Phase management for beam-forming applications

• US 6,982,670 B2
• Filed: 06/03/2004
• Issued: 01/03/2006
• Est. Priority Date: 06/04/2003
• Status: Expired due to Fees

• Current Assignee: Farrokh Mohamadi
• Original Assignee: Farrokh Mohamadi
• Inventors: Mohamadi, Farrokh
• Primary Examiner(s): PHAN, DAO LINDA
• Application Number:
  US10/860,526
• Publication Number:
  US 20040246176A1
• Time in Patent Office: 579 Days
• Field of Search: 342/154, 342/157, 342/368, 342/372, 342/373
• US Class Current: 342/372
• CPC Class Codes: H01Q 3/22 varying the orientation in accordance with variation of frequency of radiated wave
• CPC Class Codes: H01Q 3/28 varying the amplitude
• CPC Class Codes: H01Q 3/30 varying the relative phase between the radiating elements of an array H01Q3/2605, H01Q3/2658, H01Q3/2682, H01Q3/44 take precedence
• CPC Class Codes: H01Q 3/42 using frequency-mixing H01Q3/2676 takes precedence
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A beam-forming antenna system includes an array of integrated antenna circuits. Each integrated antenna circuit includes an oscillator coupled to an antenna. A network couples to the integrated antenna units to provide phasing information to the oscillators. A controller controls the phasing information provided by the network to the oscillators. In an alternative embodiment, the phasing to each antenna element is controlled through a fixed corporate feed network. The relative gains of the antenna signals received or transmitted through the fixed corporate feed may be adjusted with respect to each other to provide a beam steering capability.

Claims

1. A beam-forming system, comprising

a plurality of integrated antenna circuits, each integrated antenna circuit including a phase-locked loop and a corresponding antenna and mixer, each phase-locked loop operable to receive a reference signal and provide a frequency-shifted output signal that is synchronous with the reference signal, wherein if an integrated antenna circuit is configured for transmission, the output signal is upconverted in the circuit'"'"'s mixer and the upconverted signal transmitted by the corresponding antenna, and wherein if an integrated antenna unit is configured for reception, a received signal from the circuit'"'"'s antenna is downconverted in the mixer responsive to the output signal,

wherein a first integrated antenna circuit in the plurality is configured as a reference antenna circuit such that the reference signal received by the reference antenna unit is a reference clock, the reference antenna circuit including a programmable phase sequencer operable to provide phase-shifted versions of the reference clock, and wherein remaining integrated antenna circuits in the plurality are configured to use selected ones from the phase-shifted versions as their reference signal.

2. The beam forming system of claim 1, wherein the programmable phase sequencer is configured to convert analog voltages into phase delays, the programmable phase sequencer being further configured to form the phase-shifted versions responsive to the phase delays.

3. The beam-forming system of claim 2, wherein the programmable phase sequencer includes a digital word sequencer operable to provide digital words and a digital-to-analog converter operable to convert the digital words into the analog voltages.

4. The beam-forming system of claim 2, wherein the programmable phase sequencer includes a current source operable to charge a capacitor, the programmable phase sequencer being configured to reset a voltage across the capacitor synchronously with cycles of the reference clock.

5. The beam-forming system of claim 4, wherein the programmable phase sequencer includes a comparator operable to compare the analog voltages to the voltage across the capacitor, wherein the assertion of an output signal by the comparator determines the phase delays.

6. The beam-forming system of claim 5, wherein the programmable phase sequencer includes a latch providing an output signal responsive to the assertion of the output signal for the comparator, the output signal of the latch forming the phase-shifted versions of the reference clock.

7. The beam-forming system of claim 1, wherein the remaining integrated antenna circuits in the plurality comprise a slave lead antenna circuit and a slave lag antenna circuit, the programmable phase sequencer operable to provide a lead clock that leads the reference clock by an increment of phase and a lag clock that lags the reference clock by the increment of phase, the lead antenna circuit configured to use the lead clock as its reference signal, the lag antenna circuit configured to use the lag clock as its reference signal.

8. The beam-forming system of claim 1, wherein each antenna is a T-shaped dipole.

9. The beam-forming system of claim 1, wherein each antenna is a patch antenna.

10. A beam-forming system, comprising:

a reference clock source;

a first programmable phase sequencer for providing phase-adjusted versions of a reference clock provided by the reference clock source; and

a first plurality of integrated antenna circuits, each integrated antenna circuit including a phase-locked loop and a corresponding antenna and mixer, each phase-locked loop operable to receive a selected one of the phase-adjusted versions of the reference clock and provide a frequency-shifted output signal that is synchronous with the reference clock, wherein if an integrated antenna circuit is configured for transmission, the output signal is upconverted in the circuit'"'"'s mixer and the upconverted signal transmitted by the corresponding antenna, and wherein if an integrated antenna unit is configured for reception, a received signal from the circuit'"'"'s antenna is downconverted in the mixer responsive to the output signal.

11. The beam-forming system of claim 10, further comprising:

a second programmable phase sequencer for providing phase-shifted versions of a selected one of the phase-shifted versions of the reference clock provided by the first programmable phase sequencer; and

a second plurality of integrated antenna circuits, each integrated antenna circuit in the second plurality including a phase-locked loop and a corresponding antenna and mixer, each phase-locked loop in the second plurality operable to receive a selected one of the phase-adjusted versions from the second programmable phase sequencer, wherein if an integrated antenna circuit in the second plurality is configured for transmission, its output signal is upconverted in the circuit'"'"'s mixer and the upconverted signal transmitted by the corresponding antenna, and wherein if an integrated antenna unit in the second plurality is configured for reception, a received signal from the circuit'"'"'s antenna is downconverted in the mixer responsive to the output signal.

12. The beam forming system of claim 10, wherein the first programmable phase sequencer is configured to convert analog voltages into phase delays, the first programmable phase sequencer being further configured to form the phase-shifted versions responsive to the phase delays.

13. The beam-forming system of claim 12, wherein the first programmable phase sequencer includes a digital word sequencer operable to provide digital words and a digital-to-analog converter operable to convert the digital words into the analog voltages.

14. The beam-forming system of claim 12, wherein the first programmable phase sequencer includes a current source operable to charge a capacitor, the first programmable phase sequencer being configured to reset a voltage across the capacitor synchronously with cycles of the reference clock.

15. The beam-forming system of claim 14, wherein the first programmable phase sequencer includes a comparator operable to compare the analog voltages to the voltage across the capacitor, wherein the assertion of an output signal by the comparator determines the phase delays.

16. A beam-forming system, comprising:

a programmable phase sequencer operable to provide phase-shifted versions of a reference clock, and

a plurality of integrated antenna circuits corresponding to the phase-shifted versions of the reference clock, each integrated antenna circuit including a phase-locked loop and a corresponding antenna and mixer, each phase-locked loop operable to receive the corresponding phase-shifted version of the reference clock as a reference signal and provide a frequency-shifted output signal that is synchronous with the reference signal, wherein if an integrated antenna circuit is configured for transmission, the output signal is upconverted in the circuit'"'"'s mixer and the upconverted signal transmitted by the corresponding antenna, and wherein if an integrated antenna unit is configured for reception, a received signal from the circuit'"'"'s antenna is downconverted in the mixer responsive to the output signal.