将地面层和参考端口添加到相同的布局时结果会降低

> {quote：title = johnny10写道：} {quote}>成员我设计了一个微带贴片天线，我得到的结果约为-27db ....但是当我将地面层和参考端口添加到相同的布局时
结果减少到-13分贝.....任何人都可以帮助我吗？
这可能是地平面尺寸的真实效果，或者它可能是您的模拟设置中的人工制品。
我们不知道，因为我们对您的Momentum模型一无所知。



     以下为原文

  > {quote:title=johnny10 wrote:}{quote}
> members i have designed a microstrip patch antenna and i am getting the results about -27db .... but when i add ground layer and a reference port to the same layout the results get decreased to -13 db ..... can anyone help me out ?

This might be a true effect from ground plane size, or it might be an artefact from your simulation setup. We don't know, because we don't know anything about your Momentum model.

1.sir m2是m1的结果......其余的数字属于有限的地面结构.... 2.当我今天重新设计它时，结果变得更好（我不知道如何......）。
地平面的长度和宽度不同，端口p3也随机放置。
你说这可能是由于地平面的大小......是否有任何数学表达式来决定地平面的大小？
那个港口在地面层的位置怎么样先生？编辑：johnny10于2015年1月17日上午9:56
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     以下为原文

  1.sir m2 is the result of m1.... and rest figures belong to finite ground structure....

2.although when i redesigned it today the results got better ( I don't know how ..).only the ground plane is not of same length and breadth and the port p3 is also placed randomly by me.

And u said it may be due to size of ground plane ... is there any mathematical expression to decide the size of ground plane ? and what about the position of the port on the ground layer sir ?

Edited by: johnny10 on Jan 17, 2015 9:56 AM

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> {quote：title = johnny10写道：} {quote}>和端口p3也是我随机放置的。
随机放置接地引脚是个坏主意。
它确实改变了结果，因为它改变了返回电流的路径。
我会将接地引脚放在信号引脚下面。
要控制接地引脚的大小，可以使用边/区域引脚：http：//muehlhaus.com/support/ads-application-notes/edge-area-pins>你说它可能是由于大小
地平面......是否有任何数学表达式来决定地平面的大小？
先生在地面层的位置怎么样？
对不起，我没有经验法则。



     以下为原文

  > {quote:title=johnny10 wrote:}{quote}
> and the port p3 is also placed randomly by me.

Randomly placing the ground pin is a bad idea. It does change results, because it changes the path for the return current. I would place the ground pin under the signal pin. 

To control the size of the ground pin, you might use an edge/area pin:
http://muehlhaus.com/support/ads-application-notes/edge-area-pins


> And u said it may be due to size of ground plane ... is there any mathematical expression to decide the size of ground plane ? and what about the position of the port on the ground layer sir ?

Sorry, I have no rule of thumb for that.