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Добірка наукової літератури з теми "Non-radiating source"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Non-radiating source"

1

Cartlidge, Edwin. "Physicists fabricate a non-radiating antenna." Physics World 34, no. 9 (December 1, 2021): 6i. http://dx.doi.org/10.1088/2058-7058/34/09/06.

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2

SINAYOKO, SAMUEL, A. AGARWAL, and Z. HU. "Flow decomposition and aerodynamic sound generation." Journal of Fluid Mechanics 668 (December 3, 2010): 335–50. http://dx.doi.org/10.1017/s0022112010004672.

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An approximate decomposition of fluid-flow variables satisfying unbounded compressible Navier–Stokes equations into acoustically radiating and non-radiating components leads to well-defined source terms that can be identified as the physical sources of aerodynamic noise. We show that, by filtering the flow field by means of a linear convolution filter, it is possible to decompose the flow into non-radiating and radiating components. This is demonstrated on two different flows: one satisfying the linearised Euler equations and the other the Navier–Stokes equations. In the latter case, the corresponding sound sources are computed. They are found to be more physical than those computed through classical acoustic analogies in which the flow field is decomposed into a steady mean and fluctuating component.
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3

Shahir, Shahed, Mehrbod Mohajer, Arash Rohani, and Safieddin Safavi-Naeini. "PERMITTIVITY PROFILE ESTIMATION BASED ON NON-RADIATING EQUIVALENT SOURCE (2D CASE)." Progress In Electromagnetics Research B 50 (2013): 157–75. http://dx.doi.org/10.2528/pierb13012308.

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4

Xiao, Gaobiao, and Rui Liu. "Direct Method for Reconstructing the Radiating Part of a Planar Source from Its Far-Fields." Electronics 11, no. 23 (November 22, 2022): 3852. http://dx.doi.org/10.3390/electronics11233852.

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A planar current is generally divided into a radiating part that mainly generates propagation fields and a non-radiating part that mainly generates evanescent fields. This paper proposes a direct method to reconstruct the radiating part of a planar source from its far-fields based on their explicit relationships. A standard reconstruction process is provided in which the far-fields are sampled at the peaks of their propagation modes. An analysis shows that the achievable reconstruction resolution of the source distribution is about half a wavelength. The paper also demonstrates that it is possible to reconstruct the source by sampling the far-fields on a plane or along a linear path. The performance of the reconstruction algorithm is illustrated with numerical examples.
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5

Herrera, L., A. Di Prisco, and J. Ospino. "The transition of a gravitationally radiating, dissipative fluid to equilibrium." Canadian Journal of Physics 96, no. 9 (September 2018): 1010–15. http://dx.doi.org/10.1139/cjp-2017-0651.

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Анотація:
We describe the transition of a gravitationally radiating, axially and reflection symmetric, dissipative fluid to a non-radiating state. It is shown that very shortly after the end of the radiating regime, at a time scale on the order of the thermal relaxation time, the thermal adjustment time, or the hydrostatic time (whichever is larger), the system reaches the equilibrium state. This result is at variance with all the studies carried out in the past on gravitational radiation outside the source, which strongly suggest that after a radiating period, the conditions for a return to a static case look rather forbidding. As we shall see, the reason for such a discrepancy resides in the fact that some elementary, but essential, physical properties of the source have been overlooked in these latter studies.
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6

FREUND, JONATHAN B. "Noise sources in a low-Reynolds-number turbulent jet at Mach 0.9." Journal of Fluid Mechanics 438 (July 5, 2001): 277–305. http://dx.doi.org/10.1017/s0022112001004414.

