Browsing by Keywords "Natural frequencies"
Now showing items 120 of 47

Accurate resonant frequency computation of multisegment rectangular dielectric resonator antennas
(Taylor & Francis, 2010)In this study, multisegment dielectric resonator antenna (MSDRA) is analyzed. A new formulation depending on the Weighted Average Model (WAM) is proposed for the determination of resonant frequency which is called as ... 
AlGaN/GaN HEMTbased fully monolithic Xband low noise amplifier
(Wiley, 200504)A fully monolithic AlGaN/GaN HEMTbased low noise amplifier is reported. The circuit demonstrated a noise figure of 3.5 dB, gain of 7.5 dB, input return loss of 7.5 dB, and output return loss of 15 dB at 8.5 GHz. The ... 
Bandwidth improvement in a cMUT array with mixed sized elements
(IEEE, 200509)A capacitive micromachined ultrasonic transducer (cMUT) is typically fabricated by concatenation of several cMUT cells with identical physical dimensions. If the membrane thickness is kept fixed, the radius of the cMUT ... 
Characterization and imaging with lamb wave lens at gigahertz frequencies
(IEEE, 19941011)Lamb wave lenses with conical refracting surfaces are fabricated for use at 400 MHz and 1 GHz. The conical surfaces are ground and polished with mechanical means and they are sufficiently smooth for the frequencies of ... 
Circular highQ resonating isotropic strain sensors with large shift of resonance frequency under stress
(2009)We present circular architecture bioimplant strain sensors that facilitate a strong resonance frequency shift with mechanical deformation. The clinical application area of these sensors is for in vivo assessment of bone ... 
Collective oscillations in a twodimensional BoseEinstein condensate with a quantized vortex state
(The American Physical Society, 2005)We study the effect of lower dimensional geometry on the frequency splitting of the quadrupole oscillations of a harmonically trapped BoseEinstein condensate due to the presence of a quantized vortex. To study the effect ... 
Compact size highly directive antennas based on the SRR metamaterial medium
(Institute of Physics Publishing, 2005)In this work, we studied the farfield properties of the microwave radiation from sources embedded inside the splitring resonator (SRR) metamaterial medium. Our results showed that the emitted power near the resonance ... 
Comparisons of FMM implementations employing different formulations and iterative solvers
(IEEE, 200306)The implementation of multilevel fast multipole algorithm (MLFMA) requires the consideration of several parameters. The preferred combination of the parameters given is not trivially obvious and requires a careful ... 
Compound Hertzian chain model for coppercarbon nanocomposites' absorption spectrum
(2011)The infrared range optical absorption mechanism of carboncopper composite thin layer coated on the diamondlike carbon buffer layer has been investigated. By consideration of weak interactions between copper nanoparticles ... 
Computation of the resonant frequency of electrically thin and thick rectangular microstrip antennas with the use of fuzzy inference systems
(John Wiley & Sons, 2000)A new method for calculating the resonant frequency of electrically thin and thick rectangular microstrip antennas, based on the fuzzy inference systems, is presented. The optimum design parameters of the fuzzy inference ... 
Continuously tunable terahertz metamaterial employing magnetically actuated cantilevers
(Optical Society of American (OSA), 2011)Terahertz metamaterial structures that employ flexing microelectromechanical cantilevers for tuning the resonance frequency of an electric splitring resonator are presented. The tuning cantilevers are coated with a magnetic ... 
Correlation tracking based on wavelet domain information
(SPIE, 2004)Tracking moving objects in video can be carried out by correlating a template containing object pixels with pixels of the current frame. This approach may produce erroneous results under noise. We determine a set of ... 
Coupled matrix pencil method for frequency extrapolation of electromagnetic solutions
(IEEE, 2005)Matrix pencil method (MPM) is used to extrapolate the available electromagnetic solutions in frequency domain to estimate the highfrequency solutions. A new approach, namely, coupled MPM, is introduced to obtain the ... 
Design charts to maximize the gainbandwidth product of capacitive micromachined ultrasonic transducers
(IEEE, 2005)In this work we define a performance measure for capacitive micromachined ultrasonic transducers (cMUT) in the form of a gainbandwidth product to investigate the conditions that optimize the gain and bandwidth with respect ... 
Designing materials with desired electromagnetic properties
(Wiley, 2006)In this work, we suggest and demonstrate a robust method to tune the plasma frequencies of wire mediums. The method we suggest involves the use of two or more wire arrangements in the unit cell. By incorporating the method ... 
EEG sinyallerinde gamma tepkisinin tespiti
(IEEE, 200604)In the detection of the existence of the early gamma response, subjective methods have been used. In this study, an automated gamma detection technique is developed based on the features obtained from the time  frequency ... 
Effect of rf pumping frequency and rf input power on the flux to voltage transfer function of rfSQUIDs
(IEEE, 2007)We present the results on the correlation between the flux to voltage transfer function, Vspp, of the rfSQUID and the rfbias frequency as well as rfbias power. Measurements were performed for different SQUID gradiometer ... 
Enhanced transmission of microwave radiation in onedimensional metallic gratings with subwavelength aperture
(American Institute of Physics, 2004)We report a theoretical and experimental demonstration of enhanced microwave transmission through subwavelength apertures in metallic structures with doublesided gratings. Three different types of aluminum gratings ... 
Flexible strain sensors based on electrostatically actuated graphene flakes
(Institute of Physics Publishing, 2015)In this paper we present flexible strain sensors made of graphene flakes fabricated, characterized, and analyzed for the electrical actuation and readout of their mechanical vibratory response in strainsensing applications. ... 
Frequency responses of groundpenetrating radars operating over highly lossy grounds
(IEEE, 2002)The finitedifference timedomain (FDTD) method is used to investigate the effects of highly lossy grounds and the frequencyband selection on groundpenetratingradar (GPR) signals. The ground is modeled as a heterogeneous ...