PRINTED ANTENNA HAVING A DUAL-BEAM DIAGRAM

• US 20090224980A1
• Filed: 01/29/2009
• Published: 09/10/2009
• Est. Priority Date: 01/30/2008
• Status: Active Grant

• Current Assignee: Bouygues Telecom (Bouygues SA)
• Original Assignee: Bouygues Telecom (Bouygues SA)
• Inventors: Dessarce, Jean Philippe, Himdi, Mohamed, Colombel, Franck, Cruz, Eduardo Motta
• Granted Patent: US 8,502,734 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• 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 25/04 Multimode antennas corrugated horns H01Q13/0208
• CPC Class Codes: H01Q 9/045 with particular feeding means for circular polarisation H01Q9/0428

Abstract

The invention relates to a printed antenna comprising a ground plane, a substrate stacked to the ground plane, a metal deposit made on the substrate in order to form therein a resonating patch (3), and a means of supplying to excite the resonating patch, characterised in that the patch has dimensions that are adapted for the patch to be able to radiate in both upper electromagnetic modes TM₀₂ and TM₂₀, and in that the means of supplying makes it possible to excite the patch on an excitation point (4) arranged along the patch so that the patch resonates in a single of said upper electromagnetic modes, by inducing this way a dual-beam radiation diagram with, in the same plane orthogonal to the patch, two main misaligned and symmetric lobes in relation to the normal to the patch.

Claims

1. Printed antenna comprising a ground plane (P), a substrate (S) stacked to the ground plane, a metal deposit made on the substrate in order to form therein a resonating patch (3, 6, 7, 10, P), and a means of supplying to excite the resonating patch, characterised in that the patch has dimensions that are adapted so that the patch is able to radiate in both upper electromagnetic modes TM₀₂ and TM₂₀, and in that the means of supplying make it possible to excite the patch on an excitation point (4, 8, 9, 11-15, E) arranged in such a way that the patch resonates in a single of said upper electromagnetic modes, by inducing in this way a dual-beam radiation diagram with, in the same plane orthogonal to the patch, two main misaligned lobes that are symmetric in relation to the normal to the patch.

2. Antenna set forth in claim 1, wherein the patch is square of side substantially equal to k*λ

S where k is a strictly positive integer and λ

S shows the wavelength in the substrate.

3. Antenna set forth in claim 2, wherein the excitation point is substantially located at ¾

of one of the sides of the patch.

4. Antenna according to one of claims 1 to 3, wherein the means of supplying supplies the patch via coupling.

5. Antenna set forth in claim 4, wherein a coupling slot is cut in the ground plane.

6. Antenna according to one of claims 1 to 3, wherein the means of supplying supplies the patch by contact.

7. Antenna set forth in claim 6, wherein the means of supplying is a microstrip line.

8. Antenna set forth in claim 6, wherein the means of supplying is a coaxial probe.

9. Antenna set forth in claim 8, further comprising means of compensation capacitive (5) aiming to weaken the inductive behaviour of the input impedance of the antenna supplied by coaxial probe.

10. Antenna set forth in claim 9, wherein the means of compensation capacitive (5) take the form of an extension of the patch around the excitation point.

11. Antenna set forth in claim 10, wherein the extension (5) has a surface substantially equal to that of a half-disk of radius R_e=4*h where h designates the thickness of the substrate.

12. Antenna set forth in claim 11, wherein the extension is a half-disk (5).

13. Antenna set forth in claim 12, wherein the excitation point (4) is positioned midway between the side of the patch (6) and the edge of the half-disk (5).

14. Antenna according to one of claims 1 to 3, wherein the patch (7) has a first (8) and second (9) excitation points on orthogonal sides of the patch so that the patch can resonate in a first upper mode in a first plane orthogonal to the patch when it is excited from the first excitation point and in a second upper mode in a second plane orthogonal to the patch and to the first plane when it is excited from the second excitation point, the means of supplying being configured to alternatively excite the patch from the first and from the second excitation points.

15. Antenna according to one of claims 1 to 3, wherein the patch (10) has four excitation points (11-15) arranged each on one side of the patch, the means of supplying being configured to excite the patch by sequentially supplying the excitation points, the patch having as such a conical radiation diagram.

16. Antenna according to claim 1, characterised in that it is optically transparent to visible light.