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Анотація:
The mechanisms of sound generation in a Mach 0.9, Reynolds number 3600 turbulent jet are investigated by direct numerical simulation. Details of the numerical method are briefly outlined and results are validated against an experiment at the same flow conditions (Stromberg, McLaughlin & Troutt 1980). Lighthill's theory is used to define a nominal acoustic source in the jet, and a numerical solution of Lighthill's equation is compared to the simulation to verify the computational procedures. The acoustic source is Fourier transformed in the axial coordinate and time and then filtered in order to identify and separate components capable of radiating to the far field. This procedure indicates that the peak radiating component of the source is coincident with neither the peak of the full unfiltered source nor that of the turbulent kinetic energy. The phase velocities of significant components range from approximately 5% to 50% of the ambient sound speed which calls into question the commonly made assumption that the noise sources convect at a single velocity. Space–time correlations demonstrate that the sources are not acoustically compact in the streamwise direction and that the portion of the source that radiates at angles greater than 45° is stationary. Filtering non-radiating wavenumber components of the source at single frequencies reveals that a simple modulated wave forms for the source, as might be predicted by linear stability analysis. At small angles from the jet axis the noise from these modes is highly directional, better described by an exponential than a standard Doppler factor.
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7

CASADIO, R. "GAMMA-RAY BURSTS FROM GRAVITATIONAL COLLAPSE." International Journal of Modern Physics A 17, no. 20 (August 10, 2002): 2753. http://dx.doi.org/10.1142/s0217751x02011801.

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A possible origin of gamma-ray bursts is the gravitational collapse of compact objects. A semiclassical analysis, which employs the Born-Oppenheimer approximation in order to treat gravity as classical while matter is quantized1, was first applied to homogeneous spheres of dust2,3 and (thick) non-radiating shells 4. We later derived an effective Lagrangian for (thin) radiating shells5 which allowed us to study the evolution of a self-gravitating shell of bosonic matter coupled to a scalar radiation field. We showed that the matter can form a condensate and the matter degrees of freedom are excited, because of the non-adiabaticity of the collapse, at the expense of gravitational energy4,6. Upon decaying back to the ground state, the excited matter energy is subsequently transferred to the radiation field. In fact, the system can convert large fractions of its gravitational energy into radiation and the time evolution of the radius of the shell is then significantly slowed down with respect to the non-radiating case. This provides a new mechanism to extract energy from collapsing matter which might play a role as a source of gamma-ray bursts.
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8

Hoenders, Bernhard J., and Hedzer A. Ferwerda. "The non-radiating component of the field generated by a finite monochromatic scalar source distribution." Pure and Applied Optics: Journal of the European Optical Society Part A 7, no. 5 (September 1998): 1201–11. http://dx.doi.org/10.1088/0963-9659/7/5/025.

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9

Tang, Ming-Chun, Ting Shi, and Richard W. Ziolkowski. "Electrically Small, Broadside Radiating Huygens Source Antenna Augmented With Internal Non-Foster Elements to Increase Its Bandwidth." IEEE Antennas and Wireless Propagation Letters 16 (2017): 712–15. http://dx.doi.org/10.1109/lawp.2016.2600525.

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10

Zatta, Robin, Daniel Headland, Eamal Ashna, Ritesh Jain, Philipp Hillger, Janusz Grzyb, and Ullrich R. Pfeiffer. "Silicon Lens Optimization to Create Diffuse, Uniform Illumination from Incoherent THz Source Arrays." Journal of Infrared, Millimeter, and Terahertz Waves 42, no. 9-10 (September 2021): 947–59. http://dx.doi.org/10.1007/s10762-021-00828-0.

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AbstractArrays of terahertz (THz) sources provide a pathway to overcoming the radiation power limitations of single sources. Several independent sources of THz radiation may be implemented in a single integrated circuit, thereby realizing a monolithic THz source array of high output power. Integrated THz sources must generally be backside-coupled to extended hemispherical dielectric lenses in order to suppress substrate modes and extract THz power. However, this lens also increases antenna gain and thereby produces several non-overlapping beams. This is because individual source pixels are relatively large. Hence, their spatial separation on-chip translates to angular separation in the far-field. In other words, there are gaps in their field of view into which very little THz power is projected. Therefore, they cannot homogeneously illuminate an imaging target. This article presents a simple, practical, and scalable method to convert arrays of incoherent THz sources into a diffuse, uniform illumination source without the need for reducing pixel size. Briefly, individual beam divergence is optimized by tailoring the dimensions of the extended hemispherical dielectric lens such that the far-field beams of adjacent source pixels overlap and combine to form a uniform far-field beam. We applied this method to an incoherent 8 × 8-pixel THz source array radiating 10.3 dBm at 0.42 THz as a proof of concept and thereby realized a 10.3-dBm 0.42-THz diffuse, uniform illumination source that was then deployed in a demonstration of THz active imaging.
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Дисертації з теми "Non-radiating source"

1

LABATE, GIUSEPPE. "A Tri-vial Contrast Theory for Electromagnetic Invisibility: Cloaking and Non-radiating Sources." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2711510.

