Multi-band monopole antennas for mobile network communications devices

• US 20070152887A1
• Filed: 01/28/2005
• Published: 07/05/2007
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: Fractus SA
• Original Assignee: Fractus SA
• Inventors: Borau, Carmen, Baliarda, Carles, Castany, Jordi
• Granted Patent: US 7,417,588 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

Multiband monopole antennas are disclosed. The antennas disclosed can include a substrate for mounting conductors, one or more conductors for receiving networking signals mainly in a first frequency band, and one or more conductors for receiving networking signals mainly in a second frequency band. The conductors can have a polygonal shape or the conductors can have a linear, space-filling, or grid dimension shape. The conductors can be connected at a feed point. One or more antenna can be incorporated into a single printed circuit board. When multiple antennas are used with the same printed circuit board, the conducting material of the printed circuit board located between the antenna attachment points can be interrupted to improve the isolation of each antenna.

Claims

1. A multi-band monopole antenna, comprising:

an antenna substrate;

a first conductor for receiving networking signals in the frequency range of about 4.9 GHz to about 5.875 GHz, said first conductor having a polygonal shape with an aspect ratio of length to width of less than about 5 to about 1;

a second conductor for receiving networking signals in the frequency range of about 2.4 GHz to about 2.5 GHz, said second conductor adopting a linear, space-filling, or grid dimension shape; and

a feeding point for connecting the first conductor and the second conductor.

2. The multi-band monopole antenna of claim 1, wherein the first conductor has one or more notches where material is removed from the polygonal shape for matching the impedance of the antenna.

3. The multi-band monopole antenna of claim 1, wherein the first conductor has an aspect ratio of less than about 3 to about 1.

4. The multi-band monopole antenna of claim 1, wherein the first conductor has an aspect ratio of less than about 2 to about 1.

5. The multi-band monopole antenna of claim 1, wherein the first conductor has an aspect ratio of about 3 to about 2.

6. The multi-band monopole antenna of claim 1, wherein the first conductor receives network signals in the 802.11a band.

7. The multi-band monopole antenna of claim 1, wherein the second conductor receives network signals in the 802.11bg band.

8. The multi-band monopole antenna of claim 1, wherein the substrate comprises a 10 mm×

10 mm×

0.8 mm circuit board with a copper base conductor.

9. A printed circuit board comprising one or more of the multi-band monopole antennas of claim 1.

10. The printed circuit board of claim 9, wherein two or more multi-band monopole antennas are used and conducting material of the printed circuit board located between the antenna attachment points is interrupted.

20. The printed circuit board of claim 9, wherein two or more symmetrical multi-band monopole antennas are used and conducting material of the printed circuit board located between the antenna attachment points is interrupted.

11. A symmetrical multi-band monopole antenna, comprising:

an antenna substrate;

first and second conductors for receiving networking signals in the frequency range of about 4.9 GHz to about 5.875 GHz, said first and second conductors having symmetrical polygonal shapes with an aspect ratio of length to width of less than about 5 to about 1;

third and fourth conductors for receiving networking signals in the frequency range of about 2.4 GHz to about 2.5 GHz, said third and fourth conductors adopting symmetrical linear, space-filling, or grid dimension shapes; and

a feeding point for connecting the first, second, third and fourth conductors,

wherein the first and second conductors are symmetrically oriented with respect to each other about a central axis on the antenna substrate and the third and fourth conductors are symmetrically oriented with respect to each other about the central axis on the antenna substrate.

12. The symmetrical multi-band monopole antenna of claim 11, wherein the first and second conductors have one or more notches where material is removed from the polygonal shape for matching the impedance of the antenna.

13. The symmetrical multi-band monopole antenna of claim 11, wherein the first and second conductors each have an aspect ratio of less than about 3 to about 1.

14. The symmetrical multi-band monopole antenna of claim 11, wherein the first and second conductors each have an aspect ratio of less than about 2 to about 1.

15. The symmetrical multi-band monopole antenna of claim 11, wherein the first and second conductors each have an aspect ratio of about 3 to about 2.

16. The symmetrical multi-band monopole antenna of claim 11, wherein the first and second conductor receives network signals in the 802.11a band.

17. The symmetrical multi-band monopole antenna of claim 11, wherein the second and third conductors receive network signals in the 802.11bg band.

18. The symmetrical multi-band monopole antenna of claim 11, wherein the substrate comprises a 10 mm×

10 mm×

0.8 mm circuit board with a copper base conductor.

19. A printed circuit board comprising one or more of the symmetrical multi-band monopole antennas of claim 11.