Umberto Pisani

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This paper describes a new procedure aimed to improve the effectiveness of real-time load-pull calibration. Loadpull measurement accuracy is strongly affected by calibration residual uncertainty. The novel methodology reduces this uncertainty contribution by means of error terms optimization. The proposed method has been tested with simulations and applied(More)
In this paper, some of the latest advances in real-time load-pull technologies will be described. A recently introduced ultralow-loss directional coupler, which has been designed and realized by the authors, provides a number of advantages when used in load-pull test sets. This device has been called the load-pull head. The new ultralow-loss load-pull head(More)
This paper describes a new approach for fast and accurate determination of the source reflection coefficient in microwave source-pull measurements. To the authors' knowledge, this is the only technique that allows the simultaneous measurement of the source and the device-under-test input reflection coefficients. A traditional vector network analyzer is used(More)
The Sky Polarization Observatory (SPOrt) is presented as a project aimed to measure the diffuse sky polarized emission, from the International Space Station, in the frequency range 20–90 GHz with 7◦ of HPBW . The SPOrt experimental configuration is described with emphasis on the aspects that make SPOrt the first European scientific payload operating at(More)
The worldwide diffusion of wireless telecommunication systems opened new perspectives for microwave technologies. High-volume microwave monolithic integrated circuit (MMIC) production became a reality, revolutionizing the approach to microwave-circuit design. Nowadays, this is based on the intensive use of accurate simulation and computer-aided-design (CAD)(More)
We present the cosmological and astrophysical objectives of the SPOrt mission, which is scheduled for flying on the International Space Station (ISS) in the year 2002 with the purpose of measuring the diffuse sky polarized radiation in the microwave region. We discuss the problem of disentangling the cosmic background polarized signal from the Galactic(More)
Among the different techniques for the network analyser calibration, the authors recently introduced the NR procedure based on the concept of transfer standard, characterised by primary laboratories. The paper presents the theory assumed to properly design that standard and some experimental results to verify the accuracy obtained by this calibration.
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