Parallel-coupled line bandpass filter design using different substrates for fifth generation wireless communication applications

The aim of this paper is to propose characterization of a compact microstrip bandpass filter (BPF) design for fifth generation (5G) wireless communication applications concerning the design frequency of 15 GHz. The BPF design consists of quarter wave parallel-coupled line resonators and additional small resonator attached between the first/last coupled-line section and the ports´ 50 ohm transmission line. The characterization is based on the analysis of different substrates with the selected relative permittivity of 2.2 (RT/Duroid 5880), 3.55 (RO4003C), 4.70 (TMM4), 10.7 (RO6010) and 11.20 (RO3010). The proposed design with RO6010 substrate exhibits an improvement in the bandwidth performance. The design and analysis are performed via the use of Keysight´s Advanced Design System (ADS) 2015 simulator.