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Анотація:
Novel closed-form expressions and general conditions for achieving electromagnetic invisibility are exposed and detailed in terms of a familiar concept in visual and reading contexts: the contrast. Defined as a normalized difference between some property P and the same homogeneous property of the background Pb, the contrast has been used as a parameter in Microwave Imaging problems to detect the presence of buried or unknown scatterers in a given scenario. However, when the contrast is low and it approaches zero, it becomes difficult to reveal the presence of objects in a defined background: such structures appear to be undetectable or invisible. Starting from this observation, all the mathematical conditions for electromagnetic invisibility are reported from two different perspectives: non-radiating sources, when the excitation is internal to the structure itself, and cloaking devices, when the excitation comes from the external world and it is impinging into the device itself. The interests in such invisible structures come from different research areas: optics, for the non-radiating feature of anapole modes, microwave engineering, for surface waves excitation in cloaking devices, and physics, for coordinate transformation in electromagnetics. All these aspects are treated and discussed, with the introduction of two novel concepts for achieving the zeros of the scattered field: the nulling of the average sources in the domain of interest, namely weak solution, and the zeros of the equivalent sources, namely strong solution. The first approach is validated in the quasi-static limit, where closed-form expressions can be written for dielectric-plasmonic systems and for dielectric-metallic patterned particles. In this subwavelength approximation, it turns out that to achieve a non-radiating or cloaking effect, objects can be modeled in terms of lumped elements and the local condition in the domain of interest can be written in the form of the Kirchhoff’s Current Law. The second approach is validated beyond the quasi-static limit and it can be written in the form of a matching problem, where objects can be modeled by lumped admittances and the fields are decomposed in terms of harmonic waves. In order to achieve the non-radiating or cloaking feature, a cancellation effect has to take place for one (or more) harmonic mode(s) and this is performed for dielectric objects by inserting a lumped surface admittance at the object’s contour. Results are shown for single harmonic cancellation, where the surface admittance function Zs appears to be purely reactive and it is computed exploiting the notion of contrast: as a normalized difference between the admittance of the bare object and the admittance of the background region. In this case of single harmonic suppression, the choice is limited to the harmonic mode which is dominant in the scattered field (in the quasi-static limit, n=0) and such dominant scattering contribution changes as the frequency is increased (n ≥ 1 beyond the subwavelength limit). For multi-harmonic cancellation, results indicate that the surface admittance functions Zs appears to be of complex value, with resistive and reactive parts that start oscillating around the azimuthal coordinate, where the admittance mantle cloak is inserted. This oscillating behaviour, especially in the resistive part, is quite sensitive to the changing in the direction of incidence for the incoming wave, but it is able to suppress an arbitrary portion of the harmonic content (n = 0,1, ..,M). Investigations on the effects of the frequency regime and on the change of the direction of incidence are performed for volumetric systems, where the transition from the subwavelength limit to any frequency regime leads to the transition from plasmonics to the use of all-positive dielectric coatings. Exploiting the formulation of an Inverse Scattering Problem, it is possible to manipulate the internal configuration of the electromagnetic fields in many dielectric structures, as a function of the radius of the coating region, in order to synthesize the zeros of the external scattered field in a certain frequency band and for a finite number of direction of arrival for the incoming wave. The arrangement of the dielectric permittivity in the coating layer follows the characteristics of the imposed specifications, especially the number of direction of arrivals (for which the all-dielectric device is cloaked) that ensures the same number of axis of symmetry on the dielectric structure. Concluding remarks and final recap of this PhD study are indicated.
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2

Tang, Ming-Chun, Ting Shi, and Richard W. Ziolkowski. "Electrically Small, Broadside Radiating Huygens Source Antenna Augmented With Internal Non-Foster Elements to Increase Its Bandwidth." IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017. http://hdl.handle.net/10150/623616.

