Electronically tunable and modulatable quasi-optic grid oscillator

• US 6,538,793 B2
• Filed: 06/05/2001
• Issued: 03/25/2003
• Est. Priority Date: 06/13/2000
• Status: Expired due to Term

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Rosenberg, James J., Deckman, Blythe C., Rutledge, David B.
• Primary Examiner(s): Tokar, Michael
• Assistant Examiner(s): NGUYEN, KHAI M
• Application Number:
  US09/876,211
• Publication Number:
  US 20020018282A1
• Time in Patent Office: 658 Days
• Field of Search: 359/276, 359/278, 359/279, 359/333, 331/155
• US Class Current: 359/276
• CPC Class Codes: H01Q 13/025 Multimode horn antennas; Horns using higher mode of propagation H01Q13/0241 takes precedence; multiple beam H01Q25/04
• CPC Class Codes: H01Q 13/065 provided with a flange or a choke
• CPC Class Codes: H01Q 15/002 said selective devices being reconfigurable or tunable, e.g. using switches or diodes
• CPC Class Codes: H01Q 15/12 functioning also as polarisation filter polarisation converters H01Q15/242
• CPC Class Codes: H01Q 15/24 Polarising devices; Polarisation filters H01Q15/12, H01Q15/22 take precedence
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 3/46 Active lenses or reflecting arrays
• CPC Class Codes: H03F 1/223 with MOSFET's
• CPC Class Codes: H03F 3/1935 with junction-FET devices

Abstract

The present invention discloses an electronically frequency tunable and phase modulatable quasi-optic grid oscillator. The oscillator includes a reference signal input port whereby a small external reference signal is introduced that entrains the frequency and phase of the oscillator signal to it. Amplitude modulation techniques are introduced to further enhance the utility of the oscillator as a modulator.

Claims

1. An electronically tunable and modulatable quasi-optic power signal source, comprising:

(a) a quasi-optic grid oscillator that includes (i) a grid array amplifier having an input and output, (ii) a twist reflector spaced apart from the amplifier by a predetermined distance, and (iii) an oscillator output that sources an output signal; and

(b) means for introducing a signal to entrain the frequency and phase of the oscillator output to a reference signal having a frequency and phase that are specified as a function of time, such that the oscillator output bears a predetermined relationship to the frequency and phase of the reference signal.

2. The power signal source of claim 1, wherein the means for entraining is an input port associated with the oscillator that accepts an external injection-locking reference signal having a frequency and phase that are specified as a function of time.

3. The power signal source of claim 2, wherein the input port is located at the twist reflector.

4. The power signal source of claim 3, wherein the twist reflector includes a mirror and an angled polarizer associated with the mirror and the input port is located within the mirror of the twist reflector.

5. The power signal source of claim 2, wherein the input port is located at the input of the grid amplifier.

6. The power signal source of claim 2, wherein the input port is located at the output of the grid amplifier.

7. The power signal source of claim 2, wherein the input port is located at the output of the oscillator.

8. The source of claim 1, wherein the output of the oscillator tracks the frequency and phase of the reference signal in a one to one relationship.

9. The source of claim 1, wherein the frequency and phase of the oscillator'"'"'s output is a multiple of the frequency and phase of the reference signal.

10. An electronically tunable and modulatable quasi-optic power signal source, comprising:

(a) a quasi-optic grid oscillator including a grid array amplifier, a polarizing feedback structure and an output that sources an output signal; and

(b) a reference input port associated with the oscillator that accepts an external injection-locking reference signal having a frequency and phase that are specified as a function of time such that the oscillator output bears a predetermined relationship to the frequency and phase of the reference signal.

11. An electronically tunable and modulatable power signal source, comprising:

(a) a quasi-optic grid oscillator having an output that sources an output signal;

(b) a reference input port associated with the oscillator that accepts an external injection-locking reference signal having a frequency and phase that are specified as a function of time such that the oscillator output bears a predetermined relationship to the frequency and phase of the reference signal; and

(c) a controller that regulates the amplitude of the output signal of the oscillator.

12. The signal source of claim 11, wherein the controller is an external voltage modulator connected to the oscillator that directly modulates of the control bias voltage of the oscillator.

13. A system for electronically tuning and modulating a power signal source, comprising:

(a) a first quasi-optic grid oscillator having an first output that sources a first output signal;

(b) a second quasi-optic grid oscillator having an second output that sources a second output signal that is summed with the first output; and

(c) an outphasing modulation control unit that supplies the first and second grid oscillators with a first and second phase-modulated reference signal, respectively, such that the phasor sum of the oscillators outputs a desired phase and amplitude modulated signal.

14. The system of claim 13, wherein the outputs of the two oscillators are summed in free-space.

15. The system of claim 13, wherein the outputs of the two oscillators are summed using guided-wave power combining.

16. The array of claim 13, wherein the amplitude of the first oscillator output is directly modulated with a first external voltage modulator and the amplitude of the second oscillator output is directly modulated with a second external voltage modulator.

17. A method of electronically tuning and modulating a quasi-optic grid oscillator having a signal output, including:

applying a reference signal to the oscillator; and

adjusting the reference signal to a desired frequency and phase such that the oscillator output is entrained to the frequency and phase of the reference signal.