NIST的科学家们还证明了最精确的光频段综合，通过19位数字的重复可以产生各种特定的颜色。
NIST scientists also have demonstrated the most precise synthesis ever of optical frequencies, generating specific colors with a reproducibility of 19 digits.
在无线通信系统中，光频段与微波以下的射频频段相比，具有传输容量大、不易受到干扰等特殊的优点。
In wireless communication systems, comparing with traditional radio bands, optical bands has the advantage of high transmission capacity and interference resistance.
此处采用在光壁圆锥喇叭内加载一个外形渐变的金属柱体来改变天线的输入阻抗，调节金属柱体的尺寸，包括两端的口径和长度，可以在要求的频段得到理想的输入阻抗。
By modeling the parameters of metal cylinder such as the diameters of both ports and the length of the metal cylinder, the demand input impedance of the conic horn can be obtained.
此处采用在光壁圆锥喇叭内加载一个外形渐变的金属柱体来改变天线的输入阻抗，调节金属柱体的尺寸，包括两端的口径和长度，可以在要求的频段得到理想的输入阻抗。
By modeling the parameters of metal cylinder such as the diameters of both ports and the length of the metal cylinder, the demand input impedance of the conic horn can be obtained.
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