Broadband planar ring mixers with DGS-Marchand baluns in the millimeter wave frequency range Robert Rehner, Dirk Schneiderbanger, Michael Sterns, Siegfried Martius and Lorenz-Peter Schmidt Abstract -- Planar hybrid ring mixers in the millimeter wave range for frequencies up to 80 GHz are presented. They exhibit conversion losses lower than 15 dB up to frequencies higher than 70 GHz, with a very wi

Analysis, fabrication, and measurement of frequency-selective helix layers Christian Meiners' and Arne F. Jacob2 Abstract -- We investigate layers composed of copper helices. Thereby, the positions of left- and right-turned helices form a chessboard-like pattern. In this manner, cross-polarized field components which are inherent to helical particles cancel out. The main focus is on periodic layer

A tunable directional coupler Thomas Zelder, Bernd Geck, Ilona Rolfes and Hermann Eul Abstract -- In this paper a tunable directional coupler is presented. The tunable coupler consists of a conventional directional coupler in combination with a tunable network. By tuning the network, the directivity of the conventional coupler can be increased significantly, where an ideal match is needed to deter

2-dimensional ultra-wideband antenna array for amplitude monopulse angle of arrival estimation Marcel D. Blech', Michael O. Benzinger2 and Thomas F. Ebert' Abstract -- A 2-dimensional ultra-wideband (UWB) antenna array for amplitude monopulse 2-dimensional direction finding is presented. The single antenna elements are a dielectric rod antenna excited by a conical dipole and a monotone antenna enc

Uplink and downlink performance analysis of OFDM signals in hybrid radio-over-fiber (RoF) links Mikael Gidlund 1 Abstract -- With the increasing demand for high data-rates in wireless networks, Radio-over-Fiber (RoF) systems could be a good candidate for physical layer infrastructure in the development of high speed wireless LANs (WLANs) in the future. One of the major limitations of RoF links in

Simulation experiment on optical modulation of 4H-SiC millimeter-wave high power IMPATT oscillator Moumita Mukherjee', Nilratan Mazumder2 and Arindam Dasgupta3 Abstract -- Simulation experiments on narrow band gap Si, intermediate band gap InP and wide band gap 4H-SiC based single drift IMPATT devices operating at Ka-band clearly establishes the superiority of SiC based device. RF power of 1.1 KW

Radio-over-fibre links for IEEE802.16-2004 WiMAX base stations: applications and field trial demonstration Antonio Ramirez1, Francisca Martinez', Valentin Polo', David Zorrilla', Javier Marti2 Abstract -- This paper describes suitable architectures for the deployment of WiMAX networks employing Radio-over-Fibre (RoF) systems as a low-cost alternative to traditional distribution employing cabled or

5 Low noise amplifiers for D-band Mikko Kantanen', Mikko Kärkkäinen2, Mikko Varonen2, Mikko Laaninen3, Timo Karttaavi', Rainer Weber', Arnulf Leuther4, Matthias Seelmann-Eggebert4, Tapani Närhi , Janne Lahtinen6 and Kari A. I. Halonen2 Abstract -- Four low noise amplifiers for D-band (110-170 GHz) operation are presented. The amplifier circuits have been manufactured using a 100-nm gate length me

Full modelling and simulation of FBAR filters in the GHz range for temperature ageing prediction Brice Ivira', Philippe Benech' and Philippe Ferrari' Abstract -- This paper is focused on the study of the ageing of Film Bulk Acoustic Resonators (FBAR) by comparing simulation and measurement results. This study was carried out in the context of filter applications. After a brief comparison of differ

Design method of balanced AlGaN/GaN HEMT cascode cells for wideband distributed power amplifiers Audrey Martin' , Tibault Reveyrand1 , Michel Campovecchio1 , Raphael Aubry2 , Stéphane Piotrowicz2 , Didier Floriot2 and Raymond Quéré1 Abstract -- A specific design of a GaN HEMT cascode cell dedicated to flip-chip distributed power amplifiers is presented in this paper. The active device used in the