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Reconfigurable Delay Lines with Split-Ring Resonators  [PDF]
Radovan Bojani?,Branka Jokanovi?,Vojislav Milo?evi?
Microwave Review , 2011,
Abstract: In this paper we proposed anovel multiband delay line which consists of two types of split-ring resonators: the broadiside coupled and the single split-ring resonator. Proposeddelay line exhibits two left-handed bands that can be shifted by twisting the split rings for certain angle or by changing their lengths. This delay line is suitable for design of multiband frequency scanning antennas since can provide phase shift of 70 degrees per 100MHz of frequency shift. Reconfigurability of the proposed delay line is demonstrated with two novel configurations obtained by switching ON/OFF a PIN diode placed at the upper split-ring resonator.
Alignment and Position Sensors Based on Split Ring Resonators  [PDF]
Jordi Naqui,Miguel Durán-Sindreu,Ferran Martín
Sensors , 2012, DOI: 10.3390/s120911790
Abstract: In this paper compact alignment and position sensors based on coplanar waveguide (CPW) transmission lines loaded with split ring resonators (SRRs) are proposed. The structure consists of a folded CPW loaded with two SRRs tuned at different frequencies to detect both the lack of alignment and the two-dimensional linear displacement magnitude. Two additional resonators (also tuned at different frequencies) are used to detect the displacement direction. The working principle for this type of sensor is explained in detail, and a prototype device to illustrate the potential of the approach has been designed and fabricated.
Waveguide Model for Thick Complementary Split Ring Resonators  [PDF]
Laura Maria Pulido-Mancera,Juan Domingo Baena Doello
Physics , 2014,
Abstract: This paper presents a very simple analytical model for the design of Frequency Selective Surfaces based on Complementary Split Ring Resonators (CSRR) within the microwave range. Simple expressions are provided for the most important geometrical parameters of the model, yielding an accurate description of the CSRR resonance frequency and avoiding full-wave numerical simulations. Besides, a qualitative description of the band-pass filter behavior of these structures is described, considering its high quality factor Q.
Electric coupling to the magnetic resonance of split ring resonators  [PDF]
N. Katsarakis,T. Koschny,M. Kafesaki,E. N. Economou,C. M. Soukoulis
Physics , 2004, DOI: 10.1063/1.1695439
Abstract: We study both theoretically and experimentally the transmission properties of a lattice of split ring resonators (SRRs) for different electromagnetic (EM) field polarizations and propagation directions. We find unexpectedly that the incident electric field E couples to the magnetic resonance of the SRR when the EM waves propagate perpendicular to the SRR plane and the incident E is parallel to the gap-bearing sides of the SRR. This is manifested by a dip in the transmission spectrum. A simple analytic model is introduced to explain this interesting behavior.
Decoupling Crossover in Asymmetric Broadside Coupled Split Ring Resonators at Terahertz Frequencies  [PDF]
George R. Keiser,Andrew C. Strikwerda,Kebin Fan,Valerie Young,Xin Zhang,Richard D. Averitt
Physics , 2013, DOI: 10.1103/PhysRevB.88.024101
Abstract: We investigate the electromagnetic response of asymmetric broadside coupled split ring resonators (ABC-SRRs) as a function of the relative in-plane displacement between the two component SRRs. The asymmetry is defined as the difference in the capacitive gap widths (\Delta g) between the two resonators comprising a coupled unit. We characterize the response of ABC-SRRs both numerically and experimentally via terahertz time-domain spectroscopy. As with symmetric BC-SRRs (\Delta g=0 \mu m), a large redshift in the LC resonance is observed with increasing displacement, resulting from changes in the capacitive and inductive coupling. However, for ABC-SRRs, in-plane shifting between the two resonators by more than 0.375Lo (Lo=SRR sidelength) results in a transition to a response with two resonant modes, associated with decoupling in the ABC-SRRs. For increasing \Delta g, the decoupling transition begins at the same relative shift (0.375Lo), though with an increase in the oscillator strength of the new mode. This strongly contrasts with symmetric BC-SRRs which present only one resonance for shifts up to 0.75Lo. Since all BC-SRRs are effectively asymmetric when placed on a substrate, an understanding of ABC-SRR behavior is essential for a complete understanding of BC-SRR based metamaterials.
Nonlinear properties of split-ring resonators  [PDF]
Bingnan Wang,Jiangfeng Zhou,Thomas Koschny,Costas M. Soukoulis
Physics , 2008, DOI: 10.1364/OE.16.016058
Abstract: In this letter, the properties of split-ring resonators (SRRs) loaded with high-Q capacitors and nonlinear varactors are theoretically analyzed and experimentally measured. We demonstrate that the resonance frequency $f_m$ of the nonlinear SRRs can be tuned by increasing the incident power. $f_m$ moves to lower and higher frequencies for the SRR loaded with one varactor and two back-to-back varactors, respectively. For high incident powers, we observe bistable tunable metamaterials and hysteresis effects. Moreover, the coupling between two nonlinear SRRs is also discussed.
Terahertz Metamaterials with Semiconductor Split-Ring Resonators for Magnetostatic Tunability  [PDF]
Jiaguang Han,Akhlesh Lakhtakia,Cheng-Wei Qiu
Physics , 2008, DOI: 10.1364/OE.16.014390
Abstract: We studied a metasurface constituted as a periodic array of semiconductor split-ring resonators. The resonance frequencies of the metasurface excited by normally incident light were found to be continuously tunable in the terahertz regime through an external magnetostatic field of suitable orientation. As such metasurfaces can be assembled into 3D metamaterials, the foregoing conclusion also applies to metamaterials comprising semiconductor split-ring resonators.
Magnetic dipole moments in single and coupled split-ring resonators  [PDF]
Yong Zeng,Colm Dineen,Jerome V. Moloney
Physics , 2009, DOI: 10.1103/PhysRevB.81.075116
Abstract: We examine the role of magnetic dipoles in single and coupled pairs of metallic split-ring resonators by numerically computing their magnitude and examining their relative contributions to the scattering cross section. We demonstrate that magnetic dipoles can strongly influence the scattering cross section along particular directions. It is also found that the magnetic dipole parallel to the incident magnetic field and/or high-order multipoles may play a significant role in the linear response of coupled split-ring resonators.
Tunable split-ring resonators for nonlinear negative-index metamaterials  [PDF]
Ilya V. Shadrivov,Steven K. Morrison,Yuri S. Kivshar
Physics , 2006, DOI: 10.1364/OE.14.009344
Abstract: We study experimentally the dynamic tunability and self-induced nonlinearity of split-ring resonators incorporating variable capacitance diodes. We demonstrate that the eigenfrequencies of the resonators can be tuned over a wide frequency range, and significantly, we show that the self-induced nonlinear effects observed in the varactor-loaded split-ring resonator structures can appear at relatively low power levels.
Analysis and Application of Novel Structures Based on Split Ring Resonators and Coupled Lines
Jia-Xiao Niu;Xi-Lang Zhou;Lin-Sheng Wu
PIER , 2007, DOI: 10.2528/PIER07060101
Abstract: In this paper, novel structures using split ring resonators (SRRs) and coupled lines are proposed and analyzed. SRRs are etched on three different planes and their propagation characteristics are compared. Two compact narrow band band-pass filters based on these structures are designed and their performances are demonstrated by simulated and measured results, which are in good agreement.
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