer transduces the second radio signals, the filter has an impedance at the transformation element approaching one of an short circuit or an open circuit, and such that the transformation element transforms the one of the open circuit or short circuit impedance of the filter to the other one of the short circuit or open circuit impedance at the first port.

20. The apparatus of claim 17, wherein at least one of the filter or the transformation element are configured such that, when the antenna transducer transduces the second radio signals, the filter has an impedance at the transformation element approaching one of an short circuit or an open circuit, and such that the transformation element transforms the one of the open circuit or short circuit impedance of the filter to the same one of the short circuit or open circuit impedance at the first port.

21. The apparatus of claim 16, wherein the communication module is configured to operatively communicate low power radio frequency (LPRF) radio signals via the antenna transducer, and wherein the transformation element is coupled to an antenna transducer configured to selectively transduce at least one of LPRF radio signals at least one of to or from the first port, or global positioning system (UPS) radio signals at least one of to or from the second port.

22. The apparatus of claim 16, wherein the communication module is configured to operatively communicate global positioning system (UPS) radio signals via the antenna transducer, and wherein the transformation element is coupled to an antenna transducer configured to selectively transduce at least one of GPS radio signals at least one of to or from the first port, or low power radio frequency (LPRF) radio signals at least one of to or from the second port.

23. The apparatus of claim 16, wherein the transformation element is coupled to an antenna transducer including a primary transducer portion configured to effectuate communication in accordance with a cellular communication technique, and a second transducer portion including the transducer portion, first and second feed line contacts, and first port and the second port.

24. The apparatus of claim 16, wherein the first and second ports comprise galvanic couplings of the antenna transducer to the same surface of the substrate.

25. A method comprising:

providing an apparatus comprising;

an antenna transducer including a first port and a second port that is physically separated from the first port, the antenna transducer further including a transducer portion having an open end, a first feed line contact projecting from the transducer portion and engaging the first port, and a second feed line contact projecting from the transducer portion and engaging the second port, the first and second feed line contacts being positioned along the transducer portion at respective lengths from the open end of the transducer portion, wherein the sum of the length of the transducer portion from the open end to the first feed line contact, and the length of the first feed line contact, is equal to approximately one-quarter wavelength of the first radio signals within the first frequency band, and wherein the sum of the length of the transducer portion from the open end to the second feed line contact, and the length of the second feed line contact, is equal to approximately one-quarter wavelength of the second radio signals within the second frequency band; and

selectively transducing at least one of first radio signals at least one of to or from the first port within a first frequency band, or second radio signals at least one of to or from the second port within a second frequency band, an impedance at the second port approaching one of a short circuit or an open circuit when the first radio signals are transduced, and an impedance at the first port approaching an open circuit when the second radio signals are transduced.

26. The method of claim 25 further comprising:

providing a first communication assembly coupled to the antenna transducer at the first port of the antenna transducer, wherein the first communication assembly is configured to operatively communicate the first radio signals within a first frequency band via the antenna transducer, and

wherein the first communication assembly has an impedance at the first port approaching an open circuit when the second radio signals are transduced.

27. The method of claim 26, wherein providing the first communication assembly comprises providing a first communication assembly including a first communication circuitry, a first filter and a first transformation element, wherein the first filter is coupled between the first communication circuitry and the first transformation element, and the first transformation element is coupled to the first port of the antenna transducer, and

wherein the first transformation element transforms an impedance of the first filter at the first transformation element to the open circuit impedance of the first communication assembly at the first port when the second radio signals are transduced.

28. The method of claim 27, wherein the first filter has an impedance at the first transformation element approaching a short circuit, and the first transformation element transforms the short circuit impedance of the first filter to the open circuit impedance of the first communication assembly at the first port, when the second radio signals are transduced.

29. The method of claim 27, wherein the first filter has an impedance at the first transformation element approaching an open circuit, and the first transformation element maintains the open circuit impedance of the first filter at approximately the same open circuit impedance of the first communication assembly at the first port, when the second radio signals are transduced.

30. The method of claim 26 further comprising:

providing a second communication assembly coupled to the antenna transducer at the second port of the antenna transducer, wherein the second communication assembly is configured to operatively communicate the second radio signals within a second frequency band via the antenna transducer, and

wherein the second communication assembly has an impedance at the second port approaching one of a short circuit or an open circuit when the first radio signals are transduced.

31. The method of claim 30 wherein providing the second communication assembly comprises providing a second communication assembly including a second communication circuitry, a second filter and a second transformation element, wherein the second filter is coupled between the second communication circuitry and the second transformation element, and the second transformation element is coupled to the second port of the antenna transducer, and

wherein the second transformation element transforms an impedance of the second filter at the second transformation element to the one of the short circuit or open circuit impedance of the second communication assembly at the second port when the first radio signals are transduced.

32. The method of claim 31 wherein the second filter has an impedance at the second transformation element approaching one of a short circuit or an open circuit, and the first transformation element transforms the one of the short circuit or open circuit impedance of the second filter to the other one of the short circuit or open circuit impedance of the second communication assembly at the second port, when the first radio signals are transduced.

33. The method of claim 31 wherein the second filter has an impedance at the second transformation element approaching one of a short circuit or an open circuit, and the first transformation element transforms the one of the short circuit or open circuit impedance of the second filter to the same one of the short circuit or open circuit impedance of the second communication assembly at the second port, when the first radio signals are transduced.

