Design and simulation of Eighth-order Active-R Band pass filter for UHF Radio Frequency Identification system using Biquadratic Topology

In this paper an Eighth-order Active-R Band pass filter using Biquadrtic topology at variable centre frequencies and fixed quality factor Q of 30 was Designed and simulated using MULTISIM work bench (version 11.0). the simulated response characteristics show that, the filter gives the highest Mid band gain of 33.452dB at f 0 =40KHz and the least Mid band gain of -8.820dB at f 0 =640KHz which is in agreement with filter theory. The bandwidth and Gain roll-off are also in perfect agreement with filter theory. Therefore the filter meets design specifications, performs well and therefore can be used in the receiver of an RFID system in the UHF region.. A shift in the centre frequency was observed but not out of range as it recorded 0.7% deviation from the actual centre frequency which is negligible. The filter therefore performed well and meets its specification.