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Ring Resonators (ring + resonator)

Distribution by Scientific Domains

Engineering	100%

Kinds of Ring Resonators

complementary split ring resonator

split ring resonator

Selected Abstracts

Microstrip dual-band bandpass filters using parallel-connected open-loop ring resonators

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2008
Lung-Hwa Hsieh
Abstract This article proposes a microstrip dual-band bandpass filter that uses parallel-connected open-loop ring resonators. Compared to many microstrip dual-band filters, the advantages of using microstrip open-loop ring resonators are easy calculation (half-guided-wavelength), easy fabrication (equal width for all 50-, lines and without grounding holes), and direct connection to external feed lines (reducing insertion loss caused by gap couplings). Another advantage of the filter is an asymmetrical feed on the ring resonator that provides sharp rejections at its adjacent bands. The input and output matches of resonators to the external feed lines are derived using a simple transmission-line theory. The results of the derivation provide a simple design rule for filter designers. Simulated and measured results are presented with good agreement. The filter has minimum insertion loss of 1.25 dB at 1.85 GHz and 1.6 dB at 2.33 GHz. The 3-dB fractional bandwidths are 5.9% for the 1.9-GHz bandpass filter and 4.7% for the 2.4-GHz bandpass filter, respectively. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008. [source]

Dark soliton generation using dual Brillouin fiber laser in a fiber optic ring resonator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
S. F. Hanim
Abstract Stable dark soliton pulses have been successfully generated in an erbium doped dispersion compensated fiber (DCF) using an enhanced dual Brillouin fiber laser (DBFL) scheme.Multidark soliton pulses generation in an S-band erbium doped depressed cladding fiber (DC-EDF) using a multiwavelength Brillouin fiber laser (MW-BFL). Configuration has also been successfully demonstrated. The hybrid amplification from the 300 mW power of Raman pump (RP), 7.7 km long DCF, and 30 m DC-EDF that is being pumped bidirectionally results in a stable multiwavelength Brillouin peaks in the S-band region. Results obtained shows that the insertion of linear gain medium with bidirectional pumping of the DC-EDF into the cavity gives significant amplification and promotes the formation of stokes peaks in the S-band region. The number of Brillouin peaks generated is closely dependent on the DBFL and MW-BFL configuration, the Brillouin pump (BP) signal wavelength, the BP coupling ratio, and the RP power. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:881,883, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25036 [source]

Compact microstrip low-pass filter using complementary split ring resonators with ultra-wide stopband and high selectivity

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010
Hui-Yong Zeng
Abstract The transmission characteristic of the microstrip with complementary split ring resonator (CSRR) is researched. Compared with the conventional structure, this filter can achieve a wider bandgap by shifting the gap of CSRR from the side of the microstrip to the underside. And then, a lower transmission zero can be realized by loading a pair of narrow slots in the gap of the ring. The equivalent circuit model of the structure is provided. By cascading CSRR cells with different transmission zeros, a ultra-wide bandgap low-pass filter (LPF), which has a cutoff frequency at 4.3 GHz is designed. The designed LPF has a high performance with an insertion loss lower than 0.3 dB in pass band, a high out-band suppression more than 20 dB (4.55,25 GHz), and a very sharp transition band about 0.25 GHz (4.3,4.55 GHz). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 430,433, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24942 [source]

A novel ultrawideband planar antenna with dual band-notched performance

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2010
Meng Zhang
Abstract In this article, a novel and compact ultrawideband (UWB) planar antenna is presented. This antenna consists of an annular patch and a 50 , microstrip feed line. The 3.5/5.5 GHz dual band-notched characteristic gets achieved by etching a C-shaped slot in the patch and complimentary split ring resonator (CSRR) structure in the ground. The measured results show that the proposed antenna can achieve the voltage standing wave ratio (VSWR) requirement of less than 2.0 in very UWB frequency range from 3.05 to 23.8 GHz with dual band-rejection performance of 3.4 to 4.0 GHz and 4.92 to 6.0 GHz. Measured VSWR of the proposed antenna is in good agreement with the simulated result. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 90,92, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24856 [source]

Dual-band-rejection filter based on split ring resonator (SRR) and complimentary SRR

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
Xin Hu
Abstract A novel concept of a compact, low insertion-loss dual-band-rejection filter (DBRF) is proposed, and its equivalent circuit model is given. The filter consists of single split ring resonators (SRRs) on the top of the host microstrip line and Complimentary SRR etched on the back ground plane. The dimensions of the structure are as small as 1.4 cm × 2 cm, while high frequency selectivity is achieved at both band edges due to the presence of two transmission zeros. The filter has an insertion loss of better than 1 dB, a return loss of larger than 10 dB in the passband from 3.3 to 4.0 GHz, and two rejections of greater than 30 dB within 2.5,2.6 and 5.2,5.6 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2519,2522, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24596 [source]

