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Errors occur in the process of digital printing of frequency selective screens using conductive inks. This paper describes some of the defects observed during the printing process and investigates their effect on the resonance frequencies of arrays that might be fabricated in practice. The elements are simple linear dipoles. The presence of the classes of error described would be serious in the case...
Deploying wireless systems so that they offer the best performance for all stakeholders (e.g. users, service providers and shareholders) is identified as a critical issue in advancing the wireless industry into the second decade of the twenty-first century. An historical perspective of the key issues is initially presented, from which a set of societal expectations of future wireless performance are...
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...
The application of a novel biasing technique to tune frequency selective surfaces (FSS) made of patch elements is described. The methodology follows a recently developed technique where the biasing circuit of an active FSS is etched at the rear of a double sided substrate. On this occasion, the structure consists of dipole patches on one side of the thin polyester substrate and the biasing circuit...
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