| 摘要 |
PURPOSE:To obtain a required frequency region by adopting the structure that the bottom of each corrugated slot is formed stepwise in the axial direction of the horn or tilted in a converse way in the axial direction of the horn so as not too adopt the ring loading but to adopt various shapes to the slot bottom. CONSTITUTION:The bottom 71 of the slot 81 is processed stepwise, that is, the depth of each step is different. The depth of the shallower tread at the 1st flight is D1, the width of the flight is B1, and the depth of the 2nd flight is D2 and the width is B2. In selecting the dimensions D1, D2, B1, B2, T, H properly, the admittance frequency characteristic is changed and it is possible to widen or shift the frequency region at which the excellent radiation performance is obtained. When the bottom of the corrugated slot is formed with three flights or over, or even when the tread between flights is not in parallel with each other, or the bottom of the corrugated slit is tapered, the similar effect is obtained. Even when the shape of the corrugate is optional, for example, a ring is loaded at the inlet of the slot, the operating frequency band is changed.
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