Abstract
AbstractA simple and compact metamaterial inspired filter structure for penta‐band bandpass response with minimum insertion loss is proposed in this article. The designed filter structure consists of an S‐shaped ring and two sets of meander line inductors, which provides series and shunt parallel LC circuit utilizing triangular stubs. Triangular stubs are realized as virtual grounds, which give a series combination of inductance and capacitance. A penta‐band bandpass filter operates at 1.06/1.85/2.37/2.78/3.17 GHz with the corresponding 3‐dB fractional bandwidth of 56.6%, 22.2%, 11.4%, 9.0%, and 11.6%, respectively. The operating frequencies and transmission zeros can be scaled up and down by varying the physical parameters of the designed structure. The size of the filter is 0.16λg × 0.14λg (19 mm × 17 mm) at the center frequency (1.06 GHz) of the first passband. The metamaterial properties have been verified by its extracted refractive index diagram. The filter performance has been validated through electromagnetic simulation and experimental measurements.
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