Antenna with polarization diversity

• US 7,084,833 B2
• Filed: 09/02/2004
• Issued: 08/01/2006
• Est. Priority Date: 09/12/2003
• Status: Expired due to Fees

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Louzir, Ali, Pintos, Jean-Francois, Robert, Jean-Luc, Thudor, Franck, Mocquard, Olivier
• Primary Examiner(s): Nguyen, Hoang V.
• Application Number:
  US10/932,959
• Publication Number:
  US 20050057419A1
• Time in Patent Office: 698 Days
• Field of Search: 343/700.MS, 343/795, 343/850, 343/853, 343/876, 343/756
• US Class Current: 343/876
• CPC Class Codes: H01Q 21/245 provided with means for varying the polarisation polarising devices H01Q15/24; tracking by comparing linear polarisation compounds G01S3/146; reducing depolarisation effects H04B7/00; polarisation diversity H04B7/10
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

The antenna, particularly for portable televisions, comprises two ports coupled to a radiating element (11), the two ports being placed on the radiating element at 90° to each other and at 45° relative to a horizontal plane. The two ports are linked to a broadband switching and phase shifting circuit controlled in order to supply a polarization diversity signal as output.

Claims

1. A polarization diversity antenna, comprising two separate radiating elements, each radiating element being coupled through a port to a probe, the probes being oriented at 90°

to each other and at 45°

to a horizontal plane, the two ports being linked to a broadband switching and phase shifting circuit controlled to supply a polarization diversity signal at the output.

2. An antenna according to claim 1, wherein it comprises two radiating elements in the form of two coplanar radiating half-discs, the edges of which are oriented at 90°

to each other, each probe extending along the edge of a half-disc.

3. An antenna according to claim 2, wherein each radiating element in the form of a half-disc is coupled to a cone-shaped ground plane.

4. An antenna according to claim 1, comprising two radiating elements in the form of two radiating spheres, the axes of revolution of which are oriented at 90°

to each other, each probe extending along the axis of revolution of a radiating sphere.

5. An antenna according to claim 4, wherein each radiating element in the form of a sphere is coupled to a cone-shaped ground plane.

6. An antenna according to claim 1, wherein the radiating element is divided into two mechanically separate parts designed to be incorporated respectively in the right and left sides of a television in order to produce spatial diversity.

7. An antenna according to claim 1, further comprising a balanced low-noise amplifier linked to the broadband switching and phase shifting circuit via a matching circuit designed to offset matching losses in the bottom part of the antenna'"'"'s receive spectrum.

8. An antenna according to claim 7, wherein the matching circuit comprises a high-pass network designed to control the matching of the low-noise amplifier in the degraded frequency domain and a passive phase shifting circuit designed to control the maximum amplitude of mismatches throughout the antenna'"'"'s useful frequency band.

9. An antenna according to claim 8, wherein the passive phase shifting circuit is a microstrip line.

10. An antenna according to claim 7, wherein the balanced low-noise amplifier comprises hybrid couplers at the input and at the output.

11. A polarization diversity antenna comprising a radiating element, said radiating element being coupled through two ports to two probes, the probes being oriented at 90°

to each other and at 45°

to a horizontal plane, the two probes being linked to a broadband switching and phase shifting circuit controlled to supply a polarization diversity at the output.

12. An antenna according to claim 11, wherein the radiating element takes the form of a radiating discs, the the two probes extending radially to the circumference of the radiating disc, at 90°

to each other.

13. An antenna according to claim 12, wherein the radiating element in the form of a disc is coupled to a ground plane formed by two discs that are coplanar to each other and with the disc forming the radiating element.

14. An antenna according to claim 11, further comprising a balanced low-noise amplifier linked to the broadband switching and phase shifting circuit via a matching circuit designed to offset matching losses in the bottom part of the antenna'"'"'s receive spectrum.

15. An antenna according to claim 14, wherein the matching circuit comprises a high-pass network designed to control the matching of the low-noise amplifier in the degraded frequency domain and a passive phase shifting circuit designed to control the maximum amplitude of mismatches throughout the antenna'"'"'s useful frequency band.

16. An antenna according to claim 15, wherein the passive phase shifting circuit is a microstrip line.

17. An antenna according to claim 16, wherein the balanced low-noise amplifier comprises hybrid couplers at the input and at the output.