Home  About us  Contact
 

Resonators

Distribution by Scientific Domains
Engineering81%
Physics and Astronomy9%
Polymers and Materials Science3%
3 Other Domains7%

Kinds of Resonators

  • cavity resonator
  • complementary split ring resonator
    		•
  • dielectric resonator
  • impedance resonator
    		•
  • ring resonator
  • split ring resonator
    		•
  • stepped-impedance resonator

    • Terms modified by Resonators

  • resonator structure
    		•

    Selected Abstracts

    Einzelne Atome im optischen Resonator

    PHYSIK IN UNSERER ZEIT (PHIUZ), Issue 1 2006
    Axel Kuhn
    Die kontrollierte Kopplung von einzelnen Atomen und Photonen gewinnt zunehmend an Bedeutung. Garchinger Forschern ist es jetzt gelungen, ein Atom in einem winzigen Resonator mehr als 15 Sekunden lang so zu platzieren, dass es auf ein einziges darin zirkulierendes Photon reagieren kann. Außerdem konnten sie das Atom in einem Laserfeld mit einer Genauigkeit von 135 nm verschieben. [source]

    Adhesive-Bonded Ca(Mg1/3Nb2/3)O3/Ba(Zn1/3Nb2/3)O3 Layered Dielectric Resonators with Tunable Temperature Coefficient of Resonant Frequency

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 10 2006
    Lei Li
    No abstract is available for this article. [source]

    Microwave Dielectric Ceramics for Resonators and Filters in Mobile Phone Networks

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 7 2006
    Ian M. Reaney
    Temperature-stable, medium-permittivity dielectric ceramics have been used as resonators in filters for microwave (MW) communications for several decades. The growth of the mobile phone market in the 1990s led to extensive research and development in this area. The main driving forces were the greater utilization of available bandwidth, that necessitates extremely low dielectric loss (high-quality factor), an increase in permittivity so that smaller components could be fabricated, and, as ever in the commercial world, cost reduction. Over the last decade, a clear picture has emerged of the principal factors, that influence MW properties. This article reviews these basic principles and gives examples of where they have been used to control microwave properties and ultimately develop new materials. [source]

    Multiplexed Detection and Label-Free Quantitation of MicroRNAs Using Arrays of Silicon Photonic Microring Resonators,

    ANGEWANDTE CHEMIE, Issue 27 2010
    Abraham
    Mikroringe für MikroRNAs! Eine markierungsfreie Methode für den empfindlichen Nachweis von MikroRNAs nutzt Anordnungen aus photonischen Silicium-Mikroringresonatoren. Diese einfache und modular zu vervielfachende Methode zum direkten Charakterisieren von MikroRNA binnen 10,min löst einige der Probleme von derzeit üblichen Verfahren. [source]

    Statistische Untersuchung der Bewegung eines Resonators in einem Strahlungsfeld [AdP 33, 1105 (1910)]

    ANNALEN DER PHYSIK, Issue S1 2005
    A. Einstein
    First page of article [source]

    Microwave Breakdown Field in a Resonant Spherical Cavity

    CONTRIBUTIONS TO PLASMA PHYSICS, Issue 4 2006
    R. Tomala
    Abstract In the present work, the microwave breakdown threshold in a gas-filled spherical resonator, is determined for the case when the cavity is excited in its lowest order mode, which implies that the microwave field strength depends on both radius and azimuthal angle. A semi-analytical approximation of the breakdown threshold is found using a direct variational approach. The variational predictions are compared with the results of full numerical calculations and demonstrate very good agreement [source]

    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]

    New approach for the analysis and design of negative-resistance oscillators: Application to a quasi-MMIC VCO

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2006
    Jeffrey Chuan
    Abstract This article proposes a new approach for the analysis and design of negative-resistance oscillators using computer-aided engineering tools. The method presented does not require any special probe and makes the oscillator design similar to the methodology applied to amplifiers. It speeds up convergence and avoids uncertainties in the solution. The negative-resistance oscillator is split into two parts: an active-amplifying part and a resonator part. A chain is constructed by linking both parts and repeating them several times, which is known as the repeated circuit simulation procedure. This method allows the separation of the signal flowing between them. Small-signal AC-sweep and harmonic-balance techniques, both available in several commercial software packages, are applied. This method is theoretically justified and shows convergence with less iteration. Furthermore, it is more robust than standard harmonic-balance probes in the case of multiple frequencies of oscillation. It has been demonstrated in the design of a quasi-MMIC VCO. This VCO has an external resonator circuit (coaxial resonator and varactor) and a MMIC negative-resistance circuit, which was manufactured using ED02AH p-HEMT technology (OMMIC). © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source]

