Overview
The A4503CS is an antenna made by Laird with 5 pins. - Antennas ROHS.
JLCPCB lists it (part C7208623).
Symbol
The library has no symbol for this part yet.
Footprint
The library has no footprint for this part yet.
Questions
Where is the A4503CS datasheet?
Laird publishes it: the Datasheet link on this page opens it.
Where can I order the A4503CS?
JLCPCB lists it as part C7208623, with 0 in stock; the sellers' links on this page open their listings.