Localized wave generation via model decomposition of a pulse by a wave launcher

• US 8,587,490 B2
• Filed: 07/27/2009
• Issued: 11/19/2013
• Est. Priority Date: 07/27/2009
• Status: Expired due to Fees

• Current Assignee: New Jersey Institute of Technology
• Original Assignee: New Jersey Institute of Technology
• Inventors: Niver, Edip, Kamel, Aladin Hassan, Salem, Mohamed
• Primary Examiner(s): Ho, Tan
• Application Number:
  US12/510,040
• Publication Number:
  US 20110018650A1
• Time in Patent Office: 1,576 Days
• Field of Search: 343/762, 343/772, 343/778, 343/786
• US Class Current: 343/762
• 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 wave launcher arranged to emit two or more modes of propagating waves for observation at a predetermined distance from the wave launcher, comprising:

a pulse generator configured to generate a pulse;

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 by the pulse.

2. The wave launcher of claim 1, wherein the elongated member of the wave guide comprises a generally tubular shape.

3. The wave launcher of claim 2, wherein the elongated member of the wave guide has a cross-sectional profile that is either round, oval, rectangular, or square.

4. The wave launcher of claim 1, wherein spacing between the plurality of antennas is either uniformly spaced or non-uniformly spaced with respect to one another.

5. The wave launcher of claim 1, the plurality of antennas comprising two or more differently sized antennas.

6. The wave launcher of claim 1, further comprising a power divider that is operably coupled to the plurality of antennas, operably coupled to the pulse generator, and arranged to divide the pulse among two or more of the plurality of antennas.

7. The wave launcher of claim 6, wherein the power divider comprises two or more sets of variable amplitude adjustors and variable phase shifters.

8. The wave launcher of claim 1, 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.

9. 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 pulse generator configured to generate a pulse;

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 the pulse; 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.

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

11. The wave launcher of claim 9, 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.

12. The wave launcher of claim 9, wherein the step stage section comprises a stepped horn shape.

13. 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 pulse generator configured to generate a pulse;

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 the pulse; 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.

14. The wave launcher of claim 13, wherein the elongated member of the wave guide comprises a generally tubular shape.

15. The wave launcher of claim 13, 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.