Wireless digital information transfer: Modelling, prediction and assessment

The loop-to-loop pulsed electromagnetic field wireless signal transfer is investigated with a view on its application in wireless digital information transfer. Closed-form expressions are derived for the emitted magnetic field and for the open-circuit voltage of the receiving loop in dependence on the mutual orientation of the loops and the...

THz Leaky Lens Antenna integrated with Kinetic Inductance Detectors

This contribution presents the fabrication and measurements of the leaky lens antenna integrated with a cryogenically cooled Kinetic Inductance Detector, in order to achieve an ultra sensitive THz receivers over a bandwidth ranging from 0.15GHz to 1.5 THz. The system has been manufactured and characterized in terms of power efficiency, and...

Ensemble methods for large scale inverse problems

Variational data assimilation, also sometimes simply called the ‘adjoint method’, is used very often for large scale model calibration problems. Using the available data, the uncertain parameters in the model are identified by minimizing a certain cost function that measures the difference between the model results and the data. A variational...

Array-structure theory of Maxwell wavefields in affine (3 + 1)-spacetime: An overview

An array-structure theory of Maxwell wavefields in affine (3 + 1)-spacetime is presented. The structure is designed to supersede the conventional Gibbs vector calculus and Heaviside vectorial Maxwell equations formulations, deviates from the Einstein view on spacetime as having a metrical structure (with the, non-definite, Lorentz metric), and...

A hybrid electromagnetics-circuit simulation method exploiting discontinuous Galerkin time domain finite element method

A hybrid electromagnetics (EM)-circuit simulation method employing the discontinuous Galerkin finite element time domain method (DGFETD) is developed to model single lumped port networks comprised of both linear and non-linear elements. The whole computational domain is split into two subsystems. One is the EM subsystem that is analyzed by the...

Generalized complex inductance for radiation problems

The concept of generalized complex inductance for the partial element equivalent circuit (PEEC) technique is introduced to model microstrip radiation problems. Using the semi-analytical Greens functions for microstrip substrates, the imaginary part of this generalized complex inductance can be shown to represent a frequency-dependent resistance...

Progress in multiscale computational electromagnetics in time domain

Many system-level electromagnetic design problems are multiscale and very challenging to solve. They remain a significant barrier to system design optimization for a foreseeable future. Such multiscale problems often contain three electrical scales, i.e., the fine scale (geometrical feature size much smaller than a wavelength), the coarse scale ...

Reducing computational workload from electrically large quadratic surface at high frequency

In this paper, we propose a frequency independent approach, the numerical steepest descent path method, for computing the physical optics scattered electromagnetic field on the quadratic parabolic and saddle surfaces. Due to the highly oscillatory nature of the physical optics integral in the high frequency regime, the proposed method relies on...

Wave analysis of Airy beams and Airy Pulsed Beams

The Airy beam (AiB) has attracted a lot of attention recently because of its intriguing features. We have previously provided a cogent physical explanation for these properties by showing that the AiB is, in fact, a caustic of rays that radiate from the tail of the Airy function aperture distribution. We have also introduced a class of ultra...

Generalized-ray theory for electromagnetic fields in layered media

Generalized-ray theory for time-domain electromagnetic fields in a horizontally layered medium is developed. After introducing appropriate integral transformations and source-type field representations in vertically inhomogeneous media, the solution is written out in terms of generalized ray constituents whose space-time counterparts are...