B.P. de Hon

Sub-Millimeter-Wave Imaging Array at 500 GHz Based on 3-D Electromagnetic-Bandgap Material

The design, fabrication, and characterization of a 500-GHz electromagnetic bandgap (EBG) based heterodyne receiver array is presented. The array contained seven planar dipole antennas that were photolithographically defined on a common 20-mum-thick quartz substrate. Each antenna incorporated a Schottky diode and was connected to coplanar transmission lines that conveyed the down-converted 500-GHz signals to detectors. The quartz substrate was backed by a silicon EBG woodpile structure, which reduced antenna crosstalk and increased directivity. An off-axis parabolic mirror completed the beam-forming network.

Design and characterisation of an EBG imaging array at sub-millimetre wave frequencies

In this paper the design and characterisation of an imaging array at 500 GHz based on EBG technology is described. The array is formed by 7 detecting elements placed on a top of a silicon woodpile and uses a paraboloidal mirror as refractive element. Good agreement was obtained between predicted and measured performances.

Computational Techniques for Antenna Engineering

In this paper, a two-stage approach is proposed for using computational electromagnetics in antenna engineering. First, stochastic optimization techniques are used in combination with approximate models. Second, line-search techniques are combined with full-wave modeling. The second stage is considered in detail; both the acceleration of the underlying field computations and the implementation of the optimization are discussed.

Preconditioned Finite-Difference Frequency-Domain for Modelling Periodic Dielectric Structures - Comparisons with FDTD

Finite-difference techniques are very popular and versatile numerical tools in computational electromagnetics. In this paper, we propose a preconditioned finite-difference frequency-domain method (FDFD) to model periodic structures in 2D and 3D. The preconditioner follows from a modal decoupling approximation. Its use involves discrete Fourier transforms (via FFTs). We have set FDFD against an FDTD package for a typical test case, with identical spatial grids. We have observed that computation times for a full frequency sweep are comparable, while the accuracy is slightly better with FDFD.