34. The method of claim 30 wherein providing a first communication assembly comprises providing a first communication assembly configured to operatively communicate low power radio frequency (LPRF) radio signals within the first frequency band via the antenna transducer, and wherein providing a second communication assembly comprises providing a second communication assembly configured to operatively communicate global positioning system (GPS) radio signals within the second frequency band via the antenna transducer.

35. The method of claim 25, wherein providing an antenna transducer comprises providing an antenna transducer including a primary transducer portion and a second transducer portion, the primary transducer portion being configured to effectuate communication in accordance with a cellular communication technique, wherein the secondary transducer portion includes transducer portion, first and second feed line contacts, and the first port and the second port.

36. The method of claim 25, wherein providing the apparatus comprises providing an apparatus including first and second ports comprising galvanic couplings of the antenna transducer to the same surface of the substrate.

37. An apparatus comprising:

an antenna transducer including a first port and a second port that is physically separated from the first port, wherein the antenna transducer further includes a transducer portion having an open end, a first feed line contact projecting from the transducer portion and engaging the first port, and a second feed line contact projecting from the transducer portion and engaging the second port, the first and second feed line contacts being positioned along the transducer portion at respective lengths from the open end of the transducer portion,

wherein the sum of the length of the transducer portion from the open end to the first feed line contact, and the length of the first feed line contact, is equal to approximately an integer multiple of one-quarter wavelength of the first radio signals within the first frequency band, wherein the sum of the length of the transducer portion from the open end to the second feed line contact, and the length of the second feed line contact, is equal to an integer multiple of approximately one-quarter wavelength of the second radio signals within the second frequency band,

wherein the antenna transducer is configured to selectively transduce at least one of first radio signals at least one of to or from the first port within a first frequency band, or second radio signals at least one of to or from the second port within a second frequency band, and wherein the antenna transducer is configured such that an impedance at the second port approaches one of a short circuit or an open circuit when the antenna transducer transduces the first radio signals, and such that an impedance at the first port approaches an open circuit when the antenna transducer transduces the second radio signals.

38. The apparatus of claim 37 further comprising:

a first communication assembly coupled to the antenna transducer at the first port of the antenna transducer, wherein the first communication assembly is configured to operatively communicate the first radio signals within a first frequency band via the antenna transducer, and

wherein the antenna transducer is configured such that the first communication assembly has an impedance at the first port approaching an open circuit when the antenna transducer transduces the second radio signals.

39. An apparatus comprising:

an antenna transducer comprising a first port and a second port that is physically separated from the first port, wherein the antenna transducer further includes a transducer portion having an open end, a first feed line contact projecting from the transducer portion and engaging the first port, and a second feed line contact projecting from the transducer portion and engaging the second port, the first and second feed line contacts being positioned along the transducer portion at respective lengths from the open end of the transducer portion, wherein the sum of the length of the transducer portion from the open end to the first feed line contact, and the length of the first feed line contact, is equal to approximately an integer multiple of one-quarter wavelength of the first radio signals within the first frequency band, wherein the sum of the length of the transducer portion from the open end to the second feed line contact, and the length of the second feed line contact, is equal to approximately an integer multiple of one-quarter wavelength of the second radio signals within the second frequency band, and wherein the antenna transducer is configured to selectively transduce at least one of first radio signals at least one of to or from the first port within a first frequency band, or second radio signals at least one of to or from the second port within a second frequency band;

a communication module configured to operatively communicate radio signals within a frequency band via the antenna transducer; and

a transformation element coupled to the communication module and the first port of the antenna transducer, and

wherein at least one of the communication module or transformation element are configured such that, when the antenna transducer transduces the second radio signals, an impedance at the first port approaches one of a short circuit or an open circuit.

40. The apparatus of claim 39, wherein the communication module comprises a communication circuitry and a filter, wherein the filter is coupled between the communication circuitry and the transformation element, and the transformation element is coupled to the first port of the antenna transducer, and

wherein at least one of the filter or the transformation element are configured such that, when the antenna transducer transduces the second radio signals, the transformation element transforms an impedance of the filter at the transformation element to the one of the short circuit or open circuit impedance at the first port.

41. A method comprising:

providing an apparatus comprising;

an antenna transducer including a first port and a second port that is physically separated from the first port, the antenna transducer further including a transducer portion having an open end, a first feed line contact projecting from the transducer portion and engaging the first port, and a second feed line contact projecting from the transducer portion and engaging the second port, the first and second feed line contacts being positioned along the transducer portion at respective lengths from the open end of the transducer portion, wherein the sum of the length of the transducer portion from the open end to the first feed line contact, and the length of the first feed line contact, is equal to approximately an integer multiple of one-quarter wavelength of the first radio signals within the first frequency band, and wherein the sum of the length of the transducer portion from the open end to the second feed line contact, and the length of the second feed line contact, is equal to approximately an integer multiple of one-quarter wavelength of the second radio signals within the second frequency band; and

selectively transducing at least one of first radio signals at least one of to or from the first port within a first frequency band, or second radio signals at least one of to or from the second port within a second frequency band, an impedance at the second port approaching one of a short circuit or an open circuit when the first radio signals are transduced, and an impedance at the first port approaching an open circuit when the second radio signals are transduced.

42. The method of claim 41 further comprising:

providing a first communication assembly coupled to the antenna transducer at the first port of the antenna transducer, wherein the first communication assembly is configured to operatively communicate the first radio signals within a first frequency band via the antenna transducer, and

wherein the first communication assembly has an impedance at the first port approaching an open circuit when the second radio signals are transduced.