Journal ArticleDOI
Spurious passband suppression in microstrip coupled line band pass filters by means of split ring resonators
Joan Garcia-Garcia,Ferran Martin,Francisco Falcone,Jordi Bonache,Ignacio Gil,Txema Lopetegi,Miguel A. G. Laso,M. Sorolla,Ricardo Marqués +8 more
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TLDR
In this paper, split ring resonators (SRRs) are used to suppress spurious passband suppression in microstrip coupled line band pass filters by means of split-ring resonators.Abstract:
In this letter, spurious passband suppression in microstrip coupled line band pass filters by means of split ring resonators (SRRs) is demonstrated for the first time. By etching SRRs in the upper substrate side, in close proximity to conductor strip, strong magnetic coupling between line and rings arises at the resonant frequency of SRRs. This inhibits signal propagation in the vicinity of that frequency, allowing the rejection of undesired passbands by properly tuning SRRs. To test this novel technique, we have designed and fabricated two different SSRs-based filters. In one case, the rings have been designed to suppress only the first spurious band, and SRRs have been etched at both sides of the 50-/spl Omega/ access lines. For the other prototype, SRRs have been etched on the active device region (i.e., surrounding the parallel coupled lines) and have been tuned to eliminate the first and second undesired bands. The measured frequency responses for these devices confirm the efficiency of this technique to suppress frequency parasitics, with rejection levels near 40 dBs, leaving the passband unaltered. Since SRRs are small particles (with sub-wavelength dimensions at the resonant frequency), this approach does not add extra area to the final layouts. Moreover, the conventional design methodology of the filters holds.read more
Citations
More filters
Journal ArticleDOI
Equivalent-circuit models for split-ring resonators and complementary split-ring resonators coupled to planar transmission lines
Juan D. Baena,Jordi Bonache,Ferran Martin,R.M. Sillero,Francisco Falcone,Txema Lopetegi,Miguel A. G. Laso,Joan Garcia-Garcia,Ignacio Gil,M.F. Portillo,Mario Sorolla +10 more
TL;DR: In this paper, a new approach for the development of planar metamaterial structures is developed, and analytical equivalent circuit models are proposed for isolated and coupled split-ring resonators/CSRRs coupled to planar transmission lines.
Journal ArticleDOI
Substrate Integrated Waveguide Loaded by Complementary Split-Ring Resonators and Its Applications to Miniaturized Waveguide Filters
Yuandan Dong,Tao Yang,T. Itoh +2 more
TL;DR: In this paper, a substrate integrated waveguide with square complementary split-ring resonators (CSRRs) etched on the waveguide surface is investigated, which allows the implementation of a forward-wave passband propagating below the characteristic cutoff frequency of waveguide.
Journal ArticleDOI
Novel microstrip bandpass filters based on complementary split-ring resonators
TL;DR: In this paper, a new methodology for the design of compact planar filters in microstrip technology is proposed, based on cascading filter stages consisting of the combination of complementary split-ring resonators (CSRRs), series capacitive gaps, and grounded stubs.
Journal ArticleDOI
On the electrical characteristics of complementary metamaterial resonators
TL;DR: In this paper, a method to obtain the electrical characteristics of complementary split ring resonators (CSRRs) coupled to planar transmission lines is presented, which is of actual interest for the design of microwave circuits and metamaterials based on these complementary resonant particles.
Journal ArticleDOI
Microwave filters with improved stopband based on sub-wavelength resonators
Joan Garcia-Garcia,Ferran Martin,Francisco Falcone,Jordi Bonache,Juan D. Baena,Ignacio Gil,Esteve Amat,Txema Lopetegi,Miguel A. G. Laso,J.A.M. Iturmendi,M. Sorolla,Ricardo Marqués +11 more
TL;DR: In this article, the authors demonstrate the potential of sub-wavelength resonators, namely, split-ring resonators and complementary split ring resonators to suppress undesired spurious bands in microwave filters, a key aspect to improve their rejection bandwidths.
References
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Journal ArticleDOI
Magnetism from conductors and enhanced nonlinear phenomena
TL;DR: In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.
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Photonic band-gap structures
TL;DR: In this article, the photonic band gap structures, those three-dimensional periodic dielectric structures that are to photon waves as semiconductor crystals are to electron waves, are discussed.
Journal ArticleDOI
Role of bianisotropy in negative permeability and left-handed metamaterials
TL;DR: In this article, the existence of bianisotropic effects in those materials is investigated, making use of an approximate model, and some unexplained properties of the electromagnetic-wave propagation through these media, revealed by closer inspection of previous numerical simulations and experimental work, are highlighted.
Journal ArticleDOI
Comparative analysis of edge- and broadside- coupled split ring resonators for metamaterial design - theory and experiments
TL;DR: In this article, a quasi-analytical and self-consistent model was developed to compute the polarizabilities of split ring resonators (SRRs) and an experimental setup was also proposed for measuring the magnetic polarizability of these structures.