Captain reported during takeoff from ATL receiving a possibly erroneous wind shear warning. Captain stated that earlier in the same area; the flight crew had received a radar altimeter caution message.

Narrative

During takeoff from Runway 08R in Atlanta we received a windshear warning. It occurred at about 500 feet; shortly after speed and NAV mode were called for and before autopilot was engaged. Winds were calm and the flight director guidance was followed and power was added. However; it felt smooth and calm throughout the warning and the guidance was in line with the normal departure profile. The rotation was possibly more rapid than usual but did not seem excessive enough to warrant a windshear warning. We departed after a medium large transport category aircraft and did not experience any wake turbulence. The airspeed never dropped below v2+10 and the windshear warning ended after a few seconds. After the windshear warning stopped; flaps were retracted as normal and the rest of the flight was uneventful. We did not specifically notice what the radar altimeters read but earlier on the trip around the same area we received an EFIS COMP MON caution for the radar altimeter around the same location. It is possible the windshear was erroneous and either caused by an abrupt rotation or 5G interference in accordance with the latest company memo. Windshear warning which is suspected to be erroneous and caused by either excessive rotation rate or 5G interference. No suggestions or corrective action unless the windshear warning is determined to be pilot induced; in either case I will take greater care to rotate smoothly and gradually. Otherwise the windshear warning was handled well by both crew members and was a nonissue.