Localized Wave Generation Via Model Decomposition of a Pulse by a Wave Launcher

• US 20110018650A1
• Filed: 07/27/2009
• Published: 01/27/2011
• Est. Priority Date: 07/27/2009
• Status: Active Grant

• Current Assignee: New Jersey Institute of Technology
• Original Assignee: New Jersey Institute of Technology
• Inventors: Salem, Mohamed A., Kamel, Aladin Hassan, Niver, Edip
• Granted Patent: US 8,587,490 B2
• Time in Patent Office: Days
• US Class Current: 333/20
• CPC Class Codes: H01P 1/16 for mode selection, e.g. mode suppression or mode promotion; for mode conversion
• CPC Class Codes: H01P 3/00 Waveguides; Transmission lines of the waveguide type
• 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 13/06 Waveguide mouths horns H01Q13/02
• CPC Class Codes: H01Q 19/08 for modifying the radiation pattern of a radiating horn in which it is located corrugated horns H01Q13/0208; producing a circular polarisation H01Q13/0241

Abstract

Implementations for exciting two or more modes via modal decomposition of a pulse by a wave launcher are generally disclosed.

Claims

1. A method for a waveguide to emit two or more modes of propagating waves for observation of a localized wave peak at a predetermined distance from an aperture end of the waveguide, the method comprising:

selecting one or more amplitude and/or phase shift settings based at least in part on the predetermined distance from the aperture end of the waveguide; and

exciting two or more modes via modal decomposition of a pulse in the waveguide, based at least in part on the selected one or more amplitude and/or phase shift settings.

2. The method of claim 1, further comprising determining the predetermined distance to peak prior to selecting the amplitude and/or the phase shift settings.

3. The method of claim 1, further comprising generating the pulse prior to exciting the two or more modes to synthesize a desired aperture field to produce the localized wave peak at the predetermined distance.

4. The method of claim 1, further comprising observing the peak at the predetermined distance based at least in part on a combination of the two or more modes radiated from the aperture end.

5. The method of claim 1, wherein exciting two or more modes comprises exciting two or more antennas in the waveguide, wherein each of the two or more antennas is arranged to emit energy associated with at least one of the modes or superposition of modes of the propagating waves when excited.

6. The method of claim 1, wherein exciting two or more modes comprises adjusting one or more amplitude and/or phase shift of at least one of the modes of the propagating waves with two or more dielectric tuning elements affixed to the waveguide.

7. The method of claim 1, wherein exciting two or more modes comprises exciting two or more modes of the propagating waves with a corrugated section in the waveguide.

8. A wave launcher arranged to emit two or more modes of propagating waves for observation at a predetermined distance from the wave launcher, comprising:

a waveguide including an elongated member and an aperture plane at an end of the waveguide; and

a plurality of antennas, each of the plurality of antennas being positioned within the waveguide at a different distance from the aperture plane and arranged such that each of the plurality of antennas is capable of emitting a different mode or a different superposition of modes of propagating wave from the aperture end of the waveguide when excited.

9. The wave launcher of claim 8, wherein the elongated member of the wave guide comprises a generally tubular shape.

10. The wave launcher of claim 9, wherein the elongated member of the wave guide has a cross-sectional profile that is either round, oval, rectangular, or square.

11. The wave launcher of claim 8, wherein spacing between the plurality of antennas is either uniformly spaced or non-uniformly spaced with respect to one another.

12. The wave launcher of claim 8, the plurality of antennas comprising two or more differently sized antennas.

13. The wave launcher of claim 8, further comprising a power divider that is operably coupled to the plurality of antennas and arranged to divide a pulse among two or more of the plurality of antennas.

14. The wave launcher of claim 13, further comprising a pulse generator that is operably coupled to the power divider and arranged to generate the pulse.

15. The wave launcher of claim 13, wherein the power divider comprises two or more pairs of variable amplitude adjustors and variable phase shifters.

16. The wave launcher of claim 8, further comprising a tuning section located adjacent the aperture plane of the waveguide, the tuning section comprising two or more dielectric tuning elements capable of adjusting amplitude and/or phase shift of at least one of the two or more modes of propagating waves.

17. A wave launcher arranged to emit two or more modes of propagating waves for observation at a predetermined distance from the wave launcher, comprising:

a wave guide including an elongated member with an aperture plane located at an end of the waveguide;

an antenna positioned within the waveguide at a distance from the aperture plane and arranged such that the antenna is capable of emitting electromagnetic energy to the aperture end of the waveguide when excited; and

a step stage section located adjacent the aperture plane of the waveguide, the step stage section comprising two or more dielectric step stage elements capable of exciting two or more modes of propagating waves from the wave launcher in response to the emitted electromagnetic energy from the antenna.

18. The wave launcher of claim 17, wherein the elongated member of the wave guide comprises a generally tubular shape.

19. The wave launcher of claim 17, wherein the two or more dielectric step stage elements are capable of adjusting amplitude and/or phase shift of at least one of the two or more modes of propagating waves.

20. The wave launcher of claim 17, wherein the step stage section comprises a stepped horn shape.

21. A wave launcher arranged to emit two or more modes of propagating waves for observation of a localized wave peak at a predetermined distance from the wave launcher, comprising:

a wave guide including an elongated member with an aperture plane located at an end of the waveguide;

an antenna positioned within the waveguide at a distance from the aperture plane and arranged such that the antenna is capable of emitting electromagnetic energy to the aperture end of the waveguide when excited; and

a corrugated section located within the wave guide, the corrugated section being capable of exciting two or more modes of propagating waves from the wave launcher in response to the emitted electromagnetic energy from the antenna.

22. The wave launcher of claim 21, wherein the elongated member of the wave guide comprises a generally tubular shape.

23. The wave launcher of claim 21, further comprising a tuning section located adjacent an aperture plane end of the wave launcher, the tuning section comprising two or more dielectric tuning elements capable of adjusting amplitude and/or phase shift of at least one of the two or more modes of propagating waves.

24. An article comprising:

a signal bearing medium comprising machine-readable instructions stored thereon, which, if executed by one or more processors, operatively enable a computing device to;

identify a desired distance to observe a peak relative to an aperture plane of a waveguide; and

adjust one or more amplitudes and/phase shift setting based at least in part on the desired distance.

25. The article of claim 24, further comprising enabling a power source to excite the waveguide using the adjusted amplitudes and/or phase shit settings such that one or more propagating modes are excited and observable as a peak at the desired distance.