Composite Right/Left-Handed Metamaterial Transmission Lines Based on Complementary Split-Rings Resonators and Their Applications to Very Wideband and Compact Filter Design (original) (raw)
Related papers
2015
A compact and sharp rejection UWB microstrip bandpass filter is developed using left handed metamaterials. For realizing a backward-wave propagation medium, two split ring resonator (CSRR) in the back substrate side and also one series capacitor etched in the host line, are used to produce a negative effective e and μ, simultaneously. Moreover, in the proposed structure, two doublets parallel coupling gaps is placed at each side of the series capacitor. In comparison with the other similar filters, this structure shows a significantly wider passband due to the introduction of a cross-coupling between the feed lines (input and output) which generate four pairs of attenuation poles in the passband. On top of that, using two CSRRs and series capacitor leads to the addition of two extra transmission poles at the lower and upper edges of the filter. Consequently, a compact six-pole ultra-wide bandpass filter is designed and fabricated which exhibits extremely sharp rejection skirts arou...
This paper suggests the design of a compact two-pole bandpass filter based on the via-free composite right/left-handed (CRLH) metamaterial transmission line (TL) structure with radial stubs. The Bandpass Filter (BPF) design uses these subwavelength resonators (CRLH unit cell) along with admittance inverters to control the coupling. It is found that the suggested method enables up to 70% size reduction from the conventional filters such as the parallel coupled type which is generally designed on the basis of the half-wavelength resonance. The proposed technique is validated by experimental results.
Broadband Resonant-Type Metamaterial Transmission Lines
IEEE Microwave and Wireless Components Letters, 2007
In this letter, it is shown that, contrary to previous assumptions, the broadband characteristics of metamaterial transmission lines are not exclusive of the so called loaded composite right/left handed (CRLH) structures. In the balance condition, the typical frequency gap between the left handed (LH) and right handed (RH) transmission bands of these CRLH lines collapses, the characteristic impedance varies smoothly in the vicinity of the transition frequency, and broadband response results. However, through an appropriate design, similar behavior can be obtained in resonant type metamaterial transmission lines, namely transmission lines loaded with complementary split rings resonators. A detailed analysis of the structures, based on the equivalent circuit model is provided, and implications of balancing are pointed out. In this letter, it is clearly demonstrated that broadband balanced CRLH lines can also be implemented by means of the resonant type approach.
2010 IEEE Asia-Pacific Conference on Applied Electromagnetics, APACE 2010 - Proceedings, 2010
A compact two-pole bandpass filter based on the composite right/left-handed (CRLH) metamaterial transmission line structure is proposed in this paper. In detail, subwavelength resonators are realized through the zeroth order resonance (ZOR), and inverter structures are proposed to control the coupling between neighbouring ZOR resonators. The proposed technique is validated by the EM predictions, the proof of metamaterial properties with the ZOR field distributions and extracted constitutive parameters, and measurements. Size independent resonance property of the ZOR combined with homogeneity condition of the LH TL unit cell is utilized in the size reduction of bandpass filter. It is found that the suggested method enables the remarkable size reduction from the conventional filters such as the parallel coupled type which is designed on the basis of the half-wavelength resonance. The proposed technique is also validated by the experimental results.