    Artificial neural network modeling of RF MEMS resonators

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2004
    Yongjae Lee
    Abstract In this article, a novel and efficient approach for modeling radio-frequency microelectromechanical system (RF MEMS) resonators by using artificial neural network (ANN) modeling is presented. In the proposed methodology, the relationship between physical-input parameters and corresponding electrical-output parameters is obtained by combined circuit/full-wave/ANN modeling. More specifically, in order to predict the electrical responses from a resonator, an analytical representation of the electrical equivalent-network model (EENM) is developed from the well-known electromechanical analogs. Then, the reduced-order, nonlinear, dynamic macromodels from 3D finite-element method (FEM) simulations are generated to provide training, validating, and testing datasets for the ANN model. The developed ANN model provides an accurate prediction of an electrical response for various sets of driving parameters and it is suitable for integration with an RF/microwave circuit simulator. Although the proposed approach is demonstrated on a clamped-clamped (C-C) beam resonator, it can be readily adapted for the analysis of other micromechanical resonators. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14: 302,316, 2004. [source]

    Low-spurious-response coaxial-line BPF with saucer-loaded stepped-impedance resonators designed with mode-matching technique

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2004
    Hiromitsu Uchida
    Abstract A novel stepped-impedance resonator with a thin metal saucer is proposed in order to reduce spurious-response levels in a coaxial-line bandpass filter (BPF). In designing the BPF, the mode-matching technique is employed for fast and accurate calculation of coaxial-line discontinuities. A prototype BPF obtains a spurious-response level of less than ,55 dB in the frequency band from 2f0 to 9f0, where f0 is the pass-band center frequency. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14: 227,235, 2004. [source]

    Rotationally symmetric FDTD for wideband performance prediction of TM01 DR filters

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2002
    Andrew R. Weily
    Abstract The generalized perfectly matched layer (GPML) coupled with rotationally symmetric (RS)-FDTD method has been utilized to extract the S-parameters for several probe-coupled TM01 dielectric resonator (DR) filters to directly obtain the theoretical wideband spurious performance. The computationally efficient (RS)-FDTD method has also been used to obtain accurate filter parameters for TE01 and TM01 dielectric resonators loaded in cylindrical cavities. The RS-FDTD method combined with digital filtering and the Matrix Pencil technique are used to analyze the resonant frequencies, inter-resonator coupling, and external Q values. When perturbation theory is used with RS-FDTD, accurate values of unloaded Q are obtained. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12: 259,271, 2002. [source]

    Separation of fatty acids from binary melts using physical vapour deposition (PVD)

    JOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 3 2009
    Young Han Kim
    Abstract BACKGROUND: The use of fatty acid mixtures, natural biochemical compounds, will be extended to various chemical industries for the production of a wide variety of products, and various mixtures of fatty acids are necessary for production. Separation of a binary fatty acid mixture of lauric acid and myristic acid using physical vapour deposition (PVD) on a cold quartz crystal resonator is examined. The extremely small amount of deposits can be measured with the quartz crystal resonator. The vapour phase is prepared by vaporizing a calculated composition of melt according to the vapour-liquid equilibrium (VLE). RESULTS: The composition of lauric acid in the melt and the melt temperature were utilized as operating variables in the PVD. The growth rate of deposit increases when melt temperature and the composition of lauric acid in the melt are increased. The composition of lauric acid in the deposit is significantly lower than that of the melt of 19% lauric acid, but the composition of lauric acid in the deposit is much higher than that of the melts of 50% and 75% lauric acid. CONCLUSION: The distribution coefficient of lauric acid between solid and vapour phases can be correlated as a function of the growth rate of deposit. The possibility of separation of fatty acid mixtures by PVD is suggested experimentally and theoretically. Copyright © 2008 Society of Chemical Industry [source]

    Performance comparison of slow-light coupled-resonator optical gyroscopes

    LASER & PHOTONICS REVIEWS, Issue 5 2009
    M. Terrel
    Abstract We investigate the connection between group velocity and rotation sensitivity in a number of resonant gyroscope designs. Two key comparisons are made. First, we compare two conventional sensors, namely a resonant fiber optic gyroscope (RFOG) and an interferometric fiber optic gyroscope (FOG). Second, we compare the RFOG to several recently proposed coupled-resonator optical waveguide (CROW) gyroscopes. We show that the relationship between loss and maximum rotation sensitivity is the same for both conventional and CROW gyroscopes. Thus, coupling multiple resonators together cannot enhance rotation sensitivity. While CROW gyroscopes offer the potential for large group indices, this increase of group index does not provide a corresponding increase in the maximum sensitivity to rotation. For a given footprint and a given total loss, the highest sensitivity is shown to be achieved either in a conventional RFOG utilizing a single resonator, or a conventional FOG. [source]

