The Compact RCS / Antenna Range at MIT Lincoln Laboratory Please share
... between measurements and allows, for example, a second target in the chamber to be used for the reference at the higher bands. Although this is a potentially useful feature, it has proved difficult to implement in practice because of low return signal levels. The instrumentation system also can cont ...
... between measurements and allows, for example, a second target in the chamber to be used for the reference at the higher bands. Although this is a potentially useful feature, it has proved difficult to implement in practice because of low return signal levels. The instrumentation system also can cont ...
Backward-wave regime and negative refraction in chiral composites
... chirality parameter, and k0 is the free-space wavenumber (see, e.g., ). Near the resonance of electric or /and magnetic susceptibilities the refractive index n can become smaller than the chirality parameter κ. It means that one of the two eigenwaves is a backward wave, because its phase velocity is ...
... chirality parameter, and k0 is the free-space wavenumber (see, e.g., ). Near the resonance of electric or /and magnetic susceptibilities the refractive index n can become smaller than the chirality parameter κ. It means that one of the two eigenwaves is a backward wave, because its phase velocity is ...
some tests to confirm the companion wave
... According to theory, an interaction takes place between the electromagnetic(EM) wave fields of the radiating dipole and the magnetic field of the non-radiating (ideally) loop in the region of the loop. This interaction causes part of the magnetic energy of the loop to be carried away by the EM wave. ...
... According to theory, an interaction takes place between the electromagnetic(EM) wave fields of the radiating dipole and the magnetic field of the non-radiating (ideally) loop in the region of the loop. This interaction causes part of the magnetic energy of the loop to be carried away by the EM wave. ...
Antennas & Propagation
... Dipole Radiation Pattern Radiation Pattern is defined as … “… the variation of the magnitude of the electric or magnetic field as a function of direction (at a distance far from the antenna).” ...
... Dipole Radiation Pattern Radiation Pattern is defined as … “… the variation of the magnitude of the electric or magnetic field as a function of direction (at a distance far from the antenna).” ...
PDF only - at www.arxiv.org.
... no momentum is imparted on the body by this wave. On the other hand, the upstream wave should be either absorbed or reflected by the material body so that it can transfer a negative momentum to the body, and induce the negative optical force. Thus, the material body must scatter the waves propagatin ...
... no momentum is imparted on the body by this wave. On the other hand, the upstream wave should be either absorbed or reflected by the material body so that it can transfer a negative momentum to the body, and induce the negative optical force. Thus, the material body must scatter the waves propagatin ...
Chapter 13
... IMPORTANT • There are two different velocities for a traveling transverse wave. – The wave speed, which is literally how fast the wave is moving to the left or to the right. ...
... IMPORTANT • There are two different velocities for a traveling transverse wave. – The wave speed, which is literally how fast the wave is moving to the left or to the right. ...
3D Electromagnetic Field Simulation in Microwave Ovens: a Tool to
... material was simulated, where 4 hot spot’s was observed. This phenomenon presents a challenge for microwave engineers, since sample cracking are often exhibited, mainly because the formation of hot spot’s due an inhomogeneous electromagnetic field distribution. ...
... material was simulated, where 4 hot spot’s was observed. This phenomenon presents a challenge for microwave engineers, since sample cracking are often exhibited, mainly because the formation of hot spot’s due an inhomogeneous electromagnetic field distribution. ...
OPTICAL PROPERTIES of Nanomaterials
... Properties of core-shell nanostructures: dielectric or semiconductor on metal SiO2 shell on various cores have been studied. E.g. Au@SiO2. Core shell nanowires have also been prepared. E.g. Ni@TiO2. Au@SiO2: Nanosized gold colloids show a very intense surface plasmon absorption band in the vi ...
... Properties of core-shell nanostructures: dielectric or semiconductor on metal SiO2 shell on various cores have been studied. E.g. Au@SiO2. Core shell nanowires have also been prepared. E.g. Ni@TiO2. Au@SiO2: Nanosized gold colloids show a very intense surface plasmon absorption band in the vi ...
4 T M RANSMISSION
... the tremendous capacity of optical fiber has made that medium more attractive than coaxial cable, and thus optical fiber has taken over much of the market for high-speed LANs and for long-distance applications. • Unguided transmission techniques commonly used for information communications include b ...
... the tremendous capacity of optical fiber has made that medium more attractive than coaxial cable, and thus optical fiber has taken over much of the market for high-speed LANs and for long-distance applications. • Unguided transmission techniques commonly used for information communications include b ...
Fundamentals of Antennas and Radiating systems
... In wireless communication systems, signals are radiated in space as an electromagnetic wave by using a receiving transmitting antenna and a fraction of this radiated power is intercepted by using a receiving antenna. Thus, an antenna is a device used for radiating or receiver radio waves. An antenna ...
