Follow the links to read the full papers in the IET Digital Library.
Filters turn super
Researchers in China have developed a method for tuning superconducting filters, offering a frequency range of the resonator larger than that using conventional dielectric or metallic tuning screws. Their method is capable of both increasing and decreasing the resonant frequency of resonators, while introducing very little loss.
Finding a pulse
A balanced pulse generator with pulse repetition frequency up to 500 kHz, high voltage amplitude and pulse width in the picosecond region has been presented by researchers in China. Among several applications, the technique has been used for non-contact heartbeat and breath detection through media – such as ground - for deployment in rescue operations.
A laser fired contact method was used to form localised back contacts on the back side of solar cells in work from China. Localised point back contacts with varying dot diameter and spacing were formed and cell performance characterised from solar simulator measurements. Dot spacing was found to be more crucial to cell
performance than diameter variations.
Visible from space
ESA researchers present work on the use of signals transmitted by Global Navigation Satellite Systems (GNSS) as a tool for earth remote sensing. They compare two categories of GNSS-Reflectometry processing techniques by introducing a
generalised decomposition of the cross-correlation waveform and looking at for what applications each method is better suited.
A touch of truth
A technique for fingerprint spoof detection based on using spatial features in order to analyse the texture of the fingertip surface is presented in work from Brazil. Called Spatial Surface Coarseness Analysis (SSCA), the approach significantly improves average classification error for a very common biometric security technology.