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A broadside radiating, linearly polarized, electrically small Huygens source antenna system that has a large impedance bandwidth is reported. The bandwidth performance is facilitated by embedding non-Foster components into the near-field resonant parasitic elements of this metamaterial-inspired antenna. High-quality and stable radiation performance characteristics are achieved over the entire operational bandwidth. When the ideal non-Foster components are introduced, the simulated impedance bandwidth witnesses approximately a 17-fold enhancement over the passive case. Within this -10-dB bandwidth, its maximum realized gain, radiation efficiency, and front-to-back ratio (FTBR) are, respectively, 4.00 dB, 88%, and 26.95 dB. When the anticipated actual negative impedance convertor circuits are incorporated, the impedance bandwidth still sustains more than a 10-fold enhancement. The peak realized gain, radiation efficiency, and FTBR values are, respectively, 3.74 dB, 80%, and 28.01 dB, which are very comparable to the ideal values.
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3

Gelmini, Angelo. "Advanced Analysis and Synthesis Methods for the Design of Next Generation Reflectarrays." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243312.

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Анотація:
The design of reflectarray surface currents that satisfy both radiation and user-defined antenna feasibility constraints is addressed through a novel paradigm which takes advantage of the non-uniqueness of inverse source (IS) problems. To this end, the synthesis is formulated in the IS framework and its non-measurable solutions are employed as a design DoF. Thanks to the adopted framework, a closed-form expression for the design of reflectarray surface currents is derived which does not require any iterative local/global optimization procedure and which inherently satisfies both the radiation and the feasibility design constraints. The features and potentialities of the proposed strategy are assessed through selected numerical experiments dealing with different reflectarray aperture types/sizes and forbidden region definitions.
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4

Gelmini, Angelo. "Advanced Analysis and Synthesis Methods for the Design of Next Generation Reflectarrays." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243312.

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Анотація:
The design of reflectarray surface currents that satisfy both radiation and user-defined antenna feasibility constraints is addressed through a novel paradigm which takes advantage of the non-uniqueness of inverse source (IS) problems. To this end, the synthesis is formulated in the IS framework and its non-measurable solutions are employed as a design DoF. Thanks to the adopted framework, a closed-form expression for the design of reflectarray surface currents is derived which does not require any iterative local/global optimization procedure and which inherently satisfies both the radiation and the feasibility design constraints. The features and potentialities of the proposed strategy are assessed through selected numerical experiments dealing with different reflectarray aperture types/sizes and forbidden region definitions.
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Частини книг з теми "Non-radiating source"

1

"Non-radiating Sources & Non-propagating Fields." In Near-Field Microscopy and Near-Field Optics, 17–30. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2003. http://dx.doi.org/10.1142/9781848161351_0002.

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Тези доповідей конференцій з теми "Non-radiating source"

1

Zanganeh, E., A. Evlyukhin, A. Miroshnichenko, and P. Kapitanova. "Non-Radiating Electric Source Based on Anapole State." In 2021 Fifteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE, 2021. http://dx.doi.org/10.1109/metamaterials52332.2021.9577196.

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2

Shahir, Shahed, Safieddin Safavi-Naeini, and Jeff Orchard. "Scatterer localization based on the non-radiating equivalent source." In 2014 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2014. http://dx.doi.org/10.1109/aps.2014.6905289.

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3

Sihvola, Ari, Gerhard Kristensson, and Ismo Lindell. "Time-domain microwave transmission lines and the non-radiating source problem." In 27th European Microwave Conference, 1997. IEEE, 1997. http://dx.doi.org/10.1109/euma.1997.337970.

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4

Gelmini, A., M. Salucci, G. Oliveri, and A. Massa. "Innovative Synthesis of Reflectarrays within the Non-Radiating Inverse Source Framework." In 12th European Conference on Antennas and Propagation (EuCAP 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.0864.

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5

Gamliel, Avshalom, K. Kim, and E. Wolf. "New method for specifying nonradiating sources and their fields." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.wo6.

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Анотація:
The subject of nonradiating source distributions is important in connection with the uniqueness of various wave theoretic inverse problems.1 In spite of this fact, no general technique appears to have been developed so far for specifying all non-radiating sources that can be associated with a given source domain. Moreover, relatively little is known about fields that nonradiating sources generate within the region that they occupy.
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6

Manela, A. "Effects of Non-Linear Eddy-Airfoil Interaction on the Acoustic Radiation of a Thin Wing." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70217.

