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Tuning mutually coupled RFID antennas for high usage scenarios

RFID technologies are now commonplace with applications such as: cashless payments, access control, library book tagging and electronic passports to name but a few applications. This paper addresses one of the issues that is frequently encountered in near field RFID implementations which is the effects of placing resonant antenna heads in close proximity. This situation arises during the design of RFID tunnels or ePassport readers were there is a need to have two or more readers in close proximity in order to read a credential in differing orientations or locations. This paper shows that design of such systems can be accommodated provided coupling levels remain low.