A wideband quasi-millimeter-wave bandpass filter using dual-mode resonator with 5/4 wavelength folded stubs

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2009
Peng Cai
Abstract A novel wideband quasi-millimeter-wave filter with good in-band and out-band performances is proposed in this article. A dual-mode square ring resonator loaded with two 5,0/4 (,0 is the center wavelength of the filter) folded stubs is introduced to realize a 3 dB passband bandwidth of about 15%. Because of the transmission zeros produced by the dual-mode ring resonator in the stopbands, the proposed filter exhibits sharp attenuations near the passband. On the other hand, a parallel-coupled two-mode resonator is introduced and integrated with the dual-mode ring resonator to get a further improvement of the out-band performance with wide stopbands. The fabricated filter has an insertion loss better than 2 dB in the passband and rejections greater than 20 dB at most of the frequencies in the stopbands. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1708,1711, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24457 [source]

Compact dual-band multilayer antenna element for nonlinear junction detector application

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
Krzysztof Wincza
Abstract A compact dual-band antenna element for application in a nonlinear junction detector is proposed. To achieve broadband characteristics in two separate frequency ranges a stratified structure is proposed in which two driven and two parasitic patches are properly placed. For transmitting, a circularly polarized antenna is used in which stacked square ring resonators are applied to achieve simultaneously broadband operation and compact size. For receiving, a dual-polarized antenna is proposed in which a square patch is loaded by a square ring resonator to provide wide band and to allow for integration with the transmitting antenna. Theoretical calculations confirmed by measurement results are presented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 696,699, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24136 [source]

Design of the wideband dual-mode bandpass filter using stepped impedance resonators

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2008
Cheng-Yuan Hung
Abstract In this letter, a novel dual-mode bandpass filter (BPF) using stepped impedance resonators (SIRs) for simultaneous low insertion-loss and wide passband has been designed. This novel wideband dual-mode BPF is formed by a microstrip square ring resonator with direct-connected orthogonal feed lines, and two impedance steps as perturbations. By varying the impedance ratio (K) of the SIRs, the wideband bandwidth can be tuned with more freedoms. The design procedure using the analysis of even and odd mode is described in this paper. The wideband BPF with relative bandwidth of 76.5% is simulated using the full wave electromagnetic simulation, and then fabricated and measured using the network analyzer. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1104,1107, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23281 [source]

Analytical model for double split ring resonators with arbitrary ring width

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008
Vitaliy Zhurbenko
Abstract For the first time, the analytical model for a double split ring resonator with unequal width rings is developed. The proposed models for the resonators with equal and unequal widths are based on an impedance matrix representation and provide the prediction of performance in a wide frequency range. A phase compensation is implemented to adjust for the difference in length of the two rings, resulting in an accurate calculation of the resonant frequencies. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 511,515, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23104 [source]

Compact sharp cutoff wide stopband microstrip low-pass filter using complementary split ring resonator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2007
Santanu Dwari
Abstract A novel compact microstrip low-pass filter (LPF) is proposed using open circuit stubs and square patches alongwith complementary split ring resonator (CSRR). It exhibits wide stopband and sharp rejection. A demonstration LPF, having 3-dB cutoff frequency of 1.45 GHz, was fabricated and measured. Measured passband to stopband attenuation slope is more than 355 dB/GHz. Measured rejection greater than 20 dB extends over more than 13.75 times of the 3-dB cutoff frequency. Electrical length of the filter is less than 12% of the guided wavelength at 3-dB cutoff frequency. Experimental and simulated results agree well. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2865,2867, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22825 [source]

CPW-fed dual-mode double-ring resonators with Butterworth approximations for band-pass filter applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2007
Ji-Chyun Liu
Abstract The CPW-fed configurations of dual-mode ring resonator (DMRR) are introduced to improve the performance of the dual-mode double ring resonator (DMDRR). To obtain low insertion loss (1.65 dB at TM110 mode and 0.91 dB at TM210 mode) and high out-of-band rejection level (,51.95 dB) and wider band (BW 13.09% at TM110 and 16.14% at TM210 mode) filters, using voltage-couples and dual-mode perturbations are proposed here. Simulation results including surface current distributions and frequency responses are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1217,1221, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22397 [source]

Electromagnetically coupled microstrip square ring resonator: Inset/offset feed variation effects on resonance frequency

