Joni Vehmas

TL;DR: It is shown, both theoretically and experimentally, that full-power reflection with general control over the reflected wave phase is possible with a single-layer array of deeply subwavelength inclusions, and it is proved that it is possible using electrically and magnetically polarizable inclusions.

TL;DR: The propagation channel in the Helsinki airport at 15, 28, and 60 GHz bands is characterized by means of directional wideband channel sounding and the radio environment was characterized by studying the specular propagation paths, specular and diffuse power contributions, polarization, and the delay and angular spreads.

TL;DR: In this article, a novel transmission-line cloaking design operating at microwave frequencies is presented with special emphasis in the design placed on ease of manufacture and practicality, and the operation of the cloak is verified by studying the antenna blockage caused by the cloaked and uncloaked objects.

TL;DR: In this article, the authors introduce the concept of ideal conjugate matched layer (CML), which fully absorbs the energy of both propagating and evanescent fields of sources acting as an ideal sink for electromagnetic energy.

TL;DR: In this article, the authors present measurements of a transmission-line network, designed for cloaking applications in the microwave region, which is used for channelling microwave energy through an electrically dense array of metal objects, which are basically impenetrable to the impinging electromagnetic radiation.