A　compact　ultra-high　frequency　radio　frequency　identification　tag　antenna　loaded　with　a　pair　of　rectangular　coupling　rings　for　two-side　anti-metal　performance　is　proposed.　It　evolves　from　a　planar　inverted-F　antenna　and　has　the　same　upper　and　lower　structures.　A　pair　of　coupling　rings　is　symmetrically　loaded　on　the　inner　sides　of　the　upper　and　lower　substrates,　and　the　tag＇s　maximum　power　transmission　coefficient　can　be　achieved　when　either　side　of　the　antenna　is　placed　on　a　metallic　plate.　The　proposed　tag　antenna　maintains　a　compact　size　of　34　mm　x　28　mm　x　5　mm.　The　measured　results　show　that　it　has　the　lowest　sensitivity　of　-14.8　dBm　when　the　lower　side　is　on　a　metallic　plate　and　the　lowest　sensitivity　of　-14.2　dBm　when　the　upper　side　is　on　a　metallic　plate.　The　proposed　tag　antenna　is　featured　in　a　compact　size,　low　sensitivities,　and　anti-metal　performance　on　two　sides.　It　may　be　used　in　the　areas　such　as　the　industrial　internet　of　things.