【国外标准】 Identification cards - Contactless integrated circuit cards - Proximity cards - Multiple PICCs in a single PCD field, a Technical Report prepared by INCITS and registered with ANSI

Presents a collation of industry experience of technical issues resulting from the presence of multiple PICCs (proximity card or object) in the field of a PCD (proximity coupling device). It describes how resonance frequencies may shift, how individual PICCs may see a reduced field strength, how multiple PICCs load the PCD, how they may change the local modulation signal and how PICCs should manage their identities to aid support of simultaneous usage.