A method of making a heater structure and a corresponding heater structure are disclosed. A total of contact areas of first contact portions and the second contact portions with a body portion is larger than a total of contact areas of the first claw and the second claw with the body portion. The first signal property of the transmission signal is representative of the first data stream and the second signal property of the transmission signal is representative of the second data stream. Each of the insertion portions includes a plurality of slits communicating with each other at the center of each of the insertion portions.