Browsing by Keywords "Natural frequencies"
Now showing items 2140 of 47

Gunn oscillations in GaN channels
(IOP, 2004)Gallium nitride with its high negative differential mobility threshold is an appealing material for high power millimetrewave oscillators as a Gunn diode. By means of extensive ensemble Monte Carlo simulations, the dynamics ... 
Harmonic cantilevers for nanomechanical sensing of elastic properties
(IEEE, 200306)We present a micromachined scanning probe cantilever, in which a specific higher order flexural mode is designed to be resonant at an exact integer multiple of the fundamental resonance frequency. We have demonstrated that ... 
Highresolution imaging of elastic properties using harmonic cantilevers
(Elsevier, 2004)We present a micromachined scanning probe cantilever, in which a specific higherorder flexural mode is designed to be resonant at an exact integer multiple of the fundamental resonance frequency. We have fabricated such ... 
Hybrid model for probefed rectangular microstrip antennas with shorting pins
(IEEE, 2000)For a probefed microstrip antenna, it is quite common to employ the cavity model to find the field distribution under the patch and other electrical properties. Therefore, a multiport analysis technique based on the cavity ... 
Improved performance of cMUT with nonuniform membranes
(IEEE, 200509)When capacitive micromachined ultrasonic transducers are immersed in water, the bandwidth of the device is limited by the membrane's second resonance frequency. At this frequency no mechanical power to immersion medium can ... 
Interaction between a cMUT cell and a liquid medium around the parallel resonance frequency
(IEEE, 200710)In this paper, we present how a capacitive micromachined ultrasonic transducer (cMUT) couples to the immersion medium, based on an accurate parametric model. We show that the velocity of cMUT membrane can be written as a ... 
Investigation of magnetic resonances for different splitring resonator parameters and designs
(Institute of Physics Publishing, 2005)We investigate the magnetic resonance of splitring resonators (SRR) experimentally and numerically. The dependence of the geometrical parameters on the magnetic resonance frequency of SRR is studied. We further investigate ... 
Lasermicromachined millimeterwave photonic bandgap cavity structures
(American Institute of Physics, 1995)We have used lasermicromachined alumina substrates to build a threedimensional photonic bandgap crystal. The rodbased structure has a threedimensional full photonic band gap between 90 and 100 GHz. The high resistivity ... 
Location and curvature estimation of spherical targets using multiple sonar timeofflight measurements
(Institute of Electrical and Electronics Engineers, 199912)A novel, flexible, threedimensional multisensor sonar system is described to localize the center of a generalized spherical target and estimate its radius of curvature. Point, line, and planar targets are included as ... 
Metamaterial Absorber Based Multifunctional Sensor Application
(Institute of Physics Publishing, 2017)In this study metamaterial based (MA) absorber sensor, integrated with an Xband waveguide, is numerically and experimentally suggested for important application including pressure, density sensing and marble type detecting ... 
Metamaterialbased wireless RFMEMS strain sensors
(IEEE, 2010)Approximately 10% of the fractures do not heal properly because of the inability to monitor fracture healing. Standard radiography is not capable of discriminating whether bone healing is occurring normally or aberrantly. ... 
Metamaterialbased wireless strain sensors
(American Institute of Physics, 20090707)We proposed and demonstrated metamaterialbased strain sensors that are highly sensitive to mechanical deformation. Their resonance frequency shift is correlated with the surface strain of our test material and the strain ... 
Multigap individual and coupled splitring resonator structures
(Optical Society of American (OSA), 2008)We present a systematic numerical study, validated by accompanied experimental data, of individual and coupled split ring resonators (SRRs) of a single rectangular ring with one, two and four gaps. We discuss the behavior ... 
Multilevel PO algorithm for nonuniform triangulations
(ESA Publications, 2006)Fast physical optics (FPO) algorithm provides a speedup for computing the physical optics (PO) integral over complex bodies for a range of aspect angles and frequencies. In this paper, this algorithm is further developed ... 
Nested metamaterials for wireless strain sensing
(IEEE, 20091228)We designed, fabricated, and characterized metamaterialbased RFmicroelectromechanical system (RFMEMS) strain sensors that incorporate multiple split ring resonators (SRRs) in a compact nested architecture to measure ... 
A new effective side length expression obtained using a modified tabu search algorithm for the resonant frequency of a triangular microstrip antenna
(John Wiley & Sons, 1998)A new, very simple curvefitting expression for the effective side length is presented for the resonant frequency of triangular microstrip antennas. It is obtained using a modified tabu search algorithm, and is useful for ... 
Optimization and tunability of deep subwavelength resonators for metamaterial applications: complete enhanced transmission through a subwavelength aperture
(Optical Society of American (OSA), 2009)In the present work, we studied particle candidates for metamaterial applications, especially in terms of their electrical size and resonance strength. The analyzed particles can be easily produced via planar fabrication ... 
Optimizing CMUT geometry for high power
(IEEE, 2010)Capacitive micromachined ultrasonic transducers (CMUTs) have demonstratedvarious advantages over piezoelectric transducers. However, current CMUT designsproduce low output pressures with high harmonic distortions. Optimizing ... 
Photonic band gap in the triangular lattice of BoseEinsteincondensate vortices
(2007)We investigate the photonic bands of an atomic BoseEinstein condensate with a triangular vortex lattice. Index contrast between the vortex cores and the bulk of the condensate is achieved through the enhancement of the ... 
Reflection properties of metallic photonic crystals
(1998)We measured reflectionmagnitude and reflectionphase properties of metallic photonic crystals. The experimental results are in good agreement with the theoretical calculations. We converted the reflectionphase information ...