    A linear cavity Brillouin fiber laser with multiple wavelengths output

    LASER PHYSICS LETTERS, Issue 5 2008
    M.R. Shirazi
    Abstract A linear cavity Brillouin fiber laser (BFL) is proposed and demonstrated for multi-wavelength operation. The BFL uses a single mode fiber (SMF) as a non-linear gain medium and an optical circulator to generate a linear cavity resonator. Two couplers are used to inject the Brillouin Pump (BP) and tap the BFL output respectively. The effect of the coupler ratio on the BFL performance is studied by keeping constant the ratio of the first coupler and varying the ratio of the second coupler. 11 simultaneous lines with a line spacing of 0.8 nm are obtained at a BP of 11.7 dBm and a coupler ratio of 95:5. The laser output is stable at room temperature with 5 lines obtained at above , 30 dBm, and has the largest signal to noise ratio observed at the remaining lines. The proposed BFL has the advantage of being able to operate at any wavelength and is only dependent on the available BP wavelength. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

    Actively Q-switched, diode pumped thulium laser

    LASER PHYSICS LETTERS, Issue 12 2007
    J.K. Jabczynski
    Abstract 6 W of output power and near 50% slope efficiency with respect to absorbed pump power was demonstrated in freerunning mode for a short, 40-mm long resonator. The uncoated, with 3.5% dopant of thulium YLF rod of.3× 8 mm size wrapped with indium foil was mounted in copper heat-sink maintaining 293 K temperature of coolant water and inserted in a short, 40-mm long resonator. For pumping the fiber coupled (0.4 mm core diameter) laser diode bar at 792-nm wavelength was deployed. The fused silica acousto-optic modulator with above 80% diffraction efficiency for 25-W power of RF was taken as the Q-switch for such a laser. In the best case of Qswitching mode up to 2-mJ output energy with 20-ns pulse duration corresponding to 100-kW peak power was demonstrated for rep. rate of a few Hz. Emission wavelength was around 1904 nm for both free-running and Q-switching regimes. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

    Hybrid mode-locked, diode-pumped Nd:Gd0.7Y0.3VO4 laser

    LASER PHYSICS LETTERS, Issue 9 2007
    A.A. Sirotkin
    Abstract A Nd:Gd0.7Y0.3VO4 crystal is grown in laser quality. The crystal is diode-pumped at 808 nm. When operated in a Z-shaped resonator with an acousto-optical modulator in combination with a Kerr lens, it produces pulses of 1.7 ps at 140 MHz repetition rate. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

    MR assessment of changes of tumor in response to hyperbaric oxygen treatment,

    MAGNETIC RESONANCE IN MEDICINE, Issue 2 2006
    Ken-ichiro Matsumoto
    Abstract Enhancement of image intensity, using the T1 -weighted spoiled gradient-echo (SPGR) sequence, was measured in SCC tumor implanted in the flank of C3H mice while they were subjected to several types of oxygenation challenges inside a hyperbaric chamber designed and constructed to fit in an MRI resonator. The central portions of the tumor gave a positive enhancement, while the periphery showed signal reduction during both normobaric (NBO) and hyperbaric (HBO) oxygen challenges. In the contralateral normal leg, nearly 70% of the region showed a decrease in intensity, and the rest showed a positive enhancement. The positive signal enhancement was markedly greater under HBO compared to NBO. Calculated R1, R2, and M0 maps from multivariate fitting of images acquired by a multislice multiecho (MSME) sequence with variable TR before, during, and after HBO treatment confirm that the source of SPGR signal enhancement in the tumor is associated with shortening of T1. Magn Reson Med, 2006. Published 2006 Wiley-Liss, Inc. [source]

    EPR oximetry in the beating heart: Myocardial oxygen consumption rate as an index of postischemic recovery

