Design of a DSRR FSS for CDMA/RFID isolation

In the mobile communication systems, high-power repeaters produce intermodulation signals, which can create severe interference in other RF systems. For example, inter-modulation signals generated by a code division multiple access (CDMA; 824 MHz ~ 894 MHz) repeater might interrupt a radio frequency identification (RFID; 917 MHz ~ 923 MHz) tag signal; thus the RFID reader receives incorrect information. Frequency selective surfaces (FSSs) can overcome this problem. Extensive research on FSSs has been conducted [1–6], but few FSS had been reported which enhances isolation between CDMA and RFID.