Abstract
In this paper, two designs of bandstop filters are presented and implemented, each one composed of a coplanar waveguide loaded with a resonator. The first design has a structure with circular resonators, and the second design is a frequency reconfigurable filter with a rectangular spiral resonator and PIN diodes. The designs are based on the use of metamaterial to create notch filters for microwave applications. The Nicolson--Ross--Weir method, used to extract the refractive index, is also described to highlight the supernatural electromagnetic characteristic of metamaterials. From the simulation results, the filters exhibit high frequency selectivity via the presence of reflection zeros. In addition, for one or two rejection bands to isolate the WiFi band in a wireless communication system (depending on states of PIN diodes, small dimension, and low in-band insertion loss of better than 1 dB), the bandpass response could be dynamically tuned to different frequency bands and achieve good out-of-band suppression and linearity. The experimental results of the proposed structures are reported; the extracted data are also compared with simulation results, revealing good agreement.
Highlights
The basic structures of metamaterials feed a promising technological alternative aiming to meet new constraints of miniaturization and radio-electric performance reconfigurable systems at a low cost [1]
This paper presented a new technique for a frequency reconfigurable compact CPW metamaterial bandstop filter based on PIN diodes
The compactness and selectiveness of this filter was achieved by using split ring resonator (SRR) or RSR printed on a CPW transmission line
Summary
The basic structures of metamaterials feed a promising technological alternative aiming to meet new constraints of miniaturization and radio-electric performance reconfigurable systems at a low cost [1]. The agility technique studied was based on the loading of the cell by active electronic elements located in suitable positions according to an optimal electromagnetic topography [20,21]. In this context, a novel methodological approach was developed for the design of a reconfigurable RSR filter loaded by PIN diodes [22,23,24]. In this work, both functions are combined in the same reconfigurable filter while controlling the creation of single-band-rejection and dual-band-rejection by an electrical command of PIN diode state (ON/OFF). The obtained results verified the band rejection with low-loss characteristics
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