In this post I elaborated somewhat on the construction of an Es’hail2
amateur transponder feed.

Yesterday I (re)measured the 2.4 GHz feed a on a vector network analyser @work.
After some fiddling with the matching stub a truly fine 50Ω match was obtained!

I reckon the pictures below are self explanatory (click on them to enlarge in new tabs).

Fig.1 Test array in the laboratory                           Fig.2 Smith Chart between 2300 – 2500 MHz

Fig.3 Close up of matching stub                           Fig.4 Return loss response between 2300 – 2500 MHz