大多数天线被制成碟形，用以收集和反射无线电波至亚反射器，就像曲面镜将可见光聚焦于一点一样。
Most antennas are made in the shape of a dish to collect and reflect the radio waves to the sub reflector, in the same way as a curved mirror focuses visible light to one point.
当你用手覆盖了这个点，天线信号就会衰减。
When covered by your hand, this antenna suffers from attenuation.
这种度量作用可以阻止手指接触到天线的馈点，从而解决阻抗失配的问题。
It's beneficial effect is purely a result of the way it prevents one's finger from touching the antenna's feed point, solving the impedance mismatch issue.
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