    MAGNETIC RESONANCE IN MEDICINE, Issue 4 2004
    Govindasamy Ilangovan
    Abstract Oxygen plays a critical role in the pathophysiology of myocardial injury during both ischemia and subsequent reperfusion (I/R). Thus, oxygen concentration is an important variable to measure during I/R. In the present work, electron paramagnetic resonance (EPR)-based oximetry was used to measure the oxygen concentration during a series of I/R episodes and oxygenation levels were correlated with the contractile and hemodynamic functions of the heart. A custom-developed electronically tunable surface coil resonator working at 1.1 GHz was used to determine tissue pO2 in the beating heart. Microcrystalline particulate of lithium phthalocyanine was used as an EPR oximetry probe. Isolated and perfused rat hearts were subjected to 1 or 3 hr durations of preischemic perfusion, followed by 15-min I/R cycles. In hearts perfused for 3 hr prior to 15-min I/R cycles, the myocardial pO2 decreased gradually on subsequent reperfusions of three successive I/R cycles. However, in hearts perfused for 1 hr there was almost 100% recovery of myocardial pO2 in all three I/R cycles. The extent of oxygenation recovered in each reperfusion cycle correlated with the recovery of hemodynamic and contractile function. The results also showed that the oxygen consumption rate of the heart at the end of each I/R episode decreased in direct proportion to the functional recovery. In summary, it was observed that the amount of myocardial oxygen consumption during I/R could provide a reliable index of functional impairment in the heart. Magn Reson Med 51:835,842, 2004. © 2004 Wiley-Liss, Inc. [source]

    Functional perfusion imaging using continuous arterial spin labeling with separate labeling and imaging coils at 3 T

    MAGNETIC RESONANCE IN MEDICINE, Issue 5 2003
    Toralf Mildner
    Abstract Functional perfusion imaging with a separate labeling coil located above the common carotid artery was demonstrated in human volunteers at 3 T. A helmet resonator and a spin-echo echo-planar imaging (EPI) sequence were used for imaging, and a circular surface coil of 6 cm i.d. was employed for labeling. The subjects performed a finger-tapping task. Signal differences between the condition of finger tapping and the resting state were between ,0.5% and ,1.1 % among the subjects. The imaging protocol included a long post-label delay (PLD) to reduce transit time effects. Labeling was applied for all repetitions of the functional run to reduce the sampling interval. Magn Reson Med 49:791,795, 2003. © 2003 Wiley-Liss, Inc. [source]

    Erratum: Single-shot all-optical sampling oscilloscope using a polarization-maintaining resonator for pulse replication

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010
    j Komanec
    Originally published Microwave Opt Technol Lett 52: 2452,2456, 2010. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2853, 2010; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/mop.25620 (Original article DOI 10.1002/mop.25509) [source]

    X-band low phase noise in-phase and out-of-phase injection-locked push,push DRO

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2010
    Zhou Cao
    Abstract An X-band push,push dielectric resonator (DR) oscillator with injection locking capability has been developed. Two injection locking methods, i.e., the in-phase method and the out-of-phase method, are studied. It is found that the out-of-phase method has wider locking range and much less effects on fundamental suppression than that of the in-phase method. The oscillator generates an output power of 9.5 dBm at 12.4 GHz and has a fundamental suppression of 32.5 dBc. Despite using a high quality (Q) factor DR, wide locking range has been obtained. SiGe HBTs with good flicker noise performance were chosen for low phase noise design. The phase noise values of the free running oscillator are ,104.4 dBc/Hz, ,120.2 dBc/Hz, and ,142.6 dBc/Hz at 10 kHz, 100 kHz, and 1 MHz offsets from the carrier frequency, respectively. The phase noise performance is superior or comparable to the reported designs. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2448,2452, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25510 [source]

    Single-shot all-optical sampling oscilloscope using a polarization-maintaining resonator for pulse replication

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2010
    j Komanec
    Abstract An all-optical single-shot sampling oscilloscope with a picosecond resolution is developed. An innovative approach for data pulse replication using a polarization-maintaining resonator is used. Pulses are sampled in a highly nonlinear fiber. Acquired data are used for pulse shape reconstruction. Proposed setup eliminates the need of a delay line. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2452,2456, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25509 [source]

    Compact ultra-wideband bandpass filter using defected ground structures

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2010
    J. K. Lee
    Abstract In this letter, a compact ultra-wideband (UWB) bandpass filter (BPF) is presented with improved upper stopband performance using six defected ground structures (DGS). The proposed BPF is composed of seven DGSs which are positioned under the input and output microstrip line and coupled double step impedance resonator (CDSIR). By using CDSIR and open loop defected ground structure (OLDGS), we can achieve UWB BPF characteristics, and by using the conventional DGSs under input and output microstrip line, we can improve upper stopband performance. Simulated and measured results are found in good agreement with each other, showing a wide passband from 3.4 to 10.9 GHz, minimum insertion loss of 0.61 dB at 7.02 GHz and the group delay variation is less than 0.4 ns in the operating band while wide upper stopband with more than 30 dB attenuation up to 20 GHz. In addition, the proposed UWB BPF has a compact size. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2173,2175, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25436 [source]

