Multiband bandpass filter with asymmetric dual-band response based on metacell

The impressive growth in present-day wireless communication systems demands compact, low-power, cost-effective, planar multiband microwave devices to increase the speed of communication and reduce hardware requirements, which subsequently reduce the power requirement of the system. Accordingly, this article aims to design a multiband microstrip bandpass filter with asymmetric dual-band response based on metacell. The proposed filter is designed for wide and narrow dual-band responses with fractional bandwidths of 72% and 2.6%, respectively. For the first time in this article, a new application of metacell in the design of dual-band filters is discussed. A folded asymmetric step-impedance resonator and a novel metacell structure-Dual loop split ring resonators are used to obtain wideband and dual-band responses, respectively. The proposed work discusses the design methodology, and analysis of metacell structure based on a quasistatic model and compares simulation results with experimental results. The proposed dual-band filter presents an insertion loss (S-21) of less than 1 dB and input reflection coefficient (S-11) greater than 10 dB in both passbands centered at 3.3 and 5.7 GHz. The designed filter is suitable for wireless communication applications-Wireless Access in the Vehicular Environment.