Mobile communication handset with adaptive antenna array

• US 20050156797A1
• Filed: 03/14/2005
• Published: 07/21/2005
• Est. Priority Date: 03/14/2002
• Status: Active Grant

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Chiang, Bing, Snyder, Christopher A., Jorgenson, David C., Gothard, Griffin K.
• Granted Patent: US 7,190,313 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 19/30 the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
• CPC Class Codes: H01Q 19/32 the primary active element being end-fed and elongated
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• CPC Class Codes: H01Q 3/44 varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

A mobile communication handset includes at least one passive antenna element and an active antenna element adjacent to the passive antenna elements protruding from a housing. The active element is coupled to electronic radio communication circuits and the passive antenna elements are coupled to circuit elements that affect the directivity of communication signals coupled to the antenna elements.

Claims

1. A method of manufacturing a mobile communication handset, comprising:

disposing at least one passive antenna element on a first portion of a dielectric substrate, the at least one passive element having a base portion;

disposing an active antenna element on a second portion of the dielectric substrate adjacent to the at least one passive antenna element, the active element being coupled to electronic radio communication circuits, the active antenna element having a base portion;

disposing a switch between the at least one passive element and a ground structure, the switch controlling electromagnetic coupling therebetween in order to affect the directivity of communication signals coupled to the antenna elements, the ground structure having a shape that localizes a near field of the antenna elements toward the base portions of the antenna elements; and

disposing the dielectric substrate within a housing.

2. The method of claim 1, wherein the at least one passive antenna element and the active element are monopole antennas.

3. The method of claim 1, wherein the at least one passive antenna element and the active element are dipole antennas.

4. The method of claim 1, wherein the shape of the ground structure is a bent conductive strip.

5. The method of claim 1, wherein the shape of the ground structure is a conductive meander line.

6. The method of claim 1, wherein the shape of the ground structure is an inductor and a conductive strip.

7. The method of claim 1, wherein the shape of the ground structure is a ferrite loaded conductive strip.

8. The method of claim 1, wherein the shape of the ground structure is a dielectric loaded conductive strip.

9. The method of claim 1, wherein the shape of the ground structure is an image element.

10. The method of claim 9, wherein:

the at least one passive antenna element comprises a first conductive segment formed on the dielectric substrate;

the image element comprises a second conductive segment formed on the dielectric substrate, the at least one image element being disposed vertically adjacent to the at least one passive antenna element.

11. The method of claim 10, wherein:

the switch is disposed between the first conductive segment of the at least one passive antenna element and the second conductive segment of the image element, the switch controlling electromagnetic coupling therebetween.

12. The method of claim 11, wherein the switch comprises a semiconductor device.

13. The method of claim 12, wherein the switch further comprises a first impedance element in series with the second conductive segment of the image element when in a first switch position and a second impedance element in series with the second conductive segment of the image element when in a second switch position.

14. The method of claim 11, wherein the switch further comprises plural impedance elements, each of the plural impedance elements capable of being in series with the second conductive segment of the image element depending on a switch position.

15. The method of claim 11, wherein the switch controllably connects the first conductive segment to the second conductive segment such that the at least one passive antenna element operates in a reflective mode, and wherein the at least one passive antenna element otherwise operates in a directive mode.

16. The method of claim 1, wherein the at least one passive antenna element is located on an opposite face of the dielectric substrate than the active antenna element.

17. The method of claim 1, wherein the switch comprises plural impedance elements, the switch having two or more switch positions for controllably connecting one of the plural impedance elements in series between the at least one passive element and the ground structure, affecting the directivity of communication signals coupled to the antenna elements.

18. The method of claim 1, wherein the switch controls the active and passive elements to operate selectively as either an omnidirectional antenna array in one state, or as a directive antenna array in another state.

19. The method of claim 1, wherein the near field is localized by the ground structure having a shape that localizes current of the antenna elements toward the base portions of the antenna elements.