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嗨，我正在制作一个同轴TRL校准套件。
我阅读了安捷伦应用说明PN 8720-2（使用TRL *校准的夹具内微带设备测量），其中提到了*反射系数的相位必须已知且指定在±1/4波长或±90°范围内。 我将使用零通过意味着他们男性和女性参考平面将相互接触以通过。 我也会用短片做反射。 这是否意味着反射/短平面必须非常接近，或者在我要校准的参考平面的1/8拉姆距离内？ 谢谢。 以上来自于谷歌翻译 以下为原文 hi i'm making a coax TRL calibration kit. i read Agilent application note PN 8720-2 (In-fixture Microstrip Device Measurements Using TRL* Calibration) where it mentions, * Phase of reflection coefficient must known and specified to within ± 1/4 wavelength or ± 90°. i'm going to use zero thru meaning they male and female reference plane will touch each other to make the thru. also i will use short to make the Reflect. does this mean that the Reflect/ short plane has to be very close, or within 1/8 lamda distance to the reference plance that i'm going to calibrate? thanks. 附件
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6个回答
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一般来说，是的，这是最简单的方法。
通常开放是一个很好的选择，除非辐射导致问题。 以上来自于谷歌翻译 以下为原文 In general, yes, that is the simplest way. Often an open is a good choice, unless radiation causes a problem. |
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我想为同轴TRL校准套件，Short更好，不是吗？ 这是因为它对边缘影响较小。 这是正确的理解吗？ 以上来自于谷歌翻译 以下为原文 I thought for coax TRL calibration kit, Short is better, isn't it? This is because it has less fringing impact. is this the correct understanding? |
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实际上，TRL中的边缘电容根本不重要，只要它在端口1和端口2上是相同的。但是这假设它们没有辐射（如果两个端口上的绝对恒定，则辐射无关紧要） 。 但是对于PCB标准，开放通常在感兴趣的频带中辐射，并且相邻结构导致端口1和端口2的辐射不同，因此在这种情况下，短路更好。 以上来自于谷歌翻译 以下为原文 In fact, the fringing capacitance in TRL doesn't matter at all, provided it is identical on port 1 and port 2. But that presumes their is no radiation (which radiation doesn't matter either if it is absolutely constant on both ports). But for PCB standards, the open often radiates in the band of interest and adjacent structures cause the radiation to be different for port 1 and port 2, and so in such cases a short is better. |
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脑洞大赛9 发表于 2018-12-28 17:41 所以对我来说，只要两个端口看到相同的边缘电容和相同的辐射，通过使用open作为Reflect就不会有任何影响。 这是正确的理解吗？ 以上来自于谷歌翻译 以下为原文 so it sounds to me that as long as the two ports seeing the same fringing capacitance and the same radiation, it would affect nothing by using open as the Reflect. is this the correct understanding? |
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TRL校准的反射标准有两个要求。
1）端口1和端口2反映标准相同。 2）反射标准的相位需要在每个频率点的+/- 90度内知道。 这意味着反射标准的偏移延迟值需要在最高频率点的1/4波精度内定义。 如果你可以在参考平面上制造短路，你的延迟是零，应该可以正常工作。 否则，您需要对延迟值进行良好估计，延迟值是参考平面与短路位置之间的偏移长度的函数。 打开的电容会导致相位随频率的变化而变化，必须适当考虑。 辐射或耦合到另一个端口是额外的问题。 以上来自于谷歌翻译 以下为原文 There are two requirements for the reflect standard for TRL calibration. 1) Port 1 and Port 2 reflect standards are equal. 2) The phase of the reflect standards need to be known within +/- 90 degrees at every frequency point. That implies that the offset delay value of the reflect standards needs to be defined within a 1/4 wave accuracy at the highlest frequency point. If you can fabricate shorts right at the reference planes, your delay is zero and should work ok. Otherwise, you need a good estimate of the delay value, a function of the offset length between your reference planes and the location of the shorts. Fringing capacitance of the the open can cause phase to change as a function of frequency and must be accounted for properly. Radiation or coupling to the other port are addtional concerns. |
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谢谢。 你是什么意思，_否则，你需要一个很好的延迟值估计，一个函数的参考平面之间的偏移长度和shorts._的位置的同轴电缆，有时很难在参考时做短 平面。 当你说参考平面和短路的偏差之间的偏移长度的函数时，你有一个考试吗？ 所以我知道如何实现这一点。 以上来自于谷歌翻译 以下为原文 thanks. what do you mean by, _Otherwise, you need a good estimate of the delay value, a function of the offset length between your reference planes and the location of the shorts._ for coax, sometimes it is difficult to make the short at the reference plane. when you say a function of the offset length between the refernce plane and the loacation of the short, do you have an examle? so i know how to implement this. |
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