I am new to antenna design and teaching myself how to optimize antennas using a VNA.
I have created a monopole antenna on a PCB (i.e. a single length of track.) The antenna can be fed via a PI network and is connected to my NanoVNA via an SMA connector. My mission is to understand what values of L and C I would use in my PI network to match this antenna.
I have attached the Smith chart and readings, along with the explanation of how I think I do this, (also captured below.)
To make this an ideal 50Ω antenna, is the following approach correct?
- Calculate value of a shunt inductor to move value to point X following the red arrow on the chart to, for example, on the 50Ω impedance line
- Calculate the value of a series capacitor to move value along the green line to point Y. Is 50Ω the ideal point?
Using the readings from my NanoVNA, how do I calculate the shunt(s) (L or C ) and the series (L or C) values?