| 摘要 |
A microwave oven for heating of foodstuffs including an oven cavity (4) with an opening, a microwave unit for feeding microwaves to the oven cavity, an openable door adapted to close the opening and constituting one of the walls of the cavity, and a microwave seal (6) for reducing the leakage of microwave radiation from the oven cavity when the door is closed. The microwave seal has the form of a groove (12) which surrounds the opening and which is longitudinally divided into a first cavity (7) and a second cavity (8) by a partition (13). When the door is closed, the electric length from the oven cavity to the base of the first cavity is smaller than a quarter of a wavelength, and the electric length from the oven cavity to the base of the second cavity is greater than a quarter of a wavelength, such that two damping peaks are obtained, one on each side of the centre frequency of the microwaves. The position of the damping peaks is determined by projections which are arranged at the top of the partition alternatingly in one and the other direction. |
