Part Number: CC1350
Tool/software: Code Composer Studio
Hello,
I'm designing a PCB using CC1350 and I was studying the antenna matching circuit for Sub-1GHz.
However, Smith Chart indicates a far from 50 Ohms charge seen from C15 when I add the recommended components and use the antenna impedance 10 - j88 Ohms at 868MHz (this impedance is indicated in the antenna Design Note http://www.ti.com/lit/an/swra416/swra416.pdf). The last image shows the Smith Chart, where I had 1.42 + j54.4 (expecting something around 50 + j0) seen before C15. In addition, C23 didn't change this situation significantly.
Is this the right antenna impedance to consider? I was wondering why I am getting such different results.
Thank you for your attention,
