To secure the power of sensor nodes for wireless sensor network in greenhouse, we propose a cavity resonance enabled wireless power transfer that can reduce constraints on installation position. This paper presents a differential power receiver that is one of the key technologies in the proposed method. The structure is a meander line structure and the operation principle by electromagnetic field analysis was confirmed. The rectifier employed a voltage doubler rectifier to supply power to the charging capacitor mounted on the sensor node. We conducted a power transmission experiment using these prototypes and confirmed the driving of the sensor node.