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This work will present the passive waveguide devices developed at CNR-IEIIT aimed at multi-beam scientific instruments operating in the Q and W bands. Layouts of high-performance OMTs, polarizers and marker injectors suitable for medium scale production will be presented. The presentation will focus on the analysis, design, manufacturing and measurements of these components.

This work will present the research activities ongoing at the CNR-IEIIT institute concerning the development of scientific instrumentation for astrophysical surveys. The presentation will focus both on the analysis, design, manufacturing and measurement techniques and on the layouts conceived for a large class of passive waveguide components.

This contribution presents a manufacturing-oriented Ortho-mode Transducer configuration for polarimeter clusters at millimeter-waves. It is based on a turnstile junction with a proper recombination network. All the discontinuities were properly conceived so that the overall geometry can be manufactured in a multi-layer (platelet) fashion, using commercially-available metal layers. All the metal layers can be machined using the spark-erosion technique, which provides high accuracy and high repeatability for a large number of devices. A W-band implementation with standard WR10 output waveguides has been designed in the operative bandwidth 80-108 GHz. The simulated return loss is better than 25 dB in the overall bandwidth for both polarizations. The predicted insertion loss is 0.35 dB at 94 GHz (metal resistivity 10 ??cm). The isolation between the two polarizations is better than 60 dB owing to the symmetry of the device.

Vessel buckling is integrated into oscillometry to determine the continuous mean arterial pressure. A microprocessor based feedback control is utilized to maintain the arterial pressure at the buckling point. The derivative of arterial volume is employed to indicate when the vessel is buckling. Implementation of an automated control loop improves the time it takes to track mean arterial pressure and allows the determination of frequency response parameters. Therefore, tracking of mean arterial pressure (MAP) will allow for the instantaneous determination of arterial pressure by later introducing a second simultaneous control loop.

Vessel buckling is integrated into oscillometry to determine the continuous mean arterial pressure. A microprocessor based feedback control is utilized to maintain the arterial pressure at the buckling point. Implementation of an automated control loop improves the time it takes to track mean arterial pressure and allows the determination of frequency response parameters. Therefore, tracking of mean arterial pressure (MAP) will allow for the instantaneous determination of arterial pressure by later introducing a second simultaneous control loop.