Sub-reflector of a dual-reflector antenna

• US 8,102,324 B2
• Filed: 01/16/2009
• Issued: 01/24/2012
• Est. Priority Date: 01/18/2008
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Le Bayon, Armel, Tuau, Denis
• Primary Examiner(s): Nguyen, Hoang V
• Application Number:
  US12/355,114
• Publication Number:
  US 20090184886A1
• Time in Patent Office: 1,103 Days
• Field of Search: 343/781.P, 343/781.CA, 343/781.R, 343/786, 343/840, 343/775
• US Class Current: 343/781.P
• CPC Class Codes: H01Q 19/193 with feed supported subreflector splash plate feeds H01Q19/134

Abstract

The aim of the present invention is a sub-reflector of a dual-reflector antenna comprising:

• • a first end having a junction of a first diameter, adapted for coupling to the end of a waveguide,
  • a second end, having a second diameter greater than the first diameter,
  • a convex reflective internal surface placed at the second end having an axis of revolution,
  • an external surface of the same axis, joining the two ends,
  • a dielectric material extending between the first and the second ends and limited by the internal surface and the external surface,

In accordance with the invention, the external surface has a convex profile described by a polynomial equation of the sixth degree of the formula:
y=ax⁶+bx⁵+cx⁴+dx³+ex²+fx+g where a is not zero.

Claims

1. Sub-reflector of a dual-reflector antenna comprising:

a first end having a junction of a first diameter, adapted for coupling to the end of a waveguide (3),

a second end, having a second diameter greater than the first diameter,

a convex reflective internal surface (12) placed at the second end having an axis of revolution (13),

an external surface (14) of the same axis (13), joining the two ends,

a dielectric material (11) extending between the first and the second end and limited by the internal surface (12) and the external surface (13),

characterized in that the external surface (14) has a convex profile described by a polynomial equation of the sixth degree of the formula;

y=ax⁶+bx⁵+cx⁴+dx³+ex²+fx+g where a is not zero.

2. Sub-reflector in accordance with claim 1, wherein the external surface (22) comprises in addition a unique contour(21) in the shape of a ring surrounding the dielectric material (11).

3. Sub-reflector in accordance with claim 2, wherein the contour (21) projects in a direction perpendicular to the axis of revolution (23).

4. Dual-reflector antenna comprising a primary reflector (1) and an associated sub-reflector (2, 10,), characterized in that the sub-reflector (2, 10) comprises:

a first end having a junction of a first diameter, adapted for coupling to the end of a waveguide (3),

a second end, having a second diameter greater than the first diameter,

a convex reflective internal surface (12) placed at the second end having an axis of revolution (13),

an external surface (14) of the same axis (13), placed as close as possible to the primary reflector (1), having a convex profile described by a polynomial equation of the sixth degree of the formula;

y=ax⁶+bx⁵+cx⁴+dx³+ex²+fx+g where a is not zero,

a dielectric material (11) extending between the first and the second end and limited by the internal surface (12) and the external surface (14).

5. Dual-reflector antenna in accordance with claim 4, comprising a primary reflector (50) comprising a shroud, the shroud (51) and the primary reflector (50) being made of a single component.