Wave transmission lines and networks – Wave mode converters
Patent
1989-07-17
1990-09-11
Healy, Brian
Wave transmission lines and networks
Wave mode converters
333241, 333242, H01P 116, H01P 300, H01P 314
Patent
active
049566202
ABSTRACT:
A waveguide mode converter converts electromagnetic power being transmitted in a TE.sub.0n or a TM.sub.0n mode, where n is an integer, to an HE.sub.11 mode. The conversion process occurs in a single stage without requiring the power to pass through any intermediate modes. The converter comprises a length of circular corrugated waveguide formed in a multiperiod periodic curve. The period of the curve is selected to couple the desired modes and decouple undesired modes. The corrugation depth is selected to control the phase propagation constant, or wavenumbers, of the input and output modes, thereby preventing coherent coupling to competing modes. In one embodiment, both the period and amplitude of the curve may be selectively adjusted, thereby allowing the converter to be tuned to maximize the conversion efficiency.
REFERENCES:
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patent: 4429290 (1984-01-01), Devan
patent: 4482899 (1984-11-01), Dragone
patent: 4680558 (1987-07-01), Ghosh et al.
Moeller, "Mode Converters Used in the Doublet III ECH Microwave System," Int. J. Electronics, vol. 53, No. 6, pp. 587-593 (1982).
Dragone, "Reflection, Transmission, and Mode Conversion in a Corrugated Feed," The Bell System Technical Journal, vol. 56, No. 6, pp. 835-867 (Jul.-Aug. 1977).
Buckley et al., "New Compact Quasi-Periodic and Aperiodic Mode Converters for 60 and 140 GHz Gyrotrons," Twelfth Int'l Conf. on Infrared and Millimeter Waves, Dec. 14-18, 1987, Lake Buena Vista, Fla.
Two pages from the Electronics Designer's Handbook, Second Edition, pp. 8-36, 8-37 (McGraw Hill 1977).
Doane, "Propagation and Mode Coupling in Corrugated and Smooth-Wall Circular Wavegiudes," Infrared and Millimeter Waves, vol. 13, chapter 5, pp. 123-170 (Academic Press 1985).
Doane, "Mode Converters for Generating the HE 11 (Gaussian-Like) Mode Form TE 01 in a Circular Waveguide," Int. J. Electronics, vol. 53, No. 6, pp. 573-585 (1982).
Healy Brian
The United States of America as represented by the United States
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