Performance Evaluation of FIR based Active Band Pass Filter for SAR Applications

Technologies have advanced rapidly in the design of filters to enhance effectiveness of Signal to Noise Ratio for mobile communications including SAR applications. In this research work Butter worth active band pass filter for 2 to 6 GHz was designed using XILINX and MATLAB software’s. This was optimized, analyzed and evaluated keeping the sampling frequency at 48 GHz and Kiser window for 0.5 Beta. Further to verify the simulated results hardware circuitry is also designed based on SPARTAN-3 FPGA–development kit. Asb) part of this research work 7-9 KHz Butter worth active band pass filter was designed using active components which was put into circuit, tested by passing a sinusoidal test signal along with noise and the filtered output signals are presented. Based on these experimental results conclusions have been drawn for 2 to 6 GHz filter for SAR applications. It is observed that when signals are received with heavy noise the coefficients of filters are selected in such way that the noise content can be minimized to great extent.