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We study the combined effect of boundary animation (small-amplitude heaving) and incoming flow unsteadiness (incident vorticity) on the vibroacoustic signature of a thin rigid airfoil in low-Mach high-Reynolds number flow. The nonlinear dynamical problem for the vortex trajectory is studied using potential flow theory. The dynamical description then serves as an effective source term to evaluate the far-field sound using Powell-Howe’s analogy. The results identify the fluid-airfoil system as a dipole-type source, and demonstrate the significance of non-linear eddy-airfoil interaction on the acoustic radiation. At low heaving frequencies (ωa/U < 1, where ω denotes the heaving frequency, 2a the airfoil chord, and U the mean stream speed), the effect of heaving is minor, and the acoustic field can be approximated by neglecting airfoil motion. However, at ωa/U > 1, heaving becomes dominant, radiating sound through an “airfoil motion” dipole (oriented along the direction of heaving) and airfoil-induced oscillations in the vortex trajectory. In contrast with the periodic “airfoil motion” signal, the non-periodic incident vortex sound has a component along the airfoil chord, which becomes significant when the vortex passes close to the airfoil. The work is suggested as a preliminary tool to examine the acoustic radiation during flapping flight at unsteady flow conditions.
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7

Long, Dean, and Steve Martens. "Simultaneous Noise and Performance Measurements for High Speed Jet Noise Reduction Technologies: Part II—Near Field Array Calibration." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46656.

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Part I of this paper describes a methodology for assessing the far field jet noise from high speed exhaust nozzles using a microphone array in the near field of the exhaust plume. The near field noise measurement is mathematically propagated producing an estimate of the noise level at the new location. Outward propagation produces an estimate of the far field noise. Propagation toward the jet axis produces the source distribution. Part II described here provides a direct validation of this process using a generic CD nozzle in a facility where both the near field and the far field are measured simultaneously. Comparison of these data sets show good agreement over the typical operating range for this type of nozzle. The far field noise is characterized by two independent processes: Shock cell noise radiating in the forward quadrant is produced when the nozzle is operated at non-ideally expanded conditions. Mach wave radiation propagates into the aft quadrant when the exhaust temperature is elevated. Subsequent tests in an acoustically treated nozzle thrust stand demonstrate the value of the near field array allowing immediate feedback on the noise/performance tradeoff for high speed jet noise reduction technologies.
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8

Long, Dean, and Steven Martens. "Simultaneous Noise and Performance Measurements for High-Speed Jet Noise Reduction Technologies." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59073.

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Анотація:
Model scale tests are conducted to assess the Noise/Performance trade for high speed jet noise reduction technologies. It is demonstrated that measuring the near field acoustic signature with a microphone array can be used to assess the far field noise using a procedure known as acoustic holography. The near field noise measurement is mathematically propagated producing an estimate of the noise level at the new location. Outward propagation produces an estimate of the far field noise. Propagation toward the jet axis produces the source distribution. Tests are conducted on convergent/divergent nozzles with three different area ratios, and several different chevron geometries. Noise is characterized by two independent processes: Shock cell noise radiating in the forward quadrant is produced when the nozzle is operated at non-ideally expanded conditions. Mach wave radiation propagates into the aft quadrant when the exhaust temperature is elevated. These results show good agreement with actual far field measurements from tests in the GE Cell 41 Acoustic Test Facility. Simultaneous performance measurement shows the change in thrust coefficient for different test conditions and configurations. Chevrons attached to the nozzle exit can reduce the noise by several dB at the expense of a minimal thrust loss.
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9

Gragnani, G. L., and M. Diaz Mendez. "An improved electromagnetic imaging procedure using non-radiating sources." In 2010 10th Mediterranean Microwave Symposium (MMS). IEEE, 2010. http://dx.doi.org/10.1109/mmw.2010.5605195.

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10

Labate, G., A. Alu, and T. Isernia. "2D Non-radiating Sources in Mie Scattering and Inverse Problems." In 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring). IEEE, 2019. http://dx.doi.org/10.1109/piers-spring46901.2019.9017717.

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