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The new services available through smart devices require very high cellular network capacity. The capacity requirement is expected to increase exponentially with the forthcoming 5G networks. The only available spectrum for truly wideband communication (>1 GHz) is at millimeter wavelengths. The high free space loss can be overcome by using the directive and beam-steerable antennas. This paper describes a design and the measurement results for a lens antenna system for E-band having 2-D beam-steering capability. Continuous beam-switching range of about ±4°*±17° is demonstrated with the lens having the maximum measured directivity of 36.7 dB. Link budget calculation for backhaul application using the presented lens antenna system is presented and compared with the measurement results of the implemented demo system.

This paper presents the most common thermal characterisation methods for semiconductor diodes and discusses why thermal characterisation is important for the diode reliability assessment. A special case of thermal characterisation of THz frequency Schottky diodes for MetOp Second Generation (MetOp-SG) satellite program instruments is covered in more detail. The benefits of accurate thermal characterisation in this case are explained and the drawbacks of unknown self-heating are discussed

This paper presents a fast, accurate and easy to use measurement method to extract two parameters of the dielectric material (permittivity and loss tangent) in the frequency range of 75 to 325 GHz. The reflection and transmission S-parameters are measured using a network analyzer and then are compared with the simulated plots from the full wave simulator (HFSS) to obtain the permittivity and the loss tangent of the test material. The proposed topic for the paper is Device modeling and characterization and the proposed type of presentation is poster.

This document presents an approach to the phase centre determination of a dielectric rod waveguide (DRW) antenna by means of measurements obtained with a planar measuring system at millimeter wave lengths. Phase centre determination by the least squares fit technique is described in this document for different DRW antennas (silicon and sapphire). Results at different operating frequencies are offered.

We have constructed a demonstrative compact antenna test range (CATR) and tested its performance at 650 GHz. An amplitude hologram of 0.93 meter in diameter was used as the focusing element of the CATR. The measured amplitude and phase ripples in the quiet-zone are ca. 2 dB and 15°, peak-to-peak. Good measurement results indicate that the hologram based CATR is applicable also for high submillimeter wave frequencies.

Computer-generated holograms can be applied in space terahertz technology; they are particularly suitable as focusing elements in compact test ranges, for example, in testing of high-gain antennas and measuring radar cross section (RCS) of scaled models. Radio holograms have also been demonstrated in other millimeter- and submillimeter-wave beam-shaping applications, such as the creation of non-diffracting mm-wave Bessel beams, mm-wave vortices, and custom-designed beam patterns. During summer 2003 we built a temporary measuring facility at the High Voltage Institute of the Helsinki University of Technology to test the ADMIRALS antenna built by EADS Astrium. The measurement results obtained at 322 GHz are so promising that we are currently proposing a hologram CATR test for the Planck telescope at 500 GHz.