如何在ADS中自由修改基板？

你能替换这个链接吗？
我无法接受它。
我没有找到手册。
那么你能发送正确的链接吗？
非常感谢



     以下为原文

  Can you replace this link ? I can't acess it. And I did not find the manual. So can you send the correct link please ? Thank you so much

> {quote：title = Aleff001写道：} {quote}>我真的需要修改基板的尺寸，但不能这样做。
Momentum使用一种模拟*无限*基板尺寸的方法 - 堆叠的介电层非常非常大。
这允许使用非常有效和准确的模拟方法。
对于大多数模拟情况，如果包含有限的介电尺寸，则没有区别。
只有少数情况，如电线或天线元件非常整齐到基板边缘，在模拟实际基板尺寸时，结果会有所不同。
FEM *可以*模拟有限的介电尺寸，*但*通常效率较低，需要更多的模拟工作和训练有素的用户才能获得相同的精度水平。
作为EM专家的15年经验：用户在FEM模拟中犯了更多错误，导致结果不准确。
是的，FEM在有限基板尺寸*无关紧要的情况下非常有用 - 但在许多情况下，无限的基板尺寸结果几乎相同，然后我总是更喜欢Momentum而不是FEM。
>我在互联网上找到了三维设计基板的文章。
例如：“基板尺寸：26x45x1 mm”。
当然，这就是他们建造的。
但这并不意味着精确的PCB（26mm x 45mm）尺寸会对结果产生影响。



     以下为原文

  > {quote:title=Aleff001 wrote:}{quote}
> I really need to modify the dimensions of the substrate, but can not do it. 

Momentum uses a method that simulates with *infinite* substrate size - stacked dielectric layers that are very very very large.
This allows to use a simulation method that is very efficient and accurate. For most simulation cases, it makes no difference if you include a finite dielectric size or not. Only few cases, like wires or antenna elements very neat to the substrate edge, will show a difference in results when you simulate the actual substrate size.

FEM *can* simulate finite dielectric size, *but* in general it is less efficient and it requires more simulation effort and well trained users to get the same accuracy level. From 15 years of experience as an EM expert: users make more mistakes with FEM simulation, leading to results that are not very accurate. Yes, FEM is very useful in those cases where finite substrate size *does* matter - but in many cases infinite substrate size results will be almost identical and then I would always prefer Momentum instead of FEM.

>I find articles on the Internet to design substrates with three dimensions. For example: "Substrate Dimensions: 26x45x1 mm". 

Sure, that is what they built. But it does not mean that the exact PCB (26mm x 45mm) size makes a difference in results.

> {quote：title = Aleff001写道：} {quote}> Volker，你能帮我找到这个“FEM”吗？
我发送了ADS布局的打印件，我的布局中没有“Momentum”，为什么？
请帮助我:(“Momentum”和“FEM”是两个可能的EM求解器，请参见截图。两者都需要许可证 - 检查许可证文件中包含哪些EM选项。>我能够定义它是非常重要的。
基板尺寸与构建项目一样。如果您是经验丰富的EM用户，我会接受您的意见。如果您是新用户，您可能会误解基板尺寸的重要性。对于您的贴片天线（？
）它通常不重要。



     以下为原文

  > {quote:title=Aleff001 wrote:}{quote}
> Volker, can  you help me to find this "FEM" ? I send a print of my ADS layout, I don't have "Momentum" in my layout, why ? Please, help me :(

"Momentum" and "FEM" are the two possible EM solvers, see screenshot. Both require a license - check what EM options are included in your license file.

> It is very important to me able to define the dimensions of the substrate as it is for a build project. 

If you are an experienced EM user, I would take your word for it. If you are a new user, you might misunderstand the importance of substrate size. For your patch antenna (?) it is usually not important.

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