| 摘要 |
PURPOSE:To improve the characteristic by selecting the width of the opening side of a corrugated slot wider than the width at the depth so as to decrease number of stages thereby suppressing the impedance of pass band even when the difference between the pass band and the band of the element is small. CONSTITUTION:An impedance matching part 2 is formed across the rectangular waveguide 1 and plural corrugate slots 3 are formed to the H plane of the waveguide at the middle part. A step is formed on the way of the corrugated slot 3 in the direction of the depth thereby making the width B1 of the slot opening side wider than the width B2 at the depth. Thus, the impedance at a frequency fp of the pass band is kept small and the frequency finfinity giving infinite impedance infinity is approached to the frequency fR of the block band and a comparatively large attenuation is obtained with less number of stages without deteriorating the electric characteristic of the pass band.
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