Novel Microstrip Bandpass Filter for 5G mm-Wave wireless communications

Abstract

This paper presents the design of a novel bandpass filter specifically tailored for 5G mm-Wave communications. The filter utilizes a rectangle loop resonator loaded with a stepped impedance line stub at its center. The overall dimensions of the filter are 11.22×13mm2. The design incorporates Rogers RT/duroid 5880 substrate with a relative dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.64 mm. The resulting filter exhibits a center frequency at 22.65 GHz, with a bandwidth of 10.5 GHz and a fractional bandwidth (FBW) of 46.36%. The reflection coefficient is approximately -39.12 dB, while the insertion loss of about -0.59 dB. We conducted a parametric study to choose the optimal value concerning the form and size of the introduced slot. To evaluate the filter's performance, simulations and assessments were carried out using the High-Frequency Structure Simulator (HFSS). The obtained results demonstrate the filter's suitability for 5G applications in various countries, including the United States (24.75-25.25 GHz), United Kingdom (26 GHz), Australia (24.25-27.5 GHz), Canada (26.5-27.5 GHz), Europe (24.5-27.5 GHz), China (24.75-27.5 GHz), Japan (26.6-27 GHz), and India (24.25-27.5 GHz).