... In wireless communication systems, signals are radiated in space as an electromagnetic wave by using a receiving transmitting antenna and a fraction of this radiated power is intercepted by using a receiving antenna. Thus, an antenna is a device used for radiating or receiver radio waves. An antenna ...
1 Highly Accurate Quasi-Static Modeling of Microstrip Lines Over
... recognized that this leads to a reduction in the effective separation between the signal and the ground plane, as well as inducing significant loss due to series resistance [3, 5]. In contrast, if the frequency or conductivity is low enough that the skin depth is larger than the thickness of the sem ...
... recognized that this leads to a reduction in the effective separation between the signal and the ground plane, as well as inducing significant loss due to series resistance [3, 5]. In contrast, if the frequency or conductivity is low enough that the skin depth is larger than the thickness of the sem ...
Negative Refraction and Left-handed electromagnetism in
... It has since been proposed that negative refraction can be achieved in photonic crystals (PC), which are inhomogeneous periodic media with lattice constant comparable to the wavelength 6,7,8. A PC is an artificial structure, usually made of a dielectric or metal, designed to control photons similar ...
... It has since been proposed that negative refraction can be achieved in photonic crystals (PC), which are inhomogeneous periodic media with lattice constant comparable to the wavelength 6,7,8. A PC is an artificial structure, usually made of a dielectric or metal, designed to control photons similar ...
Microwave Interferometry:
... waveguide. It probably consists of some kind of resonant cavity whose properties can be adjusted. A matched signal has a much higher amplitude and should suffer lower loss in the waveguide. Waveguide Tuner: Gain Horns: Some of the samples attenuate the microwave beam. These amplified the signal by 5 ...
... waveguide. It probably consists of some kind of resonant cavity whose properties can be adjusted. A matched signal has a much higher amplitude and should suffer lower loss in the waveguide. Waveguide Tuner: Gain Horns: Some of the samples attenuate the microwave beam. These amplified the signal by 5 ...
Presentation
... – Can travel through space where matter is not present – We cannot hear them, but can feel and experience their effects ...
... – Can travel through space where matter is not present – We cannot hear them, but can feel and experience their effects ...
„Thin Film Electroacoustic Devices“
... resolution) made on LiNbO3 has its center frequency at 1 GHz. To go towards higher frequencies, one could either employ a sub-micron lithography or choose a material with higher acoustic wave velocity like e.g. AlN or ZnO. As AlN or ZnO substrates are not available up to now, thin films are widely u ...
... resolution) made on LiNbO3 has its center frequency at 1 GHz. To go towards higher frequencies, one could either employ a sub-micron lithography or choose a material with higher acoustic wave velocity like e.g. AlN or ZnO. As AlN or ZnO substrates are not available up to now, thin films are widely u ...
Antennas and propagation
... the small loop antenna is actually just a large inductor. The real part of the input impedance is very small, on the order of 1 ohm, most of which is loss resistance in the conductor making up the loop. The actual radiation resistance may be 0.5 ohms or less. Because the radiation resistance is smal ...
... the small loop antenna is actually just a large inductor. The real part of the input impedance is very small, on the order of 1 ohm, most of which is loss resistance in the conductor making up the loop. The actual radiation resistance may be 0.5 ohms or less. Because the radiation resistance is smal ...
SCATTERING OF ELECTROMAGNETIC WAVES ON
... 3.3 Linear chain of nanoparticles parallel to the propagation of EM wave This structure is represented by three dimensional lattice of nanoparticles. The distance along the z direction (direction of propagation of EM wave) is much smaller (7 nm) than the lattice constant in the x-y plane (a = 26 nm ...
... 3.3 Linear chain of nanoparticles parallel to the propagation of EM wave This structure is represented by three dimensional lattice of nanoparticles. The distance along the z direction (direction of propagation of EM wave) is much smaller (7 nm) than the lattice constant in the x-y plane (a = 26 nm ...
Electromagnetic parameter retrieval from inhomogeneous
... We discuss the validity of standard retrieval methods that assign bulk electromagnetic properties, such as the electric permittivity and the magnetic permeability , from calculations of the scattering 共S兲 parameters for finite-thickness samples. S-parameter retrieval methods have recently become ...
... We discuss the validity of standard retrieval methods that assign bulk electromagnetic properties, such as the electric permittivity and the magnetic permeability , from calculations of the scattering 共S兲 parameters for finite-thickness samples. S-parameter retrieval methods have recently become ...
