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1. (WO2001031735) BALANCED, RETRACTABLE MOBILE PHONE ANTENNA
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CLAIMS

1. A balanced, retractable dipole antenna for use in a mobile phone having a casing, and a signal source, transmit and receive circuits, and a printed wire board (PWB) having a ground plane formed thereon for the signal source and for the transmit and receive circuits contained in the casing, comprising:
a first radiator element formed of a conducting material and being selectively extendable from and retractable into the casing;
a second radiator element formed of a conducting material;
a counterpoise formed of a conducting material and electrically isolated from the PWB ground plane;
a signal balancing means coupled between the signal source and at least said second radiator element and counterpoise to generate first and second signals, respectively, wherein said first and second signals are substantially equal in magnitude but out of phase by 180 degrees;
means for transferring said first signal to said second radiator element;
means for transferring said second signal to said counterpoise;
means for transferring said first signal to said first radiator element when said first radiator element is extended; and
means for transferring said second signal to said first radiator element when said first radiator element is retracted.

2. The balanced, retractable dipole antenna of claim 1, wherein said second radiator element is a helical conductor.

3. The balanced, retractable dipole antenna of claim 1, wherein said first radiator element is a whip conductor.

4. The balanced, retractable dipole antenna of claim 1, wherein said second radiator element is a substrate radiator.

5. The balanced, retractable dipole antenna of claim 1, wherein said means for transferring said first signal to said first radiator element comprises means for electromagnetically coupling said first radiator element to said second radiator element.

6. The balanced, retractable dipole antenna of claim 1, wherein said means for transferring said first signal to said first radiator element comprises means for electrically connecting said first radiator element to said signal balancing means.

7. The balanced, retractable dipole antenna of claim 6, wherein said means for electrically connecting said first radiator element to said signal balancing means comprises a conducting clip attached to said first radiating element.

8. The balanced, retractable dipole antenna as recited in claim 1, wherein said counterpoise is printed on the PWB.

9. The balanced, retractable dipole antenna as recited in claim 1, wherein said counterpoise is a conducting wire.

10. The balanced, retractable dipole antenna as recited in claim 1, wherein said counterpoise is a metallic strip.

11. The balanced, retractable dipole antenna as recited in claim 1, wherein said first and second signals are in cellular frequency band.

12. The balanced, retractable dipole antenna as recited in claim 1, wherein said first and second signals are in PCS frequency band.

13. The balanced, retractable dipole antenna as recited in claim 1, wherein the total length of the antenna is λ, where λ is the wavelength corresponding to an operating frequency.

14. The balanced, retractable dipole antenna as recited in claim 1, wherein the total length of the antenna is λ/2, where λ is the wavelength corresponding to an operating frequency.

15. The balanced, retractable dipole antenna as recited in claim 1, wherein the total length of the antenna when said first radiating element is extended is substantially equal to the total length of the antenna when said first radiating element is retracted.

16. A balanced, retractable dipole antenna for use in a mobile phone having a casing, and a signal source, transmit and receive circuits, and a printed wire board (PWB) having a ground plane formed thereon for the signal source and for the transmit and receive circuits contained in the casing, comprising:
a composite radiator element that is selectively extendable from and retractable into the casing having a first radiating element formed of a conducting material, a connecting element coupled to said first radiating element, and a second radiating element formed of a conducting material coupled to said connecting element, wherein said connecting element electrically connects said first and second radiating elements when said composite radiator is extended and electrically disconnects said first and second radiating elements when said composite radiator is retracted;
a counterpoise formed of a conducting material and electrically isolated from the PWB ground plane;
a signal balancing means coupled between the signal source and at least said second radiator element and counterpoise to generate first and second signals, respectively, that are substantially equal in magnitude but out of phase by 180 degrees;
means for transferring said first signal to said first radiator element and said second radiating element when said composite radiator element is extended; and means for transferring said first signal to said second radiator element and said second signal to said first radiator element when said composite radiator element is retracted.

17. The balanced, retractable dipole antenna of claim 16, wherein said second radiator element is a helical conductor.

18. The balanced, retractable dipole antenna of claim 16, wherein said first radiator element is a whip conductor.

19. The balanced, retractable dipole antenna as recited in claim 16, wherein said counterpoise is printed on the PWB.

20. The balanced, retractable dipole antenna as recited in claim 16, wherein said counterpoise is a conducting wire.

21. The balanced, retractable dipole antenna as recited in claim 16, wherein said counterpoise is a metallic strip.

22. The balanced, retractable dipole antenna as recited in claim 16, wherein said first and second signals are in cellular frequency band.

23. The balanced, retractable dipole antenna as recited in claim 16, wherein said first and second signals are in PCS frequency band.

24. The balanced, retractable dipole antenna as recited in claim 16, wherein the total length of the antenna is λ, where λ is the wavelength corresponding to an operating frequency.

25. The balanced, retractable dipole antenna as recited in claim 16, wherein the total length of the antenna is λ,/2, where λ, is the wavelength corresponding to an operating frequency.

26. The balanced, retractable dipole antenna as recited in claim 16, wherein the total length of the antenna when said composite radiating element is extended is substantially equal to the total length of the antenna when said composite radiating element is retracted.