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Two SOA-based coupled optoelectronic oscillators (COEO) at 30 GHz and 10 GHz have been studied. These systems have been designed thanks to a preliminary study of the noise of various optical amplifiers (SOA and EDFA). The COEOs measured single sideband phase noise level is −132 dBc/Hz and −125 dBc/Hz at 10 kHz offset from 10 GHz and 30 GHz respectively. The architecture proposed enabled a rejection...
The performance of a delay line discriminator dedicated to the characterization of high spectral purity lasers is investigated. The system noise floor is obtained using a symmetrical delay. The vibrations are one of the main problems with this approach at the low frequency offsets. However, the system is able to characterize commercially available narrow linewidth lasers, such as external cavity lasers...
This paper summarises the results of GT-RF international key comparison CCEM.RF-K24.F for the measurement of E-fields at selected frequencies between 1 and 18 GHz at field strengths between 10 and 100 V/m with particular emphasis on dealing with the drift in one of the traveling standards. It is shown that, despite the drift, there was good agreement between the participants' results.
Solar Array Regulators (SAR) in a satellite Power Conditioning Unit (PCU) are implemented to transfer the power during sunlight from the solar arrays to the power bus. The objective of this paper is to present how Buck Boost Regulators (B2R) could be used as Step-Up, Direct Energy Transfer and Step-Down Solar Array Regulators. Control circuitries of a new kind are introduced for regulated and unregulated...
Preliminary structures and performance results of two different 60 GHz band planar phase shifters using liquid crystal (LC) are presented. The first phase shifter is based on a meandered microstrip line structure with the conductor pattern exposed to a layer of a nematic LC, while the second phase shifter is based on the reflection type microstrip line phase shifter structure whose tunable reflective...
Mild cognitive impairment (MCI) refers to the clinical state of subjects who suffer from some degree of cognitive deterioration but do not meet clinical criteria for dementia. The aim of this study was to analyze the magnetoencephalogram (MEG) background activity in MCI subjects using two connectivity measures: coherence and synchronization likelihood (SL). Our results showed that coherence and SL...
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