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Surface impedance

Surface Impedance of Thin Superconducting Films

Surface Impedance of Thin Superconducting Films

... ~max0005 Page 001 SURFACE IMPEDANCE OF THIN SUPERCONDUCTING FILMS Thesis by Peter V Mason In Partial Fulfillment of the Requirements For the Degree of Doctor of Philosophy Califor nia Institute of Tec[.] ...

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Electromagnetic Waves Radiation by a Vibrators System with Variable Surface Impedance

Electromagnetic Waves Radiation by a Vibrators System with Variable Surface Impedance

... It is known that the characteristics of the Yagi-Uda antenna can be varied by adjusting the lengths of vibrators and distances between them. To obtain axial radiation of the Yagi-Uda antenna composed of perfectly ...

7

Simulating transient scattering from obstacles with frequency dependent surface impedance

Simulating transient scattering from obstacles with frequency dependent surface impedance

... case impedance boundary conditions in the form of equation 7 may be implemented ...where surface impedance and surface reflectance based boundary conditions are believed to be based on ...

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Surface impedance theory for superconductors in large static magnetic fields

Surface impedance theory for superconductors in large static magnetic fields

... A theory of electromagnetic absorption is presented to explain the changes in surface impedance for Pippard superconductors ( s >>A.).. The static magnetic fie[r] ...

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Piecewise Surface Impedance Boundary Conditions by Combining Rytov's Perturbation Method and Level Set Technique

Piecewise Surface Impedance Boundary Conditions by Combining Rytov's Perturbation Method and Level Set Technique

... The surface impedance was introduced to model conductors with a sufficiently strong skin effect. The main idea behind this concept is replacing the conducting volume by an approximate boundary condition ...

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Face Centered Anisotropic Surface Impedance Boundary Conditions in FDTD

Face Centered Anisotropic Surface Impedance Boundary Conditions in FDTD

... frequency-dependent surface impedance matrix in FDTD simulations; a short review of recent developments can be found in ...the impedance matrix elements, typically implemented using recursive ...

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Intelligent Metasurfaces with Continuously Tunable Local Surface Impedance for Multiple Reconfigurable Functions

Intelligent Metasurfaces with Continuously Tunable Local Surface Impedance for Multiple Reconfigurable Functions

... Both the tunable resistance R and tunable capacitance C in the ICs can be realized by conventional active elec- tronic circuits using MOSFET technology, e.g., transistors [38]. The variable resistance (varistor) can be ...

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Calculating Radar Cross Section of Lossy Targets Using the Surface Impedance Approach

Calculating Radar Cross Section of Lossy Targets Using the Surface Impedance Approach

... new surface impedance model is applied to the accurate calculation of the radar cross section of lossy conducting ...of surface current density with an accurate choice of basis and test ...complex ...

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An instrument for low  and variable temperature millimeter wave surface impedance measurements under magnetic fields

An instrument for low and variable temperature millimeter wave surface impedance measurements under magnetic fields

... the surface impedance, is of primary ...millimeter-wave surface impedance measurement in- strument based on the cavity perturbation ...

6

Derivation of characteristics of the relation between geomagnetic and geoelectric variation fields from the surface impedance for a two layer earth

Derivation of characteristics of the relation between geomagnetic and geoelectric variation fields from the surface impedance for a two layer earth

... the surface impedance, which is defined as the transfer function between the geo- electric and geomagnetic variation fields at the earth’s sur- face ...the surface impedance, or equivalently ...

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Surface Impedance of Thin Graphite Films at Microwave Frequencies

Surface Impedance of Thin Graphite Films at Microwave Frequencies

... The carbon is of particular interest, since it is a monocomponent material, which allows to form thin films with amorphous structures [1]. The structure of thin films made of amorphous carbon was investigated in detail [2, ...

7

Effect of Surface Impedance on Radiation Fields of Spherical Antennas

Effect of Surface Impedance on Radiation Fields of Spherical Antennas

... of surface impedance on radiation fields of spherical antennas excited by radially oriented electric dipole is investigated by using a Green’s function for a space outside a spherical ...an impedance ...

7

Ground effects of space weather investigated by the surface impedance

Ground effects of space weather investigated by the surface impedance

... is the “plane wave surface impedance”. Possible violations of the plane wave assumption resulting in so-called source effects have caused a lot of discussion in connection with geoelectromagnetic induction ...

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Non-Linear Surface Impedance of YBCO Superconductors

Non-Linear Surface Impedance of YBCO Superconductors

... We studied the different measurement techniques resonant used for microwave characterisation of high temperature superconducting samples and devices and the results are drawn in chapter [r] ...

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Non-Linear Surface Impedance of YBCO Superconductors

Non-Linear Surface Impedance of YBCO Superconductors

... P., "A non linear transmission line model for superconducting stripline resonators", IEEE trans 011 Applied superconductivity, 3, pp.. Ohshima S., Ogasawara and K.[r] ...

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Optimum High Impedance Surface Configuration for Mutual Coupling Reduction in Small Antenna Arrays

Optimum High Impedance Surface Configuration for Mutual Coupling Reduction in Small Antenna Arrays

... of surface impedance and a reflection phase of ...the impedance surface and reflection phase have been computed under normal ...the impedance surface is obtained by applying two ...

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Radiation Characteristics of Antennas on the Reactive Impedance Surface of a Circular Cylinder Providing Reduced Coupling

Radiation Characteristics of Antennas on the Reactive Impedance Surface of a Circular Cylinder Providing Reduced Coupling

... the surface of a circular cylinder separated by a corrugated structure with constant depth of ...the surface of a circular ...without impedance flanges for the cylindrical configuration with a ...

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A Varactor-Tunable High Impedance Surface for Active Metamaterial Absorber

A Varactor-Tunable High Impedance Surface for Active Metamaterial Absorber

... A conventional mushroom-type HIS consists of small metal patches with grounding vias. This metasurface can be modeled as a parallel LC resonant circuit, as shown in Fig. 1(b), where the effective inductance L results ...

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Evaluating the Electromagnetic Surface Wave of High Impedance Structures by Monopole Antenna and Application for Patch Antennas at Q Band

Evaluating the Electromagnetic Surface Wave of High Impedance Structures by Monopole Antenna and Application for Patch Antennas at Q Band

... High Impedance Surface or HIS is a metamaterial structure [1-4] formed by periodic metallic unit cells on a dielectric ...effective surface impedance of HIS is very high, therefore, the ...

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Suitable Impedance Boundary Condition Applied to the Enhancement of the Electric Field Radiated by a High Frequency Surface Wave Radar

Suitable Impedance Boundary Condition Applied to the Enhancement of the Electric Field Radiated by a High Frequency Surface Wave Radar

... curved surface but still assuming a ground with a large ...General Impedance Boundary Condition (GIBC) to model a dielectric medium which can propagate more than one surface wave as, for example, a ...

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