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2006
H. Ghanbari
Abstract Inset/offset feed dependant variation of electromagnetically coupled (EMC) microstrip square ring resonator (MSRR) indicates overall increase in resonance frequency (fy). Based on experimental results an equation is suggested to determine fy. Very high values of quality factor (Q = 618) are obtained at two offset points near the ring edge, with VSWR , 1. This advantage of EMC-MSRR could be used for applications such as frequency-selective circuits and sensors. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1922,1924, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21815 [source]

Microstrip dual-band bandpass filters using parallel-connected open-loop ring resonators

Miniaturized rectangular waveguide filters

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2007
Alexander Shelkovnikov
Abstract Two types of miniaturized rectangular waveguide filters are presented. Miniaturization is achieved using the slow-wave effect of electromagnetic bandgap (EBG) surfaces and the left-handed properties of split ring resonators (SRRs). The proposed EBG waveguide bandpass filter performs passband in the frequency range, which corresponds to the waveguide with the lower recommended operating band consequently enabling significant miniaturization of the structure. The SRR-loaded bandstop filter makes use of the effect imposed by left-handed medium (LHM), which is created by a combination of SRRs and wireline on the dielectric slab. Both filters are designed, simulated, and tested. Experimental results of the SRR-loaded bandstop filter are presented to demonstrate feasibility of the proposed structures. © 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007. [source]

Compact microstrip low-pass filter using complementary split ring resonators with ultra-wide stopband and high selectivity

Dual-band-rejection filter based on split ring resonator (SRR) and complimentary SRR

Composite right/left-handed transmission line based on Koch fractal shape slot in the ground and UWB filter application

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2009
Jian An
Abstract A novel composite right/left-handed transmission line is presented which is synthesized by etching Koch fractal shape slot in the ground plane and series capacitive gap in the conductor strip. Unlike the structures loaded with complementary split ring resonators, the proposed structure can operate at very wideband and is used to design an ultra-wideband (UWB) filter. The UWB filter is fabricated and tested. The relative bandwidth of the ,10 dB return loss is 128% and the insertion loss is larger than ,1.5 dB except at high frequencies. The equivalent circuit model of the proposed structure is presented and the electrical parameters are also extracted. The circuit model results are compared with the simulation and measurement results which verify that not only the extracted parameters are exact but also the equivalent circuit model is reasonable. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2160,2163, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24553 [source]

Metamaterial transmission lines with tunable phase and characteristic impedance based on complementary split ring resonators

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2009
Adolfo Vélez
Abstract In this article, resonant-type tunable metamaterial transmission lines with independent control over the electrical parameters of the line, that is, the electrical length and characteristic impedance, are presented for the first time. Tuning is achieved by loading a host microstrip line with varactor-loaded complementary split ring resonators (VLCSRRs) and varactor diodes. By locating the varactor diodes in series configuration with the line, outside the region occupied by the VLCSRRs, it is possible to control the characteristic impedance and the electrical length (phase shift), over a wide band. As an illustrative example, a tunable 35 ,/90° line functional between 0.4 and 0.8 GHz (which represents more than 65% tuning range), is presented and applied to the design of a transmission line power divider. The device is small and it exhibits reasonable performance. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1966,1970, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24480 [source]

Dual band-notched ultra-wideband antenna with codirectional SRR

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009
Wentao Wang
Abstract In this article, a rectangular monopole ultra-wideband antenna with dual band-notched characteristic is proposed. The bandstop characteristic is produced by a new configuration of split ring resonators (SRRs). Being different from the conventional reverse split rings, this novel structure consists of two codirectional split rings and locates in the both sides of the rectangular radiating patch. Furthermore, the length of each ring controls the corresponding resonant frequency. By adjusting the dimension of the codirectional SRRs, the band-rejected frequencies from 3.25 to 3.75 GHz and from 5.15 to 5.6 GHz can be achieved easily. These rejected bands cover the operating bands, which have been applied to WiMAX and WLAN. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1032,1034, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24255 [source]

Compact dual-band multilayer antenna element for nonlinear junction detector application

Parametric analysis of microstrip lines loaded with complementary split ring resonators

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2008
Jordi Bonache
Abstract In this article, the effects of varying the geometry of complementary split ring resonators (CSRRs) in microstrip lines loaded with such resonant elements is analyzed. Specifically, from a parameter extraction technique previously proposed by some of the authors, the electrical parameters of CSRR-loaded lines (namely, the line inductance, the inductance and capacitance of the CSRR, and the coupling capacitance between the line and the CSRRs), are inferred. This analysis is of interest because, in spite of the existence of analytical models that predict the electrical parameters of these CSRR-loaded lines, the validity of these models is limited, and the parameter extraction method is necessary to accurately determine the electrical parameters from geometry. From the analysis carried out in this work, interesting conclusions for the design of CSRR-loaded lines are obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2093,2096, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23571 [source]

