帮助CPW补丁天线端口设置

这里出了点问题，自适应扫描不能很好地收敛。
与往常一样，最好上传已存档的工作区，以便其他用户可以查看并尝试重现或解决问题。
如果没有工作空间，这里有一些问题：为什么要将中心导体引脚P1的大小限制在该导体的中间？
CPW模式的电流到达边缘，所以我希望（+）端口必须跨越整个中心cenductor。
（ - ）端口看起来不错。
此外，对于天线功能，我预计需要一定的地面尺寸。
你确定这么短/小的馈线足够吗？



     以下为原文

  Something goes wrong here, and the adaptive sweep does not converge well.

As always, it would be best to upload the archived workspace, so that other users can have a look and try to reproduce or solve the problem. 

Without having your workspace, here are questions: Why did you limit the size of the center conductor pin P1 to the middle of that conductor? The current for the CPW mode goes to the edges, so I would expect that the (+) port must be across the entire center cenductor. The (-) ports look ok to me.

Also, for the antenna function I would expect that a certain ground size is needed. Are you sure that it's enough to have such short/small pieces of feedline?

Volker，非常感谢你的回复。
我已经附上了工作区。
我不得不重新创建它，因为我无法找到原始的。
但它仍有同样的问题。
现在提出您的问题：*为什么要将中心导体引脚P1的尺寸限制在该导体的中间？
我这样做是为了让它更逼真。
就像我说的那样，我对此非常陌生。
关于如何为具有CPW的简单平面天线安排端口似乎没有明确的例子。
我使用的原始示例没有使用CPW，因此他们能够使用简单的单个端口。
*您确定这么短/小的馈线足够吗？
我的部分工作涉及尺寸的参数研究。
我必须用低导电率的薄膜材料设计和模拟天线。
参数研究对于理解天线的行为至关重要。
因此，地面的大小可能会改变，而不是优化。
但是当我不知道端口是否设置正确时，如果端口太小或太大，它实际上没有任何区别。
我可能需要遵守的重要设计参数之一是传输线的尺寸，这也部分地决定了CPW的尺寸。
由于我需要50欧姆的传输线，我必须相应地调整尺寸。
这就是为什么我有短而宽的传输线。
您认为宽的传输线可能需要设置不同的样式端口吗？
我记得读过很宽的传输线很难模拟。



     以下为原文

  Volker,

Thanks a lot for the reply.

I have attached the workspace. I had to recreate it since I wasn't able to find the original one. But it has the same problems nevertheless.

Now for your questions:

*Why did you limit the size of the center conductor pin P1 to the middle of that conductor?
I did it to make it physically more realistic. Like I have said, I am very new at this. There doesn't seem to be a clear example around on how to arrange ports for a simple planar antenna with CPW. The original example I used didn't use CPW so they were able to get away with a simple single port.

*Are you sure that it's enough to have such short/small pieces of feedline?
Part of my work involves parametric study of the dimensions. I have to design and simulate the antenna with a low conductivity thin film material. And parametric study is crucial to understand how the antenna behaves. So, the size of the ground may change, it is not optimized. But when I don't know if ports are set up correctly, it doesn't really make any difference if its too small or too large.

One of the important design parameters that I may need to adhere to is the dimensions of the transmission line, which also partially dictates the dimensions of the CPW. Since I need a 50 Ohm transmission line, I have to adjust dimensions accordingly. That is why I have short and wide transmission line. 

Do you think a wide transmission line may require a different style port set up? I remember reading that wide transmission lines can be hard to simulate.

