Parallel coupled bandpass filter on metamaterial substrate / Ahmad Farhan Badrul Aziz

Filters play important roles in many radio frequencies (RF) or microwave applications including cellular radio, satellite communication, and radar to separate or combine different frequencies. Filter is used to select and confine the RF or microwave signals within assigned spectral limits. Parallel Coupled Bandpass Filter (BPF) on Metamaterial Substrate was designed using CST Microwave Studio Software. There were two filters; conventional and metamaterial parallel coupled BPF. The parallel coupled filter was designed using the basic knowledge of odd and even wave coupling of transmission lines, which results in odd and even characteristic line impedances. Defected ground structure (DGS) was used to obtain the metamaterial properties on the substrate so that the characterization of return loss, insertion loss, bandwidth and the size of both filters can be analyzed. The return loss was improved about 22.5%, bandwidth about 15.53% and the size of the filter was reduced about 27% from the conventional by applying the metamaterial.