Design of dual-band bandpass filters for space applications Philippe Lenoir, Stéphane Bila, Dominique Baillargeat, Serge Verdeyme Abstract -- This paper presents a method for the synthesis of dual-band bandpass microwave filters. The dual-band characteristic function is constructed initially from two single-band characteristic functions and a procedure is applied to correct the poles and zeroes po

600 GHz waveguide mixer fabricated by combined conventional and silicon micromachining Jan Schür1 Stepahn Biber', Oleg Cojocari2, Cezary Sydlo2, Lorenz-Peter Schmidt', Hans L. Hartnagel2 Abstract -- In this paper we present the results of a GaAs Schottky diode waveguide mixer manufactured by a combination of conventional micromachining and silicon etching technology. We discuss the field simulatio

22 GHz channel and VLBI system focalization solution for the new 40 m radiotelescope of the national observatory of Spain Enrique Garcia, Créidhe O'Sullivan', Daniel Segovia-Vargas, Eva Rajo-Iglesias Abstract -- This paper presents an optical solution for the 22 GHz channel and the Very Large Base Interferometry layout Astronóm(VLBI) of the new 40 m radiotelescope of the Centro ic de Yebes (CAY).

The shrinking RF front-end Peter Wright Abstract -- Cellular handsets are the biggest market for RF semiconductors and have been evolving at a breath-taking pace from voice-only devices into all encompassing communications/entertainment consoles. Simultaneously, they have shrunk in size, going from utilitarian functional blocks, which were hidden in briefcases, to stylish devices that people are o

Reconfigurable RF receiver studies for future wireless terminals Dariusz Pienkowski l , Ralf Kakerow2, Georg Boeck' Abstract -- In this paper RF-front-end architectures and technologies for reconfigurable mobile terminals of future mobile communication systems (4G-systems) are presented. The studies are based on favourable standard combinations as e.g. WCDMA and WLAN. RF front-end key components l

Integrated piezoelectric LTCC varactor Mahmoud Al Ahmad' '2, Ruth Maenner', Richard Matz', Peter Russer2 Abstract -- The need for reconfigurable/tunable front-end components is particularly arising due to the increasing number of air interface standards and frequency bands. A modified parallel-plate capacitor with high permittivity dielectric and piezoelectrically movable top electrode is identifi

Hybrid tunable microwave devices based on Schottky-diode varactors Emmanuel Pistono2, Anne-Laure Perrier', Raffi Bourtoutian', Darine Kaddour', Akil Jrad3, Jean-Marc Duchamp2, Lionel Duvillaret2, Didier Vincent'', Anne Vilcot', Philippe Ferrari' Abstract - In this paper, tunable RF/microwave devices are demonstrated. First, a phase shifter is carried out, based on a modified classical topology. Th

Guest Editorial Georg Fischer', Clemens Ruppel2 The big challenge in today's development of front-end solutions for cellular communication terminals is the increased number of air interface standards and frequency bands to be dealt with, as well as the pressure for further miniaturisation and reduction of costs. Different approaches with respect to the necessary partitioning of the frond-end have

Front-end requirements for MIMO communication systems Christiane Kuhnert, Stephan Schulteis, Christian Waldschmidt, Werner Wiesbeck Abstract -- Future cellular communications will be enhanced by smart antenna techniques employing multiple antennas at both sides of the link. These multiple input multiple output (MIMO) systems combine antenna arrays and a sophisticated signal processing. Due to new

Concept of balanced antennas with load-invariant base impedance using a two element LC-coupler Norbert Peters, Thomas Schmitz, Arash Sadeghfam, Holger Heuermann Abstract -- This paper presents the design methodology and results of a so-called balanced antenna, adapted from a new concept to realize a balun and 90°-coupler, with two symmetrical antennas. The novel matching structure features invaria