Vol 49, No 11, 23 May 2013

  • Manuel Bandala-Sanchez

    Manuel Bandala-Sanchez

    Dr Manuel Bandala-Sánchez from the Center for Engineering and Industrial Research in Mexico talks about the research behind his paper ‘Fringing capacitance in sections of circular parallel plates with variable overlapping area'

  • Microwave energy harvesting demonstrator

    Broadcast energy

    Microwave energy harvesting in broadcast satellites

  • Birefringence can hamper the accuracy of optical fibre sensors

    Spinning into control

    Optical fibre current sensors overcome birefringence

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Making space

Researchers in Japan demonstrate a fan-out device using small diameter fibres for a 7-core single-mode multicore fibre (MCF). The compact device achieves physical-contact connection with a low 0.17 dB connection loss and high return loss of over 49 dB. They have confirmed it has the optical characteristics needed for the construction of MCF transmission systems using a 1000-km transmission.

Odd one out

A new asymmetric magnetic unit for three-phase inductive power transfer that effectively eliminates the ‘dead spot’ is proposed in work from China. The asymmetric design, in which the spiral direction of any one of the three primary coils is opposite to that of the other two, allows the output power to be increased.

Small and speedy

Researchers in China have presented a low noise amplifier with moderate gain and excellent input matching by using a gate-drain transformer feedback and current re-use technology. Compared with conventional designs, their work achieves a similar performance with a greatly reduced silicon area, improving ultra-high speed data links at the millimetre wave range.

Off the peg

Work from the UK shows how a converter that can boost the output voltage of a thermo electric generator (TEG) to usable voltages can be made using easily available components without having to resort to bespoke integrated circuits. The circuit also matches the converter input resistance to the TEG source resistance to optimise the power obtained.

Transforming modelling

Modelling physical devices with transformers is a common technique and researchers in Italy have improved this process in three ways: full characterisation of the class of inductive two-ports; the clarification of some important features concerning the perfect coupling mode of operation; and the identification of another type of perfect coupling.

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