Quasi-optical coupler with reduced diffraction

Details Quasi-optical coupler with reduced diffraction Quasi-optical coupler with reduced diffraction

1995-09-20

1997-07-29

Lee, Benny T.

Wave transmission lines and networks

Wave mode converters

315 5, H01P 116, H01J 2354

Patent

active

056525540

ABSTRACT:
A microwave coupler with improved efficiency receives microwave energy in a principal mode TEm,n (m and n being whole numbers and n being not zero) and gives a quasi-optical energy beam. It comprises a mode converter that receives energy in the principal mode and converts a part of it into an auxiliary mode TEp,q (with p and q being whole numbers, q close to one and not zero, p greater than q). The energy in the principal mode and in the auxiliary mode get propagated in a radiator and emerge in the form of the quasi-optical beam by an aperture that coincides with a minimum electrical field resulting from the electrical field of the principal mode and the electrical field of the auxiliary mode. The disclosure has applications notably to the field of gyrotubes.

REFERENCES:
patent: 5187409 (1993-02-01), Ito
patent: 5302962 (1994-04-01), Rebuffi et al.
International Journal of Electronics. vol. 70, No. 5, May 1991, London, GB, pp. 989-1004. M. Otsuka, et al. Development of mode converters for 28GHz electron cyclotron heating system.
Radio Engineering and Electronic Physics. vol. 20, No. 10, Oct. 1975, Washington US pp. 14-17. S.N. Vlasov et al. Transformation of a whispering gallery mode, propagating in a circular waveguide, into a beam of waves.
International Journal of Electronics. vol. 61, No. 6, Dec. 1986, London, GB, pp. 1109-1133. J.L. Doane. Polarization converters for circular waveguide modes.

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