Realization of Active Band Pass Filter for Low Radio Frequency Identification (RFID) Model

An active 4th order band-pass filter for RFID reader is fabricated and simulated. For this purpose, an active bandpass filter is required for the front-end system because all signals outside the 10-20 kHz time-varying signal backscattered by the tag need to be rejected. The filter has been designed from some given specifications, one of which is, that the filter needs to have a Butterworth response. The values for the passive components are calculated, and the circuits are then simulated using MATLAB commercial software.