New Developments and Applications in Sensing Technology by Julien Kerouedan, Patrick Quéffélec (auth.), Subhas Chandra

By Julien Kerouedan, Patrick Quéffélec (auth.), Subhas Chandra Mukhopadhyay, Aimé Lay-Ekuakille, Anton Fuchs (eds.)

This ebook has focussed on assorted features of clever sensors and sensing expertise, i.e. clever dimension, details processing, adaptability, recalibration, info fusion, validation, excessive reliability and integration of novel and excessive functionality sensors within the components of magnetic, ultrasonic, imaginative and prescient and picture sensing, instant sensors and community, microfluidic, tactile, gyro, move, floor acoustic wave, humidity and ultra-wide band. whereas destiny curiosity during this box is ensured via the consistent offer of rising modalities, suggestions and engineering options, in addition to an expanding desire from getting older buildings, a number of the uncomplicated thoughts and methods have already matured and now supply possibilities to construct upon.

The ebook has basically been focussed for postgraduate and study scholars engaged on assorted points of layout and advancements of shrewdpermanent sensors and sensing technology.

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Looking at Figure 18 one can see that the vector fields radiate perpendicular to the PCB in most cases. A result of this is the drop in radiated power shown in Figure 16(b) in the xz plane at 0°, because directly above the antenna there is a polarisation mismatch, whilst there is an increase shown nearer the edges of the board. At the edges of the PCB the electric field appears to change direction so that it is nearly orthogonal to the field in the centre. This indicates that the polarisation of the electric field is not strictly linear, as is the case with the monopole antenna.

These results show that the monopole antenna experiences heavy packet loss when it is orientated in the xy plane, even at a distance of just 2m. As the distance increases this packet loss varies greatly, and on numerous occasions peaks at over 50% loss. For the FCPW antenna however, packet loss does not appear to occur at all until a distance of 11m, and even then it is not as pronounced as that experienced by the monopole antenna. It is thought that these results are due to the FCPW antenna having an elliptical polarisation, as discussed in Section 4.

Looking finally at the most exciting results from the FCPW antenna, shown in Figure 16(b), this antenna is much more tolerant of polarisation mismatch than the monopole antenna. In the xy plane there is typically a 2-3dB loss when compared with the monopole measurements shown in Figure 15(b); the same reductions in radiated power are present at the 90° and 270° positions. These reductions apply to the yz plane also. 05dB which is more than experienced by the antenna in the Figure 16(a). So, the question is, why does the FCPW antenna exhibit such results?

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