DESIGN AND SIMULATION OF A 4TH ORDER HIGH FREQUENCY BANDPASS FILTER FOR RADAR COMMUNICATION SYSTEMS

Electronic filters are frequency-selective circuits design to permit specific range of frequencies to pass through the electronic circuit and attenuate (or reject) others. These circuits are design to have different construction for different applications such as low-pass filter (LPF), high-pass filter (HPF), band-pass filters (BPF) and band-reject filter (BRF). In this paper, we deign and simulate a bandpass filter based on fourth order Butterworth filter design method that operate at 3.6 MHz intermediate frequency. The results obtained by implementing and simulating the original and adjusted design using AWR software showed that the bandpass filter operate within the desired design requirement with the anticipated -3 dB bandwidth of 800 kHz with the original design values, while approximately 700 kHz was obtained with the adjusted design due to practical components availability and limitations. Overall, the frequency responses of the designed and simulated filter in both original and adjusted design operating at 3.6 MHz and 3.4 MHz respectively, indicate an excellent output frequency response with the flat amplitude response of a Butterworth filter as well as compromised between attenuation characteristic and group delay.