Flat dual frequency band antennas for wireless communicators

• US 6,204,826 B1
• Filed: 07/22/1999
• Issued: 03/20/2001
• Est. Priority Date: 07/22/1999
• Status: Expired due to Term

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Hayes, Gerard James, Rutkowski, Kim
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): TRAN, THUY V
• Application Number:
  US09/359,729
• Time in Patent Office: 607 Days
• Field of Search: 343/895, 343/702, 343/700.MS, 343/872, 343/793, 343/803, 343/804, 343/866, 455/90
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A dual frequency band antenna includes a dielectric substrate having opposite first and second surfaces and a meandering conductive trace disposed on a surface of the dielectric substrate. The meandering conductive trace includes first and second meandering segments that are configured to electrically couple with each other such that the antenna resonates within two separate and distinct frequency bands. At least one of the first and second meandering segments has a portion with an increased width compared with the width of the conductive trace.

Claims

1. A multiple frequency band antenna, comprising:

a dielectric substrate comprising opposite first and second surfaces;

a feed point disposed on the dielectric substrate; and

a meandering conductive trace disposed on the dielectric substrate first surface, comprising;

a first end electrically connected to the feed point and an opposite free end;

an intermediate segment between the first end and the free end, comprising a pair of elongate parallel legs that define a longitudinal direction;

a first meandering segment extending from the first end to the intermediate segment, comprising a pair of elongate converging legs in spaced-apart adjacent relationship with the pair of elongate parallel legs of the intermediate segment, and that converge along the longitudinal direction;

a second meandering segment extending from the intermediate segment to the free end;

wherein the first and second meandering segments are configured to electrically couple with each other such that the antenna resonates within at least two separate and distinct frequency bands; and

wherein a portion of at least one of the conductive trace first and second meandering segments has a second width greater than the first width.

2. A multiple frequency band antenna according to claim 1 wherein the intermediate segment is spaced apart from the conductive trace first end by a distance of less than or equal to about 2 millimeters (mm).

3. A multiple frequency band antenna according to claim 1 further comprising a conductive element disposed on the dielectric substrate second surface, wherein the conductive element is configured to parasitically couple with at least one of the conductive trace first and second meandering segments.

4. A multiple frequency band antenna according to claim 3 wherein the conductive element is disposed on the dielectric substrate second surface in overlying juxtaposition with at least one of the conductive trace first and second meandering segments.

5. A multiple frequency band antenna according to claim 1 wherein the conductive trace first and second meandering segments have different respective electrical lengths.

6. A multiple frequency band antenna, comprising:

a dielectric substrate comprising opposite first and second surfaces;

a feed point disposed on the dielectric substrate; and

a meandering conductive trace having a substantially constant first width disposed on the dielectric substrate first surface, comprising;

a first end electrically connected to the feed point and an opposite free end;

an intermediate segment between the first end and the free end, comprising a pair of elongate parallel legs that define a longitudinal direction, wherein the intermediate segment is spaced apart from the conductive trace first end by a distance of less than or equal to about 2 millimeters (mm);

a first meandering segment extending from the first end to the intermediate segment, comprising a pair of elongate converging legs in spaced-apart adjacent relationship with the pair of elongate parallel legs of the intermediate segment, and that converge along the longitudinal direction;

a second meandering segment extending from the intermediate segment to the free end;

wherein the first and second meandering segments are configured to electrically couple with each other such that the antenna resonates within at least two separate and distinct frequency bands;

wherein a portion of at least one of the conductive trace first and second meandering segments has a second width greater than the first width; and

a conductive element disposed on the dielectric substrate second surface, wherein the conductive element is configured to parasitically couple with at least one of the conductive trace first and second meandering segments.

7. A multiple frequency band antenna according to claim 6 wherein the conductive element is disposed on the dielectric substrate second surface in overlying juxtaposition with at least one of the conductive trace first and second meandering segments.

8. A multiple frequency band antenna according to claim 6 wherein the conductive trace first and second meandering segments have different respective electrical lengths.

9. A wireless communicator, comprising:

a housing configured to enclose a transceiver that transmits and receives wireless communications signals; and

a multiple frequency band antenna electrically connected with the transceiver, comprising;

a dielectric substrate comprising opposite first and second surfaces;

a feed point disposed on the dielectric substrate; and

a meandering conductive trace having a substantially constant first width disposed on the dielectric substrate first surface, comprising;

a first end electrically connected to the feed point and an opposite free end;

an intermediate segment between the first end and the free end, comprising a pair of elongate parallel legs that define a longitudinal direction;

a first meandering segment extending from the first end to the intermediate segment, comprising a pair of elongate converging legs in spaced-apart adjacent relationship with the pair of elongate parallel legs of the intermediate segment, and that converge along the longitudinal direction;

a second meandering segment extending from the intermediate segment to the free end;

wherein the first and second meandering segments are configured to electrically couple with each other such that the antenna resonates within two separate and distinct frequency bands; and

wherein a portion of at least one of the conductive trace first and second meandering segments has a second width greater than the first width.

10. A wireless communicator according to claim 9 wherein the intermediate segment is spaced apart from the conductive trace first end by a distance of less than or equal to about 2 millimeters (mm).

11. A wireless communicator according to claim 9 further comprising a conductive element disposed on the dielectric substrate second surface, wherein the conductive element is configured to parasitically couple with at least one of the conductive trace first and second meandering segments.

12. A wireless communicator according to claim 11 wherein the conductive element is disposed on the dielectric substrate second surface in overlying juxtaposition with at least one of the conductive trace first and second meandering segments.

13. A wireless communicator according to claim 9 wherein the conductive trace first and second meandering segments have different respective electrical lengths.

14. A wireless communicator, comprising:

a housing configured to enclose a transceiver that transmits and receives wireless communications signals; and

a multiple frequency band antenna electrically connected with the transceiver, comprising;

a dielectric substrate comprising opposite first and second surfaces;

a feed point disposed on the dielectric substrate; and

a meandering conductive trace having a substantially constant first width disposed on the dielectric substrate first surface, comprising;

a first end electrically connected to the feed point and an opposite free end;

an intermediate segment between the first end and the free end, comprising a pair of elongate parallel legs that define a longitudinal direction, wherein the intermediate segment is spaced apart from the conductive trace first end by a distance of less than or equal to about 2 millimeters (mm);

a first meandering segment extending from the first end to the intermediate segment, comprising a pair of elongate converging legs in spaced-apart adjacent relationship with the pair of elongate parallel legs of the intermediate segment, and that converge along the longitudinal direction;

a second meandering segment extending from the intermediate segment to the free end;

wherein the first and second meandering segments are configured to electrically couple with each other such that the antenna resonates within two separate and distinct frequency bands;

wherein a portion of at least one of the conductive trace first and second meandering segments has a second width greater than the first width; and

a conductive element disposed on the dielectric substrate second surface, wherein the conductive element is configured to parasitically couple with at least one of the conductive trace first and second meandering segments.

15. A wireless communicator according to claim 14 wherein the conductive element is disposed on the dielectric substrate second surface in overlying juxtaposition with at least one of the conductive trace first and second meandering segments.

16. A wireless communicator according to claim 14 wherein the conductive trace first and second meandering segments have different respective electrical lengths.