Using the freedom of design that metamaterials provide, we show how electromagnetic fields can be redirected at will and propose a design strategy. The conserved fieldselectric displacement field D, magnetic induction field B, and Poynting vector…
Antennas and Propagation
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We show that microstructures built from nonmagnetic conducting\nsheets exhibit an effective magnetic permeability μ<sub>eff</sub>,\nwhich can be tuned to values not accessible in naturally occurring\nmaterials, including large imaginary…

A second course in electromagnetics, offering integrated, detailed coverage of the classical topics, from Maxwell's equations to Green's functions. Covers electromagnetic boundaryvalue problems in rectangular, cylindrical, and spherical…

With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even…

The optical properties of materials, such as magnetic metals or magnetic semiconductors, having simultaneously negative electrical and magnetic permeabilities are considered. One finds that the refractive index with respect to vacuum is negative;…

We analyze the reflection and transmission coefficients calculated from transfer matrix simulations on finite lengths of electromagnetic metamaterials, to determine the effective permittivity ͑͒ and permeability ͑͒. We perform this analysis on…

With use of spherical wave functions to describe field, directivity gain G and Q of unspecified antenna are calculated under idealized conditions; to obtain optimum performance three criteria are used, maximum gain for given complexity of antenna…

On interrogation by a plane wave, the backscattering efficiency of a nihility sphere is identically zero, and its extinction and forwardscattering efficiencies are higher than those of a perfectly conducting sphere.

The most uptodate, comprehensive treatment of classical and modern antennas and their related technologiesModern Antenna Handbook represents the most current and complete thinking in the field of antennas. The handbook is edited by one of the most…

We demonstrate a composite medium, based on a periodic array of interspared conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective…

A recently published theory has suggested that a cloak of invisibility is in principle possible, at least over a narrow frequency band. We describe here the first practical realization of such a cloak; in our demonstration, a copper cylinder was…

We discuss the validity of standard retrieval methods that assign bulk electromagnetic properties, such as the electric permittivity epsilon and the magnetic permeability mu, from calculations of the scattering (S) parameters for finitethickness…

The use of GPS receivers in wireless telephones has been proposed as a means of automatically identifying the position of wireless 911 callers.GPS simulators are an efficientmeans of testing the accuracy of such technology but require a channel…

Despite growing evidence that increased brainderived neurotrophic factor (BDNF) and hippocampal adult neurogenesis are necessary for the behavioral actions of antidepressants in rodents, the cellular mechanisms involved in these effects are still…

We propose an improved method to retrieve the effective constitutive parameters (permittivity and permeability) of a slab of metamaterial from the measurement of S parameters. Improvements over existing methods include the determination of the first…

To address the need for fundamental universally valid definitions of exact bandwidth and quality factor (Q) of tuned antennas, as well as the need for efficient accurate approximate formulas for computing this bandwidth and Q, exact and approximate…

Planar twodimensional (2D) and volumetric threedimensional (3D) metamaterialinspired efficient electricallysmall antennas that are easy to design; are easy and inexpensive to build; and are easy to test; are reported, i.e., the EZ antenna…

In this paper, a new approach for the development of planar metamaterial structures is developed. For this pur pose, splitring resonators (SRRs) and complementary splitring resonators (CSRRs) coupled to planar transmission lines are investigated.…

A survey of microstrip antenna elements is presented, with emphasis on theoretical and practical design techniques. Available substrate materials are reviewed along with the relation between dielectric constant tolerance and resonant frequency of…

Recent efforts by several researchers around the world to combine fractal geometry with electromagnetic theory have led to a plethora of new and innovative antenna designs. In this report, we provide a comprehensive overview of recent developments…
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