Dear Dialog Team,
We are trying to leverage the antenna used in the DA14580_RD_WLCSP_SMTAG2_vC design for our Tags based on DA14585, but we have few queries:
1) Why is there a trace at the bottom layer of the antenna too and why are there vias connecting the top and bottom traces of the antenna? Don't PCB antennas have a trace on a single layer?
2) Can we remove the bottom trace of the antenna? Will it affect the antenna performance if we do so?
3) We have also gone through the AN-B-027 App Note that has a similar antenna like that of the smart tag, but in the app note, it is mentioned that "The dimensions above are given for a typical FR1 PCB substrate, 1 mm thick. The antenna length is adjusted for resonance, including a 1 mm plastic enclosure placed in contact with the PCB antenna". So we can't use the antenna with FR4 substrate, is my understanding correct? If we are to use what should be the thickness of the PCB and FR4 substrate? Can we achieve a total PCB thickness of 1mm with the Single Layer Printed IFA, 1 mm Substrate antenna design?