Noncontact communication medium, magnetic tape cartridge, and manufacturing method of noncontact communication medium

A manufacturing method of a noncontact communication medium including a processing circuit and an external capacitor, the processing circuit being mounted on a substrate having a coil to induce power by action of an external magnetic field applied from an outside, the processing circuit having an internal capacitor, the external capacitor being externally attached to the processing circuit, the external capacitor, the internal capacitor, and the coil constituting a resonance circuit resonating at a predetermined resonance frequency by the action of the external magnetic field, the manufacturing method comprising:

• a Q-value determination process in which a Q-value of the resonance circuit is determined in a case where the external capacitor is connected in parallel with the internal capacitor;
• an external capacitor formation process in which the external capacitor is formed on a condition that, in a case where the external capacitor is connected in parallel with the internal capacitor, the Q-value of the resonance circuit becomes the Q-value determined in the Q-value determination process;
• and
• a connection process in which the external capacitor formed in the external capacitor formation process is connected in parallel with the internal capacitor.