| 摘要 |
An excitation system for a microwave cooking appliance includes a waveguide along one wall arranged to support a standing wave therein, with an array of apertures spaced along the length of the waveguide to couple energy from the waveguide to the cooking cavity. A phase shifting device periodically shifts the phase of the standing wave between a first phase relationship and a second phase relationship. The array of radiating apertures is configured to support a first and a second substantially stationary radiating pattern when the first and second phase relationships, respectively, are established for the standing wave in the waveguide. Each radiating pattern at the cooking plane has regions of relatively high energy density interspersed wth regions of relatively low energy density, with the high energy regions of one pattern overlying low energy regions of the other, such that by periodically switching between patterns the uniformity of the time-averaged energy density at the cooking plane is enhanced.
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