Design of multiband metamaterial microwave bpfs for microwave wireless applications

Abstract

This work proposes an end-coupled half wavelength resonator dual bandpass filter (BPF). The filter is designed to have a 10.9% fractional bandwidth (FBW) at center frequency of 5.5GHz. Dual-band BPF with more drastic size reduction can be obtained by using metallic vias act as shunt-connected inductors to get negative permittivity (-ε). The process of etching rectangular split ring resonators (SRRs) instead of open-end microstrip transmission lines (TLs) for planar BPF to provide negative permeability (-μ) is presented. The primary goals of these ideas are to get reduction in size, dual- and tri- bands frequency responses. These metamaterial transmission lines are suitable for microwave filter applications where miniaturization, dual- and tri-narrow passbands are achieved. Numerical results for the end-coupled microwave BPFs design are obtained and filters are simulated using software package HFSS. All presented designs are implemented on the Roger RO3210 substrate material that has; dielectric constant εr=10.8, and substrate height h =1.27 mm.