Design of Bandpass Filter for RF bands Below 6 GHz for 5G Applications

Abstract

The number of frequency bands requiring band-pass filters has improved significantly with the launch of 5G mobile applications. This paper gives an overview of a method for designing a band-pass filter based on low-pass filter parameters. This paper gives an overview of a method for designing a band-pass filter based on low-pass filter parameters. This paper presented a compact microstrip band-pass filter (BPF) covering the spectral bandwidth from 3.4 to 3.8 GHz for 5G wireless communications. The BPF microstrip uses four resonators with 50 Ω transmission line impedances for the input/output terminals. The coupling between the lines is tuned to resonate at the centre frequency with third-order band-pass Butterworth properties. The proposed filter is designed on a Rogers RT/duroid_5870 substrate with a relative dielectric constant εr= 2.33. The proposed filter is simulated and optimized using ADS. Simulation results show that the proposed filter works adequately in [3.4 - 3.8 GHz] band and could be considered a good choice for 5G technology.