Three different mechanisms, namely
reflection loss (R), absorbance loss (A), and internal reflections loss (or multiple internal reflection-MR), may contribute to overall attenuation of the electromagnetic field.
Protective materials with
reflection loss using intrinsic conductive polymer (ICP) are very promising.
"Our approach involved concentrating light onto small, high-efficiency solar cells using plastic lenses and we needed to minimise their
reflection loss," Mr Giebink explained.
The basic requirement of the microwave absorption materials is to show strong microwave absorption, represented by
reflection loss [9].
By employing periodic nanostructured dielectric arrays on 40 f m thin c-Si, they could suppress the
reflection loss below 5% over a wide spectra and angular range and demonstrated 32% improvement in short circuit current and 44% relative improvement in energy conversion efficiency in a crystalline silicon solar cell with only a 2.9 [micro]m ultrathin absorber layer.
The difference in received power between the metal plate and object under testing was transformed into a
reflection loss in dB.
In that structure, a composite of carbon fibers that are constructed in the form of vertical-arranged carbon fibers and carbon-fiber felt screens can achieve a
reflection loss below -20 dB in the range of 11.8-18 GHz.
Caption: Figure 16: Radiation pattern and input
reflection loss comparison for various window widths.
In addition, better than 10dB
reflection loss is realized every time at the resonant frequency as shown in Fig.