GIGER
Junior Member level 1

Hello guys!
I have a problem. I'm designing a patch antenna array. I'm feeding the antenna with a microstrip line with a characteristic impedance of 50ohm.
My problem is that when i increase the length of the microstrip line i have serious oscillations in s11(RL).
Serious meaning that s11 is between -30dB and -55dB.
Is microstrip line acting like this or is it something that i' m doing wrong?
Here's a picture of my design. Im using CST MWS.

I have a problem. I'm designing a patch antenna array. I'm feeding the antenna with a microstrip line with a characteristic impedance of 50ohm.
My problem is that when i increase the length of the microstrip line i have serious oscillations in s11(RL).
Serious meaning that s11 is between -30dB and -55dB.
Is microstrip line acting like this or is it something that i' m doing wrong?
Here's a picture of my design. Im using CST MWS.
