Compact metamaterial inspired structure with bandpass characteristics for penta‐band applications using virtual ground concept

Abstract

A 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.

Realization and validation of continuous tunable metasurface for high resolution beam steering reflector at K‐band frequency

“…MS is used in various frequencies for different electrical engineering fields 1 . For example, compact filters 2,3 and special antennas 4 in sub 6 GHz, reflecting focusing in K‐band, 5 flat parabolic surface for imaging, and beam propagation manipulation in W‐band 6 . MS perfect absorber was designed to detect micro‐poisons in drinking water in millimeter‐wave 7 .…”

Compact D-CRLH Structure for Filtering Power Divider

“…9, it is concluded that the resonance frequency of designed bandpass filter is mainly controlled by series parameter due to shorted structure. The metamaterial properties, like complex permittivity (ε) and permeability (μ), can be evaluated using scattering parameters of D-CRLH resonator by the help of refractive index (η) and Bloch impedance (Z B ), which is calculated using scattering parameters value of D-CRLH resonator [23,24].…”

Miniaturized quad‐band filter with improved selectivity using split ring resonators and metallic strips

“…A passband filter with quint-band response has been designed with a ring resonator, meander line and triangular stub. 18 In which two resonating modes has been achieved in each passband because of two sets of resonators. A bandpass filter with four passbands has been designed using square-ring resonators having quadruple-mode and virtual capacitive coupling structure.…”