Help:: Help:: Rectangular Microstrip Patch Antenna

[Transist]

Hi friends.....
I am working on rectangular micro strip antenna as a part of my project.
At earlier point from this website i have read about "How to measure input impedance at edge of the antenna"
The answer is " By plotting S11 on smith-chart"
I have done same and get result as below.
My question is that " How i read this impedance from this smith-chart". "What is the value of impedance".

 

[D.A.(Tony)Stewart]

YOu have not defined the range of FREQ. But you need more points.

Looking in as S11 the ideal point is the center of the chart.

( usually normalized to a 50Ω port and is represented by the centre of the Smith chart.)
https://en.wikipedia.org/wiki/Smith_chart