Rectangular Split Ring Resonator Research Articles

Transmission line model for coupled rectangular double split-ring resonators

In this work, a model based on a coupled transmission line formulation is developed for microstrip rectangular double split-ring resonators (DSRRs). This model allows using the physical dimensions of the DSRRs as an input avoiding commonly used extraction of equivalent parameters. The model includes the compensation for the different circumference of two rings and allows the prediction of higher order resonance modes of the DSRR. The advantage of the developed model in comparison to the previously developed analytical representation is that it includes the coupling effect between neighboring DSRRs, which allows for an accurate modeling of densely packed multiresonator structures. The model is verified by comparison with measured DSRRs-loaded microstrip line performance. The developed model can be effectively used to save computation resources associated with full wave electromagnetic simulations of the DSRR structures. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1311–1315, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25988

Enhanced gain dual band patch antenna based on complementary rectangular split-ring resonators

A simple and successful dual band patch vertical polarized rectangular antenna design is presented. The dual band antenna is designed etching a complementary rectangular split ring resonator in the patch of a conventional rectangular patch antenna. Furthermore, a miniaturization of the conventional rectangular patch antenna and an enhancement of the complementary split ring resonator resonance gain are achieved. The dual band antenna design has been made feasible due to the quasi-static resonance property of the complementary split ring resonators. The simulated results are compared with measured data and good agreement is reported. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:590–594, 2011; View this article at wileyonlinelibrary.com. DOI 10.1002/mop.25797

Implementation and investigation of a dual-frequency antenna

The planar rectangular split-ring resonator is applied to design the printed dipole antenna with a requirement of dual frequency in this letter.A dual-frequency antenna example is given, which works at 1.7 and 4.0 GHz. Any pair of working frequencies can be obtained by the presented technique. The antenna is simulated and fabricated. Its radiation characteristics including impedance bandwidth, radiation patterns, and gain are simulated, measured, and compared. The presented antenna has attractively good performances that the radiation patterns at dual frequencies are both dipolar. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2765–2767, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25583

A Study on the Novel Rectangular Split Ring Notch Resonators

In this paper, a novel notch resonator is proposed based on Rectangular Split Ring Resonator (RRSS) element. We represented the electrical characteristics for R-SRR elements coupled with microstrip line, and measured result is compared with electromagnetic simulation (HFSS) result. We also solved equivalent circuit for R-SRR element, and also discussed influences of change structural parameters of R-SRR. The size of R-SRR is the most important parameters for frequency tuning. Also we can make tunable resonator form the basic structure. This novel resonator can apply to design of tunable bandpass filter and voltage control oscillator.

MICROSTRIP ANTENNA'S GAIN ENHANCEMENT USING LEFT-HANDED METAMATERIAL STRUCTURE

The design, simulation and fabrication of a left-handed metamaterial (LHM) structure is presented. The combination of the modifled square rectangular Split Ring Resonator (SRR) and the Capacitance Loaded Strip (CLS) were used to obtain the negative value of permeability, and the negative permittivity, . Nicolson- Ross-Wier approach was used to identify the double negative region. A good agreement between simulated and measured results has been achieved. Upon incorporation with a single patch microstrip antenna, the performance of the antenna was improved where the gain of the microstrip antenna was increased up to 4dB, and its bandwidth widens from 2.9% to 4.98%. These improvements are due to the negative refraction characteristics of the LHM structure that acts as a lens when placed in front of the antenna.

Design of the Ultra-Wideband Antenna with 5.2 GHz/5.8 GHz Band Rejection Using Rectangular Split-Ring Resonators (SRRS) Loading

This paper presents the design and fabrication of a band rejection ultra-wideband (UWB) antenna integrated with rectangular split-ring resonators (SRRs) etched on both sides of the circular radiating patch. The proposed band rejection UWB antenna has the impedance bandwidth of about 3.1 ∼ 11.7 GHz within VSWR ≤ 2 and a notched frequency band of about 5.1 ∼ 5.9 GHz. The proposed antenna is fed by the CPW line, and it is a monopole type with SRR rejecting 5.15 ∼ 5.825 GHz band limited by the WLAN (IEEE802.11a/n).

Characterization and analysis of terahertz metamaterials based on rectangular split-ring resonators

We present the experimental characterization of planar terahertz metamaterials based on rectangular electric split-ring resonator designs. Comparisons to square-ring designs reveal that rectangular shapes greatly affect the overall metamaterial response by altering the spectral separation and coupling between multiple ring resonances. A simple model is used to help us understand this coupling behavior and the extent of its effects. Advantages and disadvantages of these unconventional ring designs are discussed in terms of possible applications.

Magnetic response of split ring resonators at terahertz frequencies

AbstractWe investigate numerically the electric and the magnetic response of the split‐ring resonators (SRRs) for different electromagnetic (EM) field polarization and propagation directions. We have studied the current density J of circular and rectangular SRRs at THz frequencies. At low frequencies, J is confined to the edges of the SRRs, while at high frequencies J is all over the width of the wire. The diamagnetic response of the SRRs is also examined. Finally, the role of losses and the magnetic resonance frequency are studied as the size of the SRRs becomes less than 100 nm. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Comparison of electromagnetic band gap and split-ring resonator microstrip lines as stop band structures

In this paper, microstrip lines magnetically coupled to split-ring resonators (SRRs) are compared to electromagnetic bandgap (EBG) microstrip lines in terms of their stop-band performance and dimensions. In both types of transmission lines, signal propagation is inhibited in a certain frequency band. For EBG microstrip lines, the central frequency of such a forbidden band is determined by the period of the structure, whereas in SRR-based microstrip lines the position of the frequency gap depends on the quasi-static resonant frequency of the rings. The main relevant contribution of this paper is to provide a tuning procedure to control the gap width in SRR microstrip lines, and to show that by using SRRs, device dimensions are much smaller than those required by EBGs in order to obtain similar stop-band performance. This has been demonstrated by full-wave electromagnetic simulations and experimentally verified from the characterization of two fabricated microstrip lines: one with rectangular SRRs etched on the upper substrate side, and the other with a periodic perturbation of strip width. For similar rejection and 1-GHz gap width centered at 4.5 GHz, it has been found that the SRR microstrip line is five times shorter. In addition, no ripple is appreciable in the allowed band for the SRR-based structure, whereas due to dispersion, certain mismatch is expected in the EBG prototype. Due to the high-frequency selectivity, controllable gap width, and small dimensions, it is believed that SRR coupled to planar transmission lines can have an actual impact on the design of stop-band filters compatible with planar technology, and can be an alternative to present solutions based on distributed approaches or EBG. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 376–379, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20640