Attempt of Cost-down of Antenna Panel for Receiving Shorter Mill imeter Waves - Towards Observing Black Hole Horizon

为了实现接收短毫米波的高精度天线面板的低成本，我们对金属旋转法天线的表面精度进行了检测。用现有的模具，我们可以很容易地达到S 60微米的表面精度。结果发现，模具的表面精度主要取决于模具的精度。如果我们能在金属旋压中使用更高精度的模具，天线表面就会变得越精确。表面精度将达到和R.M.S.一样高。30微米的水平，如果我们使用这样一个新的模具。金属旋转天线的表面精度在我们研究的2年内保持不变。由于金属旋转天线很薄，表面很容易受到非均匀加力而变形。在实际使用中，天线表面的支撑结构对保持表面的高精度非常重要。

In order to realize the cost-down in making a high precision antenna panel for receiving shorter millimeter wave, we examined the accuracy of the surface of antennas made by metal spinning method. Using an existing mold we could attain a surface accuracy as well as 60 micron r. m. s. easily. As the results, we found that the surface accuracy depends mainly on the accuracy of the mold. If we can use a higher precision mold in metal spinning, the more accurate the antenna surface will become. The surface accuracy will reach as well as r.m.s. 30 micron level if we use such a new mold. The surface accuracy of the metal spinning antenna maintained within the 2 years of our research period. Because the metal spinning antenna is very thin, the surface can be deformed easily by adding force non-uniformly. In practical use, a supporting structure of the antenna surface is very important to maintain the high accuracy of the surface.