Študija uporabe antenskega sistema izpraševalnika za pasivno bremensko modulacijo

SVETE, TILEN (author), Pleteršek, Anton (mentor)

Delo je osredotočeno na problem uporabe antenskega sistema izpraševalnika ali bralnika (angl. proximity coupling device oz. PCD, reader, interrogator, poller, initiator, itd) TRF7970AEVM za pasivno bremensko modulacijo v načinu oponašanja značke ali brezkontaktne pametne kartice (angl. proximity integrated circuit card oz. PICC, tag, listener, target, transponder, itd.) ali angl. card emulation mode. Izvajanje meritev po standardih ISO/IEC 10373, NFC Forum in EMV Contactless razkriva težave TRF7970AEVM pri zagotavljanju dovolj močne amplitudne modulacije pri testnih pogojih. Meritve služijo tudi kot osnova za simulacijsko modelno vezje ter prototipno modelno vezje s podobnim vedenjem kot TRF7970AEVM, na katerem se preizkusi vplive omejevanja napetosti izhodne stopnje z Zener diodo, kot tudi drugo obliko izvedbe z dodano diodo in n-kanalnim MOS tranzistorjem na anteni. Slednja se je izkazala za najboljšo izmed vseh preizkušanih izvedb.

• Language: Slovenian
• Keywords: ISO, NFC Forum, EMV Contactless, bremenska modulacija, prilagoditveno vezje, amplitudna modulacija, fazna modulacija
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2014
• PID: 20.500.12556/RUL-29478
• Publication date in RUL: 17.09.2014

Secondary language

• Language: English
• Title: Study of using reader antenna system for passive load modulation in card emulation mode

Abstract

The thesis addresses the problems of using the antenna system of the TRF7970AEVM development board for passive load modulation in card emulation mode. The measurements, as defined by the standards ISO/IEC 10373, NFC Forum and EMV Contactless, revealed inherent problems with the load modulation of the TRF7970AEVM. A strong signal was in some cases present mostly in the carrier phase, something not all standards and regulations measure. The measurements also serve as a basis for a simulation model circuit as well as a prototype circuit with similar behavior to the TRF7970AEVM, on which output driver voltage limitations methods, in the form of an added Zener diode, are tested. In addition, other load modulation implementations are tested, namely with an added diode and n-channel MOS transistor on the antenna. The latter proved the most successful out of all the tested implementations.

• Keywords: ISO, NFC Forum, EMV Contactless, load modulation, matching circuit, amplitude modulation, phase modulation