Array Antenna Having A Radiation Pattern With A Controlled Envelope, And Method Of Manufacturing It

• US 20140104107A1
• Filed: 04/12/2011
• Published: 04/17/2014
• Est. Priority Date: 04/12/2011
• Status: Active Grant

• Current Assignee: Agence Spatiale Europeenne
• Original Assignee: Agence Spatiale Europeenne
• Inventors: Mangenot, Cyril, Toso, Giovanni, Tienda Herrero, Carolina
• Granted Patent: US 10,062,966 B2
• Time in Patent Office: Days
• US Class Current: 342/371
• CPC Class Codes: H01P 11/00 Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
• CPC Class Codes: H01Q 21/22 Antenna units of the array energised non-uniformly in amplitude or phase, e.g. tapered array or binomial array
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H01Q 3/36 with variable phase-shifters
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A method for manufacturing an array antenna having a design phase, including synthesizing an array layout of the array antenna and choosing or designing radiating elements to be arranged according to the array layout; and a phase of physically making the array antenna, including arranging the radiating elements according to the array layout; the design phase having the steps of: a) synthesizing an array layout complying with a required minimum beamwidth, a required field of view, a required side lobe level and a target angular dependence of the maximum directivity of the array antenna over the required field of view; b) determining shaped radiation patterns of the radiating elements in order to approximate said target angular dependence of the maximum directivity of the array antenna over the required field of view; and c) choosing or designing radiating elements having the shaped radiation patterns determined at step b).

Claims

1. A method for manufacturing an array antenna comprising:

a design phase, comprising synthesizing an array layout of said array antenna and choosing or designing radiating elements to be arranged according to said array layout; and

a phase of physically making said array antenna, comprising arranging said radiating elements according to said array layout;

wherein said design phase comprises the steps of;

a) synthesizing an array layout complying with a required minimum beamwidth, a required side lobe level and a target angular dependence of the maximum directivity of the array antenna over said required field of view;

b) determining shaped radiation patterns of said radiating elements in order to approximate said target angular dependence of the maximum directivity of the array antenna over said required field of view; and

c) choosing or designing radiating elements having the shaped radiation patterns determined at said step b).

2. A method according to claim 1, wherein said steps a) and b) of said design phase are performed jointly.

3. A method according to claim 1, wherein said step a) of said design phase comprises synthesizing an aperiodic array layout.

4. A method according to claim 3, wherein said step c) of said design phase comprises choosing or designing radiating elements having different sizes, the size of each radiating element being related to spacing from nearby elements.

5. A method according to claim 1, wherein each of said radiating elements is chosen to belong to one among a plurality of subsets, each subset being constituted by radiating elements having a same radiation pattern, different from that of radiating elements belonging to different subsets.

6. A method according to claim 1, wherein the shaped radiation patterns determined at step b) of said design phase are such that their weighted average approximates said target angular dependence of the maximum directivity of the array antenna over said required field of view within a predetermined tolerance.

7. A method according to claim 1, wherein the shaped radiation patterns determined at said step b) of said design phase approximate said target angular dependence of the maximum directivity of the array antenna over said required field of view within a predetermined tolerance.

8. A method according to claim 1, wherein said target angular dependence of the maximum directivity of the array antenna is either flat over said required field of view, or increasing from the centre towards the edges of said required field of view.

9. A method according to claim 1, wherein said step c) of said design phase comprises choosing or designing radiating elements at least some of which are sub-arrays constituted by a plurality of elementary radiating elements.

10. An array antenna comprising a plurality of radiating elements (R) arranged according to an array layout, wherein said radiating elements have shaped radiation patterns whose weighted average is:

either flat within 35% or less over a required field of view (FOV);

or increasing from the center towards the edges of said required field of view;

said nominal field of view having a width of at least 5 times a minimum beamwidth determined by said array layout.

11. An array antenna according to claim 10, wherein said radiating elements have shaped radiation patterns which are themselves:

either flat within 35% or less over said nominal field of view;

or increasing from the center towards the edges of said nominal field of view.

12. An array antenna according to claim 10, further comprising a beam forming network (BFN) for feeding the radiating elements, said beam forming network being adapted for:

either scanning at least one beam over said required field of view;

or generating a plurality of beam pointing at different directions of said required field of view;

or generating a shaped beam covering said required field of view.

13. An array antenna according to claim 10, wherein each of said radiating elements belongs to one among a plurality of subsets, each subset being constituted by radiating elements having a same radiation pattern, different from that of radiating elements belonging to different subsets.

14. An array antenna according to claim 10, wherein said array layout is aperiodic.

15. An array antenna according to claim 14, wherein said radiating elements have different sizes, the size of each radiating element being related to spacing from nearby elements.

16. An array antenna according to claim 14, wherein said aperiodic array layout forms a sunflower lattice.

17. An array antenna according to claim 10, wherein at least some of said radiating elements are sub-arrays constituted by a plurality of elementary radiating elements.