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李凯生

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[问答]

如何创建启动SMA工具包?

我想为家用E8358A创建一个SMA校准套件,最高可达9 GHz。
我有一个漂亮的3.5mm SOLT和TRL套件在工作,因此我可以用3.5mm参考平面直接测量SMA标准,然后拟合系数。
然而,由于参考平面不连续,这是徒劳的吗?
没有商业SMA偏移打开和短路,并且由于额外的不连续性而采用插孔保护器来实现偏移似乎是不明智的。
由于3.5mm是为实验室级SMA测量而创建的,因此直接测量可能不会那么糟糕。
SMA-SMA接口实际上可能比3.5mm-SMA接口差。
是否可以使用未经校正的VNA测量“自举”套件?
有一段时间我通过将汞注入连接器(是的,听起来很疯狂)来创建零偏移短路,以获得相位参考,然后计划连接SMA短路以测量延迟。
然而,当我发现水银确实紧贴黄金时,这真是一团糟,所以我停了下来。
我意识到SMA套件是不受欢迎的,但惠普实际上曾经制造过它们,因为我有一个节拍(我从垃圾箱中救出)来证明这一点。
我应该提到我在eBay上找到了一个Maury女性SMA滑动负载。
我从来不知道他们做了这样的事情,但那应该照顾> 2GHz终止。
也许这将更多地是关于如何创建一个校准套件的练习。
我有几个3.5毫米的航空公司进行验证。
编辑:MADENGR于2013年6月21日下午4:13编辑:MADENGR于2013年6月21日下午4:48编辑:MADENGR于2013年6月21日下午4:50

以上来自于谷歌翻译


     以下为原文

  I'd like to create an SMA cal kit for my home E8358A for use up to 9 GHz.  I have a nice 3.5mm SOLT and TRL kit at work, thus I could directly measure the SMA standards with 3.5mm reference planes, then fit the coefficients.  However is this futile due to the reference plane discontinuity?  There are no commercial SMA offset opens and shorts, and taking on jack savers to achieved the offset seems unwise due to additional discontinuities.  Since 3.5mm was created for laboratory grade SMA measurements, maybe a direct measurement won't be so bad.  SMA-SMA interface may actually be worse than 3.5mm-SMA interface.

Would "bootstrapping" a kit using an un-corrected VNA measurement be possible?  At one time I created zero offset shorts by pouring mercury into connectors (yes, sounds crazy), to get a phase reference, then planned on connecting the SMA short to measure the delay.  However it was a real mess as I found out mercury really clings to gold, so I stopped.

I realize SMA kits are frowned upon, however at one time HP actually made them as I have a beat up one (I rescued from the trash) to prove it.

I should mention I have a Maury female SMA sliding load I found on eBay.  I never knew they made such a thing, but that should take care of the > 2GHz termination.

Maybe this will be more of an exercise on how good of a cal kit can be created.  I have several 3.5mm airlines for verification.

Edited by: MADENGR on Jun 21, 2013 4:13 PM

Edited by: MADENGR on Jun 21, 2013 4:48 PM

Edited by: MADENGR on Jun 21, 2013 4:50 PM  

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黎菁菁

2019-8-12 08:06:15
Roger Pollard的论文“补偿技术改进了一系列机械兼容连接器的测量”,Microwave Journal 1994年10月提供了一些关于SMA到3.5mm连接阻抗不连续性及其对测量误差的影响的见解。
还提出了补偿模式。


以上来自于谷歌翻译


     以下为原文

  Roger Pollard's paper "Compensation Technique Improves Measurements for a Range of Mechanically Compatible Connectors", Microwave Journal Oct. 1994 provide some insight in SMA to 3.5mm connection impedance discontinuity and its impact on measurement errors.  A compensation model was also presneted.

Ken
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李凯生

2019-8-12 08:16:08
引用: 60user22 发表于 2019-8-12 08:06
Roger Pollard的论文“补偿技术改进了一系列机械兼容连接器的测量”,Microwave Journal 1994年10月提供了一些关于SMA到3.5mm连接阻抗不连续性及其对测量误差的影响的见解。
还提出了补偿模式。

谢谢,好好阅读。
我将在3.5mm端口上测量SMA标准并去嵌入他的模型。
这应该提供SMA响应。
然而,考虑到SMA挫折的可变性,可能是徒劳的。

以上来自于谷歌翻译


     以下为原文

  Thanks, good read.  I'll measure the SMA standards on 3.5mm ports and de-embed his model.  That should provide the SMA response.  However given the variability in the SMA setback, could be a futile exercise.
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