In this paper, formulas for calculating impedance parameters among
... using Thevenin equivalent circuit in Fig. 1. In this case, ZA is the input impedance seen at input terminals of an antenna in the presence of environment and in the absence of scatterers. When an antenna in the presence of environment and scatterers is excited with a source at its feed port, the ele ...
... using Thevenin equivalent circuit in Fig. 1. In this case, ZA is the input impedance seen at input terminals of an antenna in the presence of environment and in the absence of scatterers. When an antenna in the presence of environment and scatterers is excited with a source at its feed port, the ele ...
Equivalent isotropically radiated power
... end, which is near a conductive surface which works as a reflector (see Effect of ground). The current in the reflected image has the same direction and phase that the current in the real antenna. The set quarter-wave plus image forms a half-wave dipole that radiates only in the upper half of space. ...
... end, which is near a conductive surface which works as a reflector (see Effect of ground). The current in the reflected image has the same direction and phase that the current in the real antenna. The set quarter-wave plus image forms a half-wave dipole that radiates only in the upper half of space. ...
lecturer note 8
... 3. A uniform string of length 2 meter and mass 200 Gms is under a tension of 800N. Calculate the speed of transverse wave in the string. 4. A Uniform string S1 is connected with another uniform string S2 whose linear mass density is greater than that of S1 A wave pulse propagating alone one string m ...
... 3. A uniform string of length 2 meter and mass 200 Gms is under a tension of 800N. Calculate the speed of transverse wave in the string. 4. A Uniform string S1 is connected with another uniform string S2 whose linear mass density is greater than that of S1 A wave pulse propagating alone one string m ...
Topic Contribution to Silicon High Impedance and High Frequency
... microwaves, their short wave length, its wide bandwidth and the existence of molecular, atomic or nuclear resonances at those frequencies. A common aspect of all existing applications is that they exploit the properties of microwaves interacting with objects of a size comparable or greater to their ...
... microwaves, their short wave length, its wide bandwidth and the existence of molecular, atomic or nuclear resonances at those frequencies. A common aspect of all existing applications is that they exploit the properties of microwaves interacting with objects of a size comparable or greater to their ...
Input Impedance, VSWR and Return Loss of a Conformal Microstrip
... Joseph A. et al, presented an approach to the analysis of microstrip antennas on cylindrical surface. In this approach, the field in terms of surface current is calculated, while considering dielectric layer around the cylindrical body. The assumption is only valid if radiation is smaller than store ...
... Joseph A. et al, presented an approach to the analysis of microstrip antennas on cylindrical surface. In this approach, the field in terms of surface current is calculated, while considering dielectric layer around the cylindrical body. The assumption is only valid if radiation is smaller than store ...
FINITE-ELEMENT ANALYSIS OF MAGNETIC FIELD DISTRIBUTION
... S.A. Antipov, D.A. Eroshenko, A.I. Klimov A simplified mathematical models for an approximate calculation of the dispersion characteristics of planar infinitely extended leaky wave structures with H- and E-polarization, containing a two-layer dielectric waveguide on a metal screen and one-dimensiona ...
... S.A. Antipov, D.A. Eroshenko, A.I. Klimov A simplified mathematical models for an approximate calculation of the dispersion characteristics of planar infinitely extended leaky wave structures with H- and E-polarization, containing a two-layer dielectric waveguide on a metal screen and one-dimensiona ...
Paper - ResearchGate
... Loop antennas have found to be very useful as receivers. For low frequencies—where dipoles would become very large—loop antennas can be used. While the efficiency of a small loop antenna is not good, a high signal-to-noise ratio makes up for it. A common method to increase loop antennas’ performance ...
... Loop antennas have found to be very useful as receivers. For low frequencies—where dipoles would become very large—loop antennas can be used. While the efficiency of a small loop antenna is not good, a high signal-to-noise ratio makes up for it. A common method to increase loop antennas’ performance ...
Metamaterial antenna
Metamaterial antennas are a class of antennas which use metamaterials to increase performance of miniaturized (electrically small) antenna systems. Their purpose, as with any electromagnetic antenna, is to launch energy into free space. However, this class of antenna incorporates metamaterials, which are materials engineered with novel, often microscopic, structures to produce unusual physical properties. Antenna designs incorporating metamaterials can step-up the antenna's radiated power.Conventional antennas that are very small compared to the wavelength reflect most of the signal back to the source. A metamaterial antenna behaves as if it were much larger than its actual size, because its novel structure stores and re-radiates energy. Established lithography techniques can be used to print metamaterial elements on a PC board.These novel antennas aid applications such as portable interaction with satellites, wide angle beam steering, emergency communications devices, micro-sensors and portable ground-penetrating radars to search for geophysical features.Some applications for metamaterial antennas are wireless communication, space communications, GPS, satellites, space vehicle navigation and airplanes.