Increasing the height of the substrate - bad matching

Can anyone explain me why increasing the height of the substrate leads to a worse matching in microstrip antenna after reaching some point of height og the substrate?

No.


There's more to the problem than what you have described. For example, if you change the substrate height without re-designing the antenna, you have detuned it. And also, even if you tune the patch back, it will almost certainly have a different 'tapping point'.


For a good answer, you should supply a more detailed question, i think...