Antenna which can be operated in a number of frequency bands

• US 20030117340A1
• Filed: 02/12/2003
• Published: 06/26/2003
• Est. Priority Date: 09/16/1998
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: BenQ Corporation (Qisda Corporation)
• Inventors: Nevermann, Peter, Sheng-Gen, Pan
• Granted Patent: US 6,888,514 B2
• Time in Patent Office: Days
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 1/362 for broadside radiating helical antennas
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

An antenna which can be operated in a number of frequency bands and has at least one part which encloses an area and at least one part which does not enclose an area, with the at least two parts including a single conductor part being connected in series with one another, and the at least two parts interacting with one another in such a manner that the antenna has at least two resonant frequencies in a definable position, and with each at the same time having a wide bandwidth.

Claims

1. An antenna for operation in a plurality of predetermined frequency bands, comprising:

at least one first part which encloses an area; and

at least one second part which does not enclose an area;

wherein the at least one first part and the at least one second part are coupled together in series with one another, and wherein the at least one first part and the at least one second part are so configured and arranged that the antenna has at least first and second resonant frequencies within the plurality of predetermined frequency bands, the at least one first part substantially defining the first resonant frequency and the at least one second part substantially defining the second resonant frequency.

2. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the antenna operates with a wide bandwidth close to the first resonant frequency for use in a first intended frequency band and operates with a wide bandwidth close to the second resonant frequency for use in two further intended frequency bands.

3. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 2, wherein the antenna has a characteristic impedance of approximately 50 ohms in the intended frequency bands.

4. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least one first part has a helical shape.

5. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least one second part is in the form of a rod.

6. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least one second part is in the form of a rod which is bent in a meandering shape in a plane.

7. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least one first part and the at least one second part are physically positioned one behind the other.

8. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least one first part has a lower resonant frequency than the at least one second part.

9. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least first and second resonant frequencies of the antenna are defined such that the antenna is operable in frequency bands of a plurality of mobile radio networks.

10. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 9, wherein the frequency bands of the plurality of mobile radio networks include those associated with the GSM, PCN and PCS standards.

11. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 10, wherein a resonant frequency of the antenna in the frequency band of the GSM standard is achieved primarily by the at least one first part, and a resonant frequency of the antenna in the frequency bands of the PCN and PCS standards is achieved primarily by the at least one second part.

12. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein the at least one first part and the at least one second part are formed of a single conductor part.

13. An antenna for operation in a plurality of predetermined frequency bands as claimed in claim 1, wherein first and second resonant frequencies of the at least two resonant frequencies each has a wide bandwidth.

14. A multi-frequency band antenna for operation in a plurality of predetermined frequency bands, comprising:

a first antenna element defining a three-dimensional shape; and

a second antenna element defining one of a linear shape and a two-dimensional shape, and electrically connected to the first antenna element in series;

the first and second antenna elements so configured and arranged to define at least first and second resonant frequencies within the plurality of predetermined frequency bands, the first antenna element substantially defining the first resonant frequency and the second antenna element substantially defining the second resonant frequency.

15. A multi-frequency band antenna according to claim 14, wherein the first resonant frequency is within a first frequency band of the plurality of predetermined frequency bands, and

wherein the second resonant frequency is within second and third frequency bands of the plurality of predetermined frequency bands.

16. A multi-frequency band antenna accordingly to claim 15, wherein the antenna has an impedance of approximately 50 ohms in the first, second, and third frequency bands.

17. A multi-frequency band antenna according to claim 14, wherein the first antenna element has a helical shape.

18. A multi-frequency band antenna according to claim 14, wherein the second antenna element is in the form of a rod.

19. A multi-frequency band antenna according to claim 14, wherein the second antenna element has a meandering shape.

20. A multi-frequency band antenna according to claim 14, wherein the first and second antenna elements are positioned directly one behind the other.

21. A multi-frequency band antenna according to claim 14, wherein the first antenna element has a lower resonant frequency than the second antenna element.

22. A multi-frequency band antenna according to claim 14, wherein the at least first and second resonant frequencies are defined such that the antenna is operable in frequency bands of a plurality of mobile radio networks.

23. A multi-frequency band antenna according to claim 22, wherein the frequency bands of the plurality of mobile radio networks comprise the GSM, PCN and PCS standards.

24. A multi-frequency band antenna according to claim 23, wherein a resonant frequency of the antenna in the frequency band of GSM standard is achieved primarily by the first antenna element, and a resonant frequency of the antenna in the frequency bands of PCN and PCS standards is achieved primarily by the second antenna element.

25. A multi-frequency band antenna according to claim 14, wherein the first and second antenna elements are formed of a single conductor part.

26. A multi-frequency band antenna according to claim 14, wherein the at least first and second resonant frequencies each has wide bandwidth.

27. A multi-frequency band antenna according to claim 14, wherein the first and second antenna elements are so configured and arranged to define the first resonant frequency as from about 900 MHz to about 1,000 MHz, and the second resonant frequency as from about 1,800 MHz to about 1,900 MHz.

28. A method of making an antenna, comprising the steps of:

providing a first antenna element having a three-dimensional shape in series with a second antenna element which does not have a three-dimensional shape; and

constructing the first and second antenna elements such that the antenna has at least first and second different predetermined resonant frequencies in which the first antenna element substantially defines the first resonant frequency and the second antenna element substantially defines the second resonant frequency.

29. A method of making an antenna according to claim 28, further comprising the step of forming the first and second antenna elements from a single conductor.

30. A method of making an antenna according to claim 28, further comprising the step of forming the second antenna element in a linear shape.

31. A method of making an antenna according to claim 28, further comprising the step of forming the second antenna element in a planer shape.

32. A method of making an antenna according to claim 31, further comprising the step of forming the second antenna element in a meandering shape.

33. A method of making an antenna according to claim 28, wherein the constructing step further comprises the step of providing the antenna with the first resonant frequency of from about 900 MHz to about 1,000 MHz, and the second resonant frequency of from about 1,800 MHz to about 1,900 MHz.

34. A method of operating an antenna, comprising the steps of:

a) providing first and second antenna elements connected together in series;

b) allowing the first and second antenna elements to cooperatively resonant within a first frequency band substantially defined by the first antenna element; and

c) allowing the first and second antenna elements to cooperatively resonant within a second frequency band substantially defined by the second antenna element and different from the first frequency band.

35. The method of operating an antenna according to claim 34, wherein step (b) further comprises the step of allowing the antenna to resonant at a frequency of from about 900 MHz to about 1,000 MHz.

36. The method of operating an antenna according to claim 35, wherein step (c) further comprises the step of allowing the antenna to resonant at a frequency of from about 1,800 MHz to about 1,900 MHz.

37. The method of operating an antenna according to claim 36, wherein step (a) further comprises the steps of:

providing the first antenna element with a three-dimensional shape; and

providing the second antenna element with a linear shape.

38. The method of operating an antenna according to claim 36, wherein step (a) further comprises the steps of:

providing the first antenna element with a three-dimensional shape; and

providing the second antenna element with a meandering shape.