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Low cost fabrication techniques might give rise to defects in electromagnetic structures. This paper investigates the detrimental effect of producing frequency selective screens with differing percentages of absent square loop elements. It is shown that as many as one in five elements can be incomplete before the array transmission response is considered unusable.
The field structure on individual elements of a finite 3×3 double layer FSS for long wavelength is measured in the near field. The transmitted fields are compared at different frequencies and non-uniformities in individual element excitations at different points in the array are observed as indications of finite edge effects in an electrically small array.
Designers of civil communications systems face an increasing strain on the radio frequency spectrum as demand increases. Much high speed data access is required indoors and it is therefore reasonable that future buildings should be designed with wireless communications systems in mind. Buildings could be equipped to offer a controlled propagation environment with isolation of secure data and blocking...
The unit-cell size needed for operation at a given frequency can be reduced dramatically by using highly convoluted and interwoven elements. The dual-polarized designs presented here are based on convoluted loops. The geometry of the convoluted square loop provides a further degree of flexibility in wideband design, enabling adjacent elements to be interwoven. Here, interweaving decreased the resonant...
Simulations of active frequency selective surfaces with diodes capacitively coupling to the surface containing the slots have been presented. The simulations are in line with previously reported measurements. This technique can be applied to circular loop slots but careful design is necessary in order to avoid modifications in the dual polarization behavior of the FSS. A more detailed study of the...
To adapt the Quality Assessment of Diagnostic Accuracy Assessment (QUADAS) to the particular methodological challenges posed by research on ‘-omics’-based diagnostic tests.We generated new guidelines by appraising the suitability of each criterion from QUADAS to ‘-omics’-based diagnostic research, and by adding new items that addressed specific sources of error. In addition, we defined four phases...
In this paper we present array processing techniques used to discriminate between propagating wideband biological signals. Velocity and frequency responses for a circular array designed to enhance nerve signal from a desired direction while rejecting myoelectric signal from any direction are presented. It is shown that delay and sum beamforming can provide limited processing gain for such a wideband...
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