Micro-strip　patch　antenna　strain　sensing　technology,　as　a　new　passive　detection　technique,　can　examine　the　structure　strain　wirelessly.　It＇s　of　great　significance　for　structural　health　monitoring　of　bearing　structures　in　high　end　equipment.　The　wireless　detection　distance　plays　a　vital　role　in　the　industrial　application.　This　research　aims　to　improve　the　micro-strip　antenna　strain　sensor　by　introducing　the　frequency　doubling　technique,　in　order　to　expand　the　wireless　detection　distance.　Generally,　the　sensor　consists　of　three　components:　a　receiving　patch　antenna,　a　transmitting　patch　antenna,　and　a　frequency　multiplier　integrated　with　electrical　matching　circuit.　This　paper　presents　the　design,　simulation,　and　experiments　for　a　frequency　doubling　antenna　sensor.　Experimental　results　show　that　the　resonant　frequency　versus　strain　possesses　a　linear　relationship,　which　consists　with　the　simulated　results.　©　2020　Elsevier　B.V.