Wave transmission lines and networks – Wave mode converters
Patent
1997-01-18
1999-08-24
Pascal, Robert
Wave transmission lines and networks
Wave mode converters
333248, H01P 116
Patent
active
059429569
ABSTRACT:
A method for designing an aperiodic grating structure for mode conversion and control which is based upon an inverse scattering optimization procedure. In accordance with this method, no predetermined shape or material variation of the grating structure is assumed. A constrained domain of all surfaces and material variations is searched to find an optimum aperiodic conversion surface profile for maximum conversion efficiency into the required output mode(s) or optimum control. Accordingly, the present method results in the design of rough surfaces or non-homogeneous structures for mode conversion and control. Because this method relies on scattering produced by short, forceful field perturbations, it is possible to achieve very small conversion lengths which are much less than one grating period. For microwave frequencies this method can be used to design mode converters, mode filters, frequency filters, phase shifters, mode launchers, waveguide transitions and adapters, power splitters, phase shifters, couplers, etc. Optical applications of this method include and are not limited to the design of waveguide transitions and couplers, mode converters, aperiodic gratings, aperiodic Bragg reflectors, narrowband filters, holographic elements, etc. In all these cases the propagation medium may be a waveguide of any shape, material and size, or it could be free space. Efficiencies close to the theoretical maximums are obtainable with this method.
REFERENCES:
patent: 3678420 (1972-07-01), Alsberg
patent: 3771078 (1973-11-01), Kidner et al.
patent: 3812578 (1974-05-01), Prinzhorn
patent: 4268804 (1981-05-01), Spinner et al.
patent: 4510469 (1985-04-01), Bowman
patent: 4636689 (1987-01-01), Mourier
patent: 4999591 (1991-03-01), Koslover et al.
patent: 5015914 (1991-05-01), Ives et al.
patent: 5030929 (1991-07-01), Moeller
patent: 5266962 (1993-11-01), Mobius et al.
patent: 5302962 (1994-04-01), Rebuffi et al.
Huang, et al. "Computer-Aided Design and Optimization of NRD-Guide Mode Suppressors," IEEE Transactions on Microwave Theory and Techniques, vol. 44, No. 6, Jun. 1, 1996, pp. 905-910.
Haq et al., "Aperiodic Grating for TE.sub.02 to TE.sub.01 Conversion in a Highly Overmoded Circular Waveguide", Mar. 14-15, 1995, Digest of OSA Topical Meeting on Signal Recovery & Synthesis, pp. 31-33.
Haq et al., "TE.sub.11 to TM.sub.11 Compact Mode Converter for Circular Waveguide", 1995, I.E.E.E. Microwave Theory and Techniques Symposium.
Haq et al., "Aperiodic Gratings in Waveguides", Jun. 6-8, 1994, Optical Society of America Topical Meeting on Diffractive Optics: Design, Fabrication, and Applications, Technical Digest Series, vol. 11, pp. 198-201.
Haq et al., "Scattering Optimization Synthesis of Compact Mode Converters for Waveguides", Jun. 19-24, 1994, I.E.E.E. Antennas and Propagation International Symposium Digest, pp. 1668-1671.
Haq et al., "Scattering Optimization Method for the Design of Compact Mode Converters for Waveguides", Mar., 1995, I.E.E.E. Transactions on Microwave Theory and Techniques, vol. 43, No. 3, pp. 559-565.
Haq et al., "Application of the Scattering Optimization Method for the Design of Circular Waveguide Mode Converters", Jun. 18-23, 1995, I.E.E.E. Antennas and Propagation International Symposium, pp. 718-721.
Haq et al., "Aperiodic Grating Structure for TE.sub.11 to TM.sub.11 Mode Conversion", Optical Engineering Midwest, R.P. Guzik, ed., Proc. S.P.I.E. vol. 2622 (1995), pp. 207-214.
Haq et al., "Synthesis of waveguide mode control devices based on aperiodic gratings", J. Opt. Soc. Am. A, vol. 13, No. 7 (Jul., 1996), pp. 1501-1505.
Haq et al., "Compact Circular Waveguide Mode Converters", Microwave and Optical Technology Letters, vol. 13, No. 5 (Dec. 5, 1996), pp. 251-255.
Haq, "Design and fabrication of compact waveguide mode control devices", Ph.D. dissertation (Purdue University, West Lafayette, Indiana, Aug., 1995).
Buckley et al., "Compact Quasi-Periodic and Aperiodic TE.sub.0n Mode Converters in Overmoded Circular Waveguides for use with Gyrotrons", I.E.E.E. Transactions on Microwave Theory and Techniques, vol. 38, No. 6 (Jun., 1990), pp. 712-721.
Buckley et al., "A Single-Period TE.sub.02 -TE.sub.01 Mode Converter in a Highly Overmoded Circular Waveguide", I.E.E.E. Transactions on Microwave Theory and Techniques, vol. 39, No. 8 (Aug., 1991), pp. 1301-1306.
Kumric et al., "Optimization of Mode Converters for Generating the Fundamental TE.sub.01 Mode from TE.sub.06 Gyrotron Output at 140 GHz," International Journal of Electronics, vol. 64, No. 1 (Jan., 1988), pp. 77-94.
Marcuse, "Mode Conversion Caused by Surface Imperfections of a Dielectric Slab Waveguide," Bell Systems Technical Journal (Dec., 1969), pp. 3187-3215.
Carin et al., "Matched Windows in Circular Waveguides", I.E.E.E. Transactions on Microwave Theory and Techniques, vol. 36, No. 9 (Sep., 1988), pp. 1359-1362.
Tate, et al., "Experimental Proof-of-Principal Results on a Mode-Selective Input Coupler for Gyrotron Applications", I.E.E.E. Transactions on Microwave Theory and Techniques, vol. 42, No. 10 (Oct., 1994), pp. 1910-1917.
W. A. Huting et al., "Numerical Solution of the Continuous Waveguide Transition Problem," I.E.E.E. Transactions on Microwave Theory and Techniques, vol. 37, No. 11 (Nov. 1989), pp. 1802-1807.
B. Lichtenberg et al., "Finite element simulation of wavelength scale optical elements", Optical Engineering Midwest, R.P. Guzik, ed., Proc. S.P.I.E. vol. 2622 (1995), pp. 196-206.
Gallagher Neal C.
Haq Tanveer U.
Webb Kevin J.
Bettendorf Justin P.
Pascal Robert
Purdue Research Foundation
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