Wideband TM.sub.01 -to-TE.sub.11 circular waveguide mode conver

Details Wideband TM.sub.01 -to-TE.sub.11 circular waveguide mode conver Wideband TM.sub.01 -to-TE.sub.11 circular waveguide mode conver

1993-02-08

1995-03-21

Lee, Benny T.

Wave transmission lines and networks

Wave mode converters

315 5, 315 538, H01P 116, H01J 2346

Patent

active

053999991

ABSTRACT:
The mode convertor employs two intermediate modes, a coaxial TEM and a rectangular waveguide TE.sub.10 mode, in the transition between the TM.sub.01 and TE.sub.11 circular waveguide modes. The coaxial line provides isolation while acting as a mode filter between the device input and output ports. The rectangular waveguide provides a wide mode separation ratio between the TE.sub.10 and TM.sub.11 modes. The TE.sub.10 mode then transitions into the TE.sub.11 in the circular output waveguide. The coaxial section keeps the output TE.sub.11 mode from scattering back to the input, and the rectangular section keeps the TM.sub.01 from being excited in the output.

REFERENCES:
patent: 3681714 (1972-08-01), Terakawa
patent: 3942138 (1976-03-01), Schaedla
patent: 4280112 (1981-07-01), Eisenhart
patent: 4282458 (1981-08-01), Barnett
patent: 5030929 (1991-07-01), Moeller
"Development and High-Power Testing of a High Efficiency, Broadband TM.sub.01 -TE.sub.11 Mode Convertor," C. David Cremer et al., Proceedings of the Fifth National Conference on High Power Microwave Technology, 10-15 Jun. 1990, pp. 284-287.
"Design of a single-period 8.6 GHz TM.sub.01 -TM.sub.11 serpentine mode convertor and TM.sub.01 and TE.sub.11 bends in a moderately overmoded circular waveguide," G.H. Luo et al., Digest of the SPIE International Conference on Infrared and Millimeter Waves., Dec. 1990.
"Input Impedance of a Coaxial Line Probe Feeding a Circular Waveguide in the TM.sub.01 Mode," R. H. MacPhie et al., IEEE Tran. Microwave Theory Tech., vol. MTT-38, pp. 334-337, Mar. 1990.

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