A SONOS device and a method of manufacturing the same is provided. The initial section and the section of enlarged cross-section have, respectively, a first width and a second width, and the ratio between the second width and the first width of a first transverse groove belonging to a short pitch module is greater than the ratio between the second width and the first width of a first transverse groove belonging to a long pitch module. Then, a heat treatment for generating donors is performed. The wire connects the ball part and the second electrode. As a result, a nearly harmonic current with a constant amplitude is generated in the transmitting antenna.