Modular array and phased array antenna system

• US 5,923,289 A
• Filed: 07/28/1997
• Issued: 07/13/1999
• Est. Priority Date: 07/28/1997
• Status: Expired due to Term

• Current Assignee: CDC Propriete Intellectuelle
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Buer, Kenneth Vern, Locke, John Wesley, Kreutel, R. William, Chiavacci, Paul Adrian, DiFonzo, Daniel Francis
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): PHAN, DAO LINDA
• Application Number:
  US08/901,745
• Time in Patent Office: 715 Days
• Field of Search: 342/81, 342/154, 342/157, 342/368, 342/372, 342/373
• US Class Current: 342/373
• CPC Class Codes: H01Q 21/0025 Modular arrays
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays

Abstract

A modular phased array antenna for the formation of simultaneous independently steerable multiple beams, the modular phased array antenna comprising a modular array including a plurality of sub-array modules combined together in close proximity, each one of the plurality of sub-array modules including a plurality of input modules, a layer of a plurality of radiating antenna elements, a plurality of stacked beamformers arranged in series and each connected to one of the plurality of input modules and to the plurality of radiating antenna elements in beam communication.

Claims

1. A modular beamformer for providing millimeter-wave signals to a plurality of radiating elements of a phased array antenna, the beamformer comprising:

a plurality of substantially identical beamformer modules arranged in a stacked configuration, each beamformer module being in a primary plane; and

a plurality of feeder lines extending through each beamformer module of the plurality, each feeder line coupled to one of the radiating elements,

wherein each beamformer module comprises;

a plurality of Gallium Arsenide (GaAs) Monolithic Microwave Integrated Circuit (MMIC) phase shifter elements for providing phase-shifted signals to more than one of the feeder lines; and

an input signal path interconnecting each one of the plurality of phase shifter elements,

wherein each feeder line is arranged in a secondary plane substantially perpendicular the primary plane, each one of the feeder lines comprising a dielectrically loaded wave guide.

2. The modular beamformer of claim 1, wherein the input signal path provides a substantially equal pathlength between each one of the plurality of phase shifter elements and an input signal source.

3. The beamformer of claim 2, wherein each one of the plurality of GaAs MMIC phase shifter elements includes an MMIC device.

4. The modular beamformer of claim 3, wherein each MMIC device includes a plurality of MMIC phase shifters, each one of the MMIC phase shifters coupled to a specific feeder line of the plurality of feeder lines.

5. The modular beamformer of claim 4 wherein a phase length between each corresponding one of the plurality of feeder lines and each corresponding one of the plurality of GaAs MMIC phase shifter elements is substantially equal.

6. The beamformer of claim 1, wherein each one of the plurality of feeder lines comprises a dielectrically loaded waveguide having a circular cross-section.

7. The beamformer of claim 4 further comprising a second plurality of said substantially identical beamformer modules arranged in a second stacked configuration, and wherein the plurality of GaAs MMIC phase shifting elements are disposed in a trapezoidal pattern within each beamformer module of said first and second pluralities, and wherein each beamformer module of both first and second pluralities has first and second substantially parallel opposite sides, and third and fourth opposite sides connected to the first and second sides, the third and fourth opposite sides each comprised of angled segments, the third opposite sides of each beamformer module of said first plurality being interlocked with the fourth opposite sides of each adjacent beamformer module of said second plurality.

8. A modular phased array antenna for the formation of simultaneous independently steerable multiple beams, the modular phased array antenna comprising:

a plurality of sub-array modules combined together in close proximity, each one of the plurality of sub-array modules including,

a plurality of input modules,

a layer of a plurality of radiating antenna elements,

a plurality of beamformer modules arranged in a stacked configuration and each connected to one of the plurality of input modules in beam communication, each one of the plurality of beamformer modules including a plurality of Gallium Arsenide (GaAs) Monolithic Microwave Integrated Circuit (MMIC) phase shifter elements arranged in a primary plane, wherein the plurality of phase shifter elements corresponds to a predetermined number of the plurality of radiating antenna elements, and a waveguide coupler interconnecting each one of the plurality of GaAs MMIC phase shifters to a corresponding one of the plurality of input modules in beam communication; and

a plurality of feeder lines arranged in a secondary plane substantially perpendicular to the primary plane, each one of the plurality of feeder lines coupled to one of the plurality of radiating antenna elements and to one of the plurality of GaAs MMIC phase shifters of each one of the plurality of beamformers, each feeder line comprised of a circular dielectrically loaded waveguide extending through each beamformer of the plurality.

9. The phased array antenna of claim 8, wherein the waveguide coupler defines a pathlength between each one of the plurality of GaAs MMIC phase shifter elements and the corresponding input module, wherein the pathlength between each one of the plurality of GaAs MMIC phase shifters and the input module is substantially equal.

10. The phased array antenna of claim 9, wherein each one of the plurality of GaAs MMIC phase shifter elements includes a GaAs MMIC.

11. The phased array antenna of claim 10, wherein each GaAs MMIC includes a plurality of phase shifters, each phase shifter of the plurality of phase shifters being coupled to one feeder line of the plurality of feeder lines in beam communication.

12. The phased array antenna of claim 10, wherein a phase length between a corresponding one of the plurality of radiating antenna elements and a corresponding one of the plurality of phase shifter elements is substantially equal.

13. The phased array antenna of claim 11, wherein each one of the plurality of feeder lines includes a dielectrically loaded circular waveguide.

14. The phased array antenna of claim 13 further comprising a second plurality of said substantially identical beamformers arranged in a second stacked configuration, and wherein the plurality of GaAs MMIC phase shifting elements are disposed in a trapezoidal pattern within each beamformer of said first and second pluralities, and wherein each beamformer has first and second substantially parallel opposite sides, and third and fourth opposite sides connected to the first and second sides, the third and fourth opposite sides each comprised of angled segments, the third opposite sides of each beamformer of said first plurality being interlocked with the fourth opposite sides of each adjacent beamformer of said second plurality.