Vol 49, No 17, 15 August 2013

  • The ASI's antenna and satellite beacon receiver. (Insert): radio wave propagation experiment

    Inside view

    Dr Lorenzo Luini and Prof. Carlo Capsoni from Politecnico di Milano give us the inside view on extracting short integration time rainfall statistics for wireless communication system modelling from widely available coarse rainfall data.

  • Chiara Pelletti (left) and Giacomo Bianconi (right)

    A wide selection

    Frequency selective surfaces are often narrowband and narrow-angle, limiting their use in possible applications. This has been addressed by introducing a guided wave structure, which improves both band and angle response

  • Shusuke Narieda and Tomoya Kageyama

    Shusuke Narieda and Tomoya Kageyama

    Shusuke Narieda and Tomoya Kageyama talk about the research behind their Letter ‘Simple spectrum sensing techniques based on cyclostationarity detection in cognitive radio networks'

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Scratching the surface

Researchers in India have incorporated Barker non-stationary excitation and Hilbert transform based matched filtering for detection of subsurface features in glass fiber-reinforced plastic (GFRP). This pulse compression approach is less affected by random noise and variations in surface emissivity. The method is intended to help detect manufacturing defects in GFRP materials, a problem that has limited the use of these lightweight, stiff and corrosion resistant materials.

In the balance

A frequency-voltage converter circuit for alternating current electrogravimetric measurement based on quartz crystal microbalance oscillators is presented in work from France and Spain. The design improves the sensitivity (19.4mV Hz-1) and bandwidth (1mHz – 1KHz) over previous systems, and experimental results show its reliability. The team believe it will allow development of new applications in the field of electrochemistry.

Back-uo power

An efficient rectenna with vertical ground-walls for RF energy harvesting is proposed in work from Korea. The rectenna consists of a broadband dipole antenna and the rectangular ground plane with two vertical ground-walls. The walls suppress and harvest the back-lobe of the main radiator without disturbing its electrical performance. This significantly reduces the back-lobe and harvests 1.74% of the original input power for use as a supplementary DC energy source.

Surplus harvest

A simple and efficient rectenna design has been presented by researchers in Korea. By using the vertical metallic walls on the ground plane, the proposed rectenna can harvest high level RF energy directly from the radiators, providing a supplementary DC source for communication systems.

Reflecting sense

Researchers in China have designed an antenna that offers a wide operating band, good directional radiation and low cross-polarisation.  These features may allow it to replace conventional ridged horns as sensors in an EMC/antenna chamber, or as a feed for reflector antennas for square kilometre array applications.

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Cover of Electronics Letters, Volume 49, Issue 25

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