A　low-profile　ultra-high　frequency　(UHF)　radio　frequency　identification　(RFID)　tag　antenna　for　double-sided　anti-metal　applications　is　proposed.　The　antenna　comprises　a　middle　layer　of　radiation　patch,　which　is　sandwiched　between　two　layers　of　foam　substrates,　each　with　a　thickness　of　0.5　mm,　and　flanked　by　two　layers　of　ground　plane.　A　rectangular　loop　is　designed　on　the　radiation　patch　to　expand　the　frequency　band　and　optimize　impedance　matching.　Particularly,　one　side　of　the　radiation　patch　is　shorted　to　the　ground　through　a　slotted　stub　to　reduce　the　antenna　size.　The　tag　antenna　is　compact　with　a　dimension　of　38　mm　×　20　mm　×　1.15　mm　(0.1159λ×0.061λ×0.0035λ　at　915　MHz).　When　the　two　ground　planes　are　individually　mounted　on　metallic　objects,　the　read　distances　are　5.4　m　and　5.2　m,　respectively.　The　proposed　tag　antenna　demonstrates　double-sided　metal　resistance,　making　it　highly　suitable　for　use　in　the　industrial　internet　of　things　field.　©　2024,　Electromagnetics　Academy.　All　rights　reserved.