附件

• AntennaProto1_wrk.zip218.6 KB
  

嗨，是的，来自求解器的这些消息警告电气端口大小。
应该是*为什么要将中心导体引脚P1的大小限制在该导体的中间？
>我这样做是为了让它更逼真。
就像我说的那样，我对此非常陌生。
关于如何为具有CPW的简单平面天线安排端口似乎没有明确的例子。
我使用的原始示例没有使用CPW，因此他们能够使用简单的单个端口。
如果您正在建模仅接触中心导体中间的物理连接，那么您的方法就可以了。
否则，我会认为整个中心导体的端口更加逼真。
我检查了你的模型的差异，两者在高达7GHz的良好协议。
所以这并不重要。
对于地面港口，我完全同意你所绘制的。
无需改变。
> *您确定这么短/小的馈线足够吗？
>我的部分工作涉及尺寸的参数研究。
我必须用低导电率的薄膜材料设计和模拟天线。
参数研究对于理解天线的行为至关重要。
因此，地面的大小可能会改变，而不是优化。
我以为天线需要一些地面平衡才能表现良好。
与补丁本身相比，目前的基础相当小。
小地面会改变天线的辐射。
您的模型是一项有趣的模拟任务，因为石墨烯导体是如此有损耗（16.7欧姆/平方）。
这意味着任何额外长度的线路都是有损耗的，如果它不是实际硬件的一部分，则需要小心去嵌入。
并且因为我们无法在接地导体的整个宽度上进行馈电，所以使用额外馈电长度的简单参考偏移也会引起问题。
非常有趣和具有挑战性，但它看起来非常简单。
>我可能需要遵守的一个重要设计参数是传输线的尺寸，这也部分决定了CPW的尺寸。
由于我需要50欧姆的传输线，我必须相应地调整尺寸。
这就是为什么我有短而宽的传输线。
您可以使用更小（更薄）的线和更小的间隙来做50欧姆，但是​​使用非常有损的导体，我可以看到这是不可取的，>您认为宽的传输线可能需要设置不同的样式端口吗？
我记得读过很宽的传输线很难模拟。
是的，但你已经注意到了这一点。
将接地引脚放置在间隙附近，并使用边缘/区域引脚限制其尺寸的基本思路是好的并且建议使用。
做得好。



     以下为原文

  Hi,

Yes, there are these messages from the solver that warn about the electrical port size. It should be *Why did you limit the size of the center conductor pin P1 to the middle of that conductor?
> I did it to make it physically more realistic. Like I have said, I am very new at this. There doesn't seem to be a clear example around on how to arrange ports for a simple planar antenna with CPW. The original example I used didn't use CPW so they were able to get away with a simple single port.

If you are modelling a physical connection that touches only at the middle of the center conductor, then your approach is fine. Otherwise, I would consider the port across the entire with of the center conductor more realistic. I checked the difference to your model, and both where in good agreement up to 7GHz. So this isn't critical.

For the ground ports, I fully agree with what you have drawn. No need for change.

> *Are you sure that it's enough to have such short/small pieces of feedline?
> Part of my work involves parametric study of the dimensions. I have to design and simulate the antenna with a low conductivity thin film material. And parametric study is crucial to understand how the antenna behaves. So, the size of the ground may change, it is not optimized. 

I was thinking that the antenna needs some ground counterpoise to perform well. The present ground is rather small, compared to the patch itself. Small grounds will change the antennas radiation.

Your model is an interesting simulation task, because the graphene conductor is so lossy (16.7 Ohm/square). This means that any extra length of line is really lossy, and needs to be de-embedded with care if it is not part of the actual hardware. And because we can't feed across the entire width of the ground conductors, using simple reference shift in extra feedlength will cause issues as well. Really interesting and challenging, althought it looks so very simple. 

> One of the important design parameters that I may need to adhere to is the dimensions of the transmission line, which also partially dictates the dimensions of the CPW. Since I need a 50 Ohm transmission line, I have to adjust dimensions accordingly. That is why I have short and wide transmission line. 

You could do 50 Ohm with smaller (thinner) lines and smaller gaps, but with your very lossy conductor, I can see that's not desirable,

> Do you think a wide transmission line may require a different style port set up? I remember reading that wide transmission lines can be hard to simulate.

Yes, but you have already payed attention to that. The basic idea of placing the ground pins near the gap, and limit their size with an edge/area pin, is good and recommended. Well done.