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.
![adsr32f42f.JPG adsr32f42f.JPG](https://www.edaboard.com/data/attachments/52/52151-f2e1a2c172ef9783d85c9aaaa6949403.jpg)
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.
![adsr32f42f.JPG adsr32f42f.JPG](https://www.edaboard.com/data/attachments/52/52151-f2e1a2c172ef9783d85c9aaaa6949403.jpg)