IEEE Transactions on Microwave Theory and Techniques, 2009
This paper is focused on the application of open split ring resonators (OSRRs) and their dual counterparts, open complementary split ring resonators (OCSRRs), to the synthesis of composite right/left-handed transmission lines, that is, artificial lines exhibiting backward wave propagation at low frequencies and forward wave propagation at high frequencies. Due to the small dimensions of these resonators, the resulting lines are very compact. Several artificial lines, with different electrical characteristics and topologies, are reported as illustrative examples. It is shown that these artificial lines can be applied to the synthesis of dual-band components and bandpass filters, and two prototype device examples are designed and fabricated in coplanar waveguide technology: a dual-band impedance inverter applied to a dual-band power divider, and an order-3 wide-band bandpass filter. Finally, it is also demonstrated that OSRRs and OCSRRs can be combined for the synthesis of band pass filters in microstrip technology. Since OSRRs and OCSRRs are described by means of series and shunt resonant tanks, respectively, and they are electrically small, their potential to the design of semi lumped planar microwave devices is very high. Index Terms-Artificial transmission lines, dual-band components, metamaterials, microwave filters, open complementary split ring resonators (OCSRRs), open split rings resonators (OSRRs). I. INTRODUCTION A RTIFICIAL transmission lines based on metamaterial concepts, that is, metamaterial transmission lines, have been a subject of growing interest in recent years. Such lines are artificial structures consisting on a host propagating medium loaded with reactive elements. Special efforts have been dedicated to the synthesis of artificial lines exhibiting backward wave transmission at low frequencies and forward wave propagation at high frequencies. These composite right/left-handed lines have been implemented in microstrip [1], [2], coplanar
Left-handed metamaterial based on dual split ring resonators in microstrip technology
Proc. Int. URSI …
A new planar left-handed propagating medium consisting on a microstrip line with complementary split ring resonators (SRR) etched on the ground plane that produces a negative dielectric permitivity is presented. The necessary negative magnetic permeability is achieved by capacitive gaps periodically spaced along the strip conductor. Using EM duality theorem, it is shown that a complementary split ring resonator produces an equivalent response to that of a negative dielectric permitivity. In this way, the complete structure permits negative wave propagation in a narrow frequency band. The measured transmission coefficient in the fabricated prototype exhibits reasonable insertion losses in the pass band and high frequency selectivity. Thanks to the sub-lambda operation of the Dual-SRRs and its easy tunability, these structures are a potential candidate for the design of very compact microwave circuits based on left handedness.
On the Orientation of Complementary Split-Ring Resonators in Left-Handed Microstrip Lines
game.ftn.uns.ac.rs
Split ring resonators (SRR) and complementary split ring resonators (CSRR) are used in left-handed media to obtain negative values of permeability and permittivity, respectively. It is well known that the orientation of SRR positioned next to the microstrip transmission line, significantly influences its performances. However, it is generally accepted that such dependence does not exist in the case of CSRR. In this paper, influence of the orientation of CSRR is analyzed in detail, especially for the case of multiple CSRR geometries. To validate simulation results, left-handed microstrip lines with multiple CSRR are designed, fabricated and measured.
Microwave and Optical Technology Letters, 2007
Combining an electromagnetic band-gap structure (EBG) and squared split-ring resonators (SSRRs) in a planar microstrip line circuit, negative values of electric permittivity and magnetic permeability can be obtained. This phenomenon arises thanks to the negative permeability of the SSRR particles when they operate in the vicinity of their quasi-static resonance frequency, and the negative permittivity due to the behavior of the EBG structure within the rejected frequency band. Therefore, a novel approach is presented in this article to synthesize a left-handed media in microstrip technology. Full wave simulation results as well as measurement results from a fabricated prototype confirm the left-handed behavior of the interaction.
Left handed coplanar waveguide band pass filters based on bi-layer split ring resonators
IEEE Microwave and Wireless Components Letters, 2004
A new type of compact band pass filters based on planar structures with three metal levels is proposed. The central layer consists on a coplanar waveguide (CPW) with periodic wire connections between the central strip and ground planes. In the upper and lower metal levels, split ring resonators (SRRs) are etched and aligned with the slots. The wires make the structure to behave as a microwave plasma, with a negative effective permittivity covering a wide frequency range. SRRs, which are magnetically coupled to the CPW, provide a negative magnetic permeability in a narrow frequency range above their resonant frequency. The result is a band pass structure which supports wave propagation in a frequency interval where negative permittivity and permeability coexist. The bandwidth of the structure can be controlled by tuning the resonant frequency of the upper and lower SRRs and the distance between SRRs. Fabricated prototype devices exhibit very low insertion losses in the pass band ( 1 5 dB) and high frequency selectivity.