Meal cards can be used with acrylic card sets. A meal card is usually an inductive IC card, which is a kind of radio frequency card. The basic principle of ic card is that the RF reader sends a set of electromagnetic waves with fixed frequency to the IC card, and there is an LC series resonant circuit in the card, the frequency of which is the same as the frequency emitted by the reader, so that under the excitation of electromagnetic waves, the LC resonant circuit generates * * * vibration to charge the capacitor.

Meal card:

Meal card, a kind of IC card, can be used to buy meals and vegetables at designated places. Meal cards are very popular in middle schools and university campuses, as well as in all large factories, and they are quite convenient to use. Many universities use one card. All-in-one card can be used not only as a meal card and other consumption functions, but also as an identity certificate at school.