Planar broadband millimeter-wave antenna based on open loop ring resonators

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008
Guo-Min Yang
Abstract A compact planar broadband millimeter-wave antenna is presented in this article. The proposed millimeter-wave (MM-W) antenna is realized by connecting two pairs of open loop ring resonators (OLRRs). A tapered transmission line is adopted to improve the return loss performance in the required band. Combining these two structures, a new broadband MM-W antenna is obtained. The measured results show that the proposed MM-W antenna has a wide bandwidth from 26 to 40 GHz, and all the return losses are less than ,15 dB in this band combined with excellent radiation characteristics. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 324,328, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23081 [source]

Analytical model for double split ring resonators with arbitrary ring width

UMTS diplexer design using dual-mode ring resonators

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007
Min-Hua Ho
Abstract In this letter, we propose a novel design of a UMTS diplexer using dual-mode rectangular ring-resonators. The diplexer is composed of two rectangular rings, which termed as the Tx- and Rx-ring, with each ring its input and output ports separated from each other by a quarter-wavelength to create the degenerate-mode resonance. The ratio of the long- and short-side dimension of rectangular ring can be used to fine tune the passband's bandwidth and the ratio is properly chosen to achieve sufficient bandwidth required by the UMTS diplexer applications. An enhanced parallel-coupled structure is introduced in the circuit to replace the conventional end-gap coupling for reducing the insertion losses in the passband. The effect of the coupling-line length is also simulated and the resulting data are used to precisely tune the positions of the zeros. In the zero assignment, one of the zeros possessed by each ring filter is managed to be implanted in the passband of its counterpart filter for increasing the isolation between the Rx- and Tx-port. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 63,65, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22030 [source]

Investigation into microstrip dual-mode bandpass filters (BPFS) with in-line feed-line configurations

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2006
JiaLin Li
Abstract Based on the geometry relationship of the conventional dual-mode ring resonators, this study concisely describes the operation principle of a kind of dual-mode resonator filters with in-line feed-lines. The investigated filter topology is fed by two pairs of orthogonal branch lines and can realize in-line configuration for the input and output (I/O) ports, which is useful in many practical applications. Meanwhile, the influences of feed-lines on transmission-zeros (TZs) are, for the first time, investigated to guide the design of this kind of filters. Several demonstrators are designed and examined, and good results are obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2008,2013, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21845 [source]

Resonant frequencies of a combination of split rings: Experimental, analytical and numerical study

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2005
A. Radkovskaya
Abstract The resonant frequencies of five different ring resonators are measured with the aid of a network analyser within the frequency range of about 1.5 to 2.8 GHz. The resonant frequencies for those configurations are also determined from numerical calculations using the commercially available MICRO-STRIPES package. The experimental and numerical results are shown to be very close to each other. Analytical results from various authors, available for three of the configurations, are also compared with the experimental results; one of them leads to a large discrepancy, but the other analytical approximations are shown to be not too far off. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 473,476, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21021 [source]

On the transmission properties of left-handed microstrip lines implemented by complementary split rings resonators

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 2 2006
M. Gil
Abstract In this paper, the transmission properties of left-handed microstrip lines implemented by etching complementary split rings resonators (CSRRs) and capacitive gaps in the ground plane and conductor strip, respectively, are investigated. To this end, we make use of the lumped element equivalent circuit model of the structure, from which an accurate analysis is carried out, and the influence of the main electrical parameters on the transmission properties is pointed out through electrical simulations. Aspects such as bandwidth and in-band ripple control are discussed in detail. The influence of the geometrical parameters is also discussed and interpreted to the light of the equivalent circuit model. From the results obtained, there are inferred design guidelines that are suitable for the design of metamaterial transmission lines subjected to specifications. Copyright © 2006 John Wiley & Sons, Ltd. [source]

A novel bandpass filter based on complementary split rings resonators and substrate integrated waveguide

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2008
Wenquan Che
Abstract One novel bandpass filter implemented with combination of two different structures-complementary split rings resonators (CSRRs) and substrate integrated waveguide (SIW) is proposed in this article. Several CSRRs are etched on the surface of SIW to form the stopband with very sharp rejection. One prototype was fabricated, the measured results indicate 30% passband (at ,15 dB return loss), the rejection band ranges from 6.4 GHz to 7.8 GHz, about 20% bandwidth at ,20 dB rejection, the maximum rejection even reaches 50 dB. The rejection skirt is very sharp, only 18 MHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 699,701, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23182 [source]