​Hello,In order to get a small antenna you have to increase the number of turns of the antenna, reduce copper width.Ultimately, you can use design an antenna etched on both side of the PCB but eDesign Suite does not allow this.Have a nice dayDenis 

​Hello,the characteristic value of the antennae is; inductance is around 4.7uH at F=13.8MHz.Have a nice dayDenis

​Hello,internal capacitance is the same in practice. So you can use same antenna for both chips.Have a nice dayDenis

​Hi Barak,Unfortunately I don't have land patterning for DFN8, that's why I proposed DFN12 to be used as a example.Have a nice dayDenis 

​Hello Barak,land pattern usually also depend on stencil characteristics.You can get an example of DFN12 land patterning on our website from ST25DV ANT-C5 gerber files, located here: https://www.st.com/content/st_com/en/products/evaluation-tools/prod...