Feed system for microwave oven

Details Feed system for microwave oven Feed system for microwave oven

1980-08-14

1981-11-17

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

219 1055R, H05B 674

Patent

active

043013473

ABSTRACT:
The heating uniformity of a microwave oven is significantly improved by a feed that radiates rotating elliptically polarized electromagnetic waves. A pair of crossed slots in the feed rectangular waveguide has directional characteristics and radiates energy with right-hand and left-hand circular polarization. A variable phase shifter in the waveguide changes the phase of one of the polarizations. Both polarizations interfere in the oven cavity and produce rotating elliptically polarized waves. The circular polarizing element can be a 3-dB hybrid coupler or a turnstile junction.

REFERENCES:
patent: 3210511 (1965-10-01), Smith
patent: 3373259 (1968-03-01), Smith
patent: 3819900 (1974-06-01), Ironfield
patent: 3909754 (1975-09-01), Chapell
patent: 4079221 (1978-03-01), McGillem et al.
patent: 4099042 (1978-07-01), Jean et al.
patent: 4107501 (1978-08-01), Ironfield
patent: 4144436 (1979-03-01), Hauck
patent: 4160144 (1979-03-01), Kashyap et al.
Simmons, A. J., Circularly Polarized Slot Radiators, I.R.E. Trans. on Antennas & Propagation, vol. AP-5, No. 1, Jan. 1957, pp. 31-36.
Helszasn, J., Passive and Active Microwave Circuits, John Wiley & Sons, 1978, p. 43.

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