    Wideband spurious suppression of dual-mode band-pass filter using defected cascaded resonators

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2010
    Hung-Wei Wu
    Abstract This article presents a new design of wideband spurious suppression of dual-mode band-pass filter (BPF) using defected cascaded resonators (DCRs). The pattern of the DCRs is similar with that of the conventional low-pass stepped impedance resonator, whereas it is etched in the ground. It is verified that adding DCRs in planar BPF can effectively provide a very wideband range for spurious suppression. The dual-mode BPF is designed at center frequency (f0) of 5.2 GHz, and has a very wideband spurious suppression below 30 dB as far as over 5f0 when using the DCRs. The measured results have a good agreement with the EM simulated results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1694,1697, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25332 [source]

    High-performance UWB filter with a controllable notched band

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2010
    Chun-Ping Chen
    Abstract This article presents a design of a high-performance ultra-wideband (UWB) bandpass filter with a controllable notched band. Firstly, a UWB filter consisting of a stepped-impedance resonator (SIR) and two shunt short-circuited stubs is synthesized. Then, a narrow controllable notched band is introduced by a coupled external SIR. To be highlighted as an attractive advantage, as the characteristics of the UWB filter are not deteriorated by the placement of the external resonator, no further adjustments is needed for the synthesized UWB filter in this design. As an example, an (Federal Communications Commission) FCC UWB filter with a WLAN notch band is designed, simulated, and fabricated. A good agreement between the measured results and predicted ones validates the newly proposed design scheme and the filter prototype. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1842,1846, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25354 [source]

    A low voltage balanced Clapp VCO in 0.13 micromolar CMOS technology

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010
    Sheng-Lyang Jang
    Abstract A balanced voltage-controlled oscillator (VCO) is designed and implemented in a 0.13 ,m CMOS 1P8M process. The designed VCO circuit topology is an all nMOS LC-tank Clapp VCO using a series-tuned resonator. At the supply voltage of 0.5 V, the output phase noise of the VCO is ,108.69 dBc/Hz at 1 MHz offset frequency from the carrier frequency of 17.72 GHz, and the figure of merit is ,186.84 dBc/Hz. The core power consumption is 4.2 mW. Tuning range is about 3.32 GHz, from 17.55 to 20.87 GHz, while the control voltage was tuned from 0 to 1.3 V. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1623,1625, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25275 [source]

    A new compact band-pass filter based on an asymmetric short-circuited spurline resonator

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010
    P. Rodriguez-Cepeda
    Abstract In this letter, a new compact two-pole band-pass filter (BPF) based on an asymmetric short-circuited spurline resonator is presented. The filter is modeled by means of a new multimodal circuit model for a microstrip to three-line-microstrip cross, which allows a rigorous study of a very generic new family of filters. A BPF centered at 1.9 GHz has been designed, measured, and simulated using this multimodal model. A good agreement between measurements and simulations has been obtained. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1328,1331, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25161 [source]

    A 90 nm CMOS dual-band divide-by-2 and -4 injection-locked frequency divider

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010
    Sheng-Lyang Jang
    Abstract A fourth-order resonator has been implemented to design a 65 GHz injection-locked frequency divider (ILFD) implemented in a 90 nm CMOS process. The ILFD is realized with a cross-coupled nMOS LC-tank oscillator with an inductor switch for frequency band selection. The LC tank can be a second-or fourth-order resonator depending upon the on/off state of a switch across a series-tuned inductor. Measurement results show that at the supply voltage of 0.5 V, the free-running frequency is from 8.68 (16.147) to 9.928 (17.89) GHz for the low- (high-) frequency band. The divide-by-2 operational locking range is from 14.9 (30.64) to 22.2 (37.74) GHz for the low-(high)-frequency band. The divide-by-4 operational locking range is from 34.4 (64.6) to 40.35 (67) GHz for the low-(high)-frequency band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1421,1425, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25217 [source]

    Dual-mode trapezium-loop microstrip bandpass filter

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
    You-Jun Zhang
    Abstract A novel compact and simple microstrip trapezium loop bandpass filter structure using only one resonator is developed in this letter, the inequilaterally structure perturbs the fields of the resonator and excite degenerate modes. Without coupling gaps, the new filter can reduce uncertainty in fabrication. Simulated results agree well with measured results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:840,841, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25074 [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]