Electric heating – Metal heating – Of cylinders
Patent
1985-03-06
1986-04-01
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055R, 343700MS, 343756, H05B 672
Patent
active
045800235
ABSTRACT:
A circularly polarized microwave oven. Microwave energy is coupled from a waveguide above the ceiling to the cavity by a rotatable vertical probe. A strip transmission line closely spaced to the ceiling to limit radiation therefrom conducts the microwave current from the probe to a helical strip antenna radially offset from the axis of the probe. The helical strip antenna has a cylindrical segment which has a downward slope from its feed end to gradually increase the spacing between the cylindrical segment and the ceiling which functions as a ground plane. The increase in radiative efficiency around the cylindrical segment caused by increasing the spacing to the ceiling offsets the magnitude of the current traveling wave diminishing as a result of radiation losses. Accordingly, the magnitude of the X and Y electric vectors are substantially equal over a relatively wide angle thus defining circular polarization. Connected to the opposite end of the cylindrical segment is a flat or horizontal segment of the helical antenna. Rotation of the probe about its axis moves the helical antenna in a horizontal circular path thus further enhancing the heating uniformity.
REFERENCES:
patent: 2480682 (1949-08-01), Stiefel
patent: 3210511 (1965-10-01), Smith
patent: 3493709 (1970-02-01), Lavoo et al.
patent: 4324968 (1982-04-01), Smith
patent: 4335289 (1982-06-01), Smith
patent: 4336434 (1982-06-01), Miller
patent: 4414453 (1983-11-01), Simpson
patent: 4496814 (1985-01-01), Fitzmayer
patent: 4508946 (1985-04-01), Yoshimura et al.
Amana Refrigeration Inc.
Clark William R.
Leung Philip H.
Sharkansky Richard M.
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