This paper describes an experiment to investigate the influence of luminance distribution on perceived brightness in interiors. Thirty subjects matched the brightness of mock offices using a dimmer. Two of the four mock offices used in the experiment had relatively uniform luminance distributions, created by ceiling fluorescent lighting equipped with K-12 acrylic lenses. The other two offices h...

Dielectric lenses can substantially improve antenna parameters, especially the planarity of radiated waves and the antenna gain. The paper deals with their application in millimeter-wave band. The main goal concerns the introduction of characteristics and differences between the most commonly used types of dielectric lens antennas, i.e. elliptic and hyperbolic. Their particular features as well...

The far-field angular response pattern for dipole antenna-coupled infrared detectors is investigated. These devices utilize an asymmetric metal-oxide-metal diode that is capable of rectifying infrared-frequency antenna currents without applied bias. Devices are fabricated on both planar and hemispherical lens substrates. Measurements indicate that the angular response can be tailored by the thi...

We describe a means for improving the coupling of illumination to, and the collection of scattered radiation from, an optical antenna. This is achieved by integrating optical antennas with concentric ring gratings. Electromagnetic simulations demonstrate that the ring grating improves the coupling to the antenna, even if the incident illumination is focused by an aplanatic lens such as a micros...

1 Laboratory for Social and Neural Systems Research, Institute for Empirical Research in Economics, University of Zurich, Zurich, Switzerland, 2 Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, United Kingdom, 3 The Rotman Research Institute, Baycrest Center, Toronto, Ontario, Canada, 4 School of Engineering and Science, Jacobs University Bremen...

This paper outlines a new algorithm of neural optimization for viable CAD of complex antenna structures. The input impedance (return loss) and radiation pattern are optimized with respect to the same design variables by a decomposed RBF neural network capable of dealing with various antennas accessible for 3D FDTD analysis. The algorithm features the dynamic generation of as much FDTD data as t...

The performance of quasi-optical (QO) SIS mixers designed for operation around 1 THz is evaluated. Mixers incorporating Si elliptical lens with either double slot-line or double dipole antennas with back reflectors have been fabricated and measured. Nb/AlAlOx/Nb superconductor-insulator-superconductor (SIS) tunnel junctions are integrated with a NbTiN-SiO2-Al microstrip circuit to tune out the ...

A Doppler lidar system for wind velocity and direction measurement is presented. The lidar use a wide field of view (FOV) objective lens as an optical antenna for both beam transmitting and signal receiving. By four fibers coupled on different position on the focal plane, the lidar can implement wind vector measurement without any scanning movement.

In this paper, we present the calculation of the effective parameters of an artificial medium made of planar conducting obstacles. The evaluation of both the effective permittivity and of the effective permeability is addressed here. It is well known that this type of artificial medium exhibits anisotropy. One possible application for this artificial medium is the fabrication of non-homogeneous...