We adopt a multidomain pseudospectral method to analyze lamellar gratings for general conical diffraction from TE and TM diffractions. The validity and usefulness of this approach are demonstrated through normal metallic lossy and highly conductive lossless gratings. The developed method provides excellent numerical stability and convergence over commonly used rigorous couple wave analysis (RCW...

A nondiffracting metallic lamellar grating formed from three equally spaced grooves per repeat period, with one being slightly shallower than the other two is examined at microwave frequencies. When filled with a slightly lossy dielectric, this structure supports a remarkably nondispersive surface plasmon polariton mode, which exhibits strong selective absorption of incident power. Measured ref...

We analyze the urban propagation channel through careful investigation of the data obtained from a series of wideband measurements. We try to estimate the wave scatterers in the channel by comparison of the cluster received waves appearing in the directional power delay profiles (PDP) to precise maps of the environments including all present objects. The analysis of the measurement results show...

Metamaterials made up of resonant elements containing lossy metallic conductors will invariably give rise to Johnson noise. A model based on nearest neighbor interaction of magnetically coupled elements is shown to predict the propagation of noise waves and the excitation of resonances in regular arrays. The power spectral density (PSD) of the noise is calculated for rectangular arrays of diffe...

Passive radio frequency (RF) tags in the UHF and microwave bands have recently drawn considerable attention with their great potential for use in inventory management, parcel and postal tracking, as remote sensors, and in a host of other radio frequency identification (RFID) applications [1, 2, 3]. However, much more basic research is needed to increase the range and reliability of a passive RF...

The submillimeter wave or terahertz (THz) band (1 mm-100 microm) is one of the last unexplored frontiers in the electromagnetic spectrum. A major stumbling block hampering instrument deployment in this frequency regime is the lack of a low-loss guiding structure equivalent to the optical fiber that is so prevalent at the visible wavelengths. The presence of strong inherent vibrational absorptio...

Photonic bandgap (PBG) structures constructed from lossy, dispersive dielectric and metallic materials are characterized in terms of their reflection and transmission properties. Particular emphasis is given to PBG structures with defects. These PBG structures are modeled analytically with an ABCD matrix method for their single-frequency response. They also are modeled numerically with a finite...

We consider the problem of amplifying the “lossiness” of functions. We say that an oracle circuit C∗ : {0, 1} → {0, 1}∗ amplifies relative lossiness from `/n to L/m if for every function f : {0, 1} → {0, 1} it holds that 1. If f is injective then so is C . 2. If f has image size of at most 2n−`, then C has image size at most 2m−L. The question is whether such C∗ exists for L/m `/n. This problem...