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A new frequency reconfiguration technique for the dielectric resonator antenna (DRA) using controllable air gaps under the resonator, is presented. This method provides an alternative to previous DRA tuning techniques, which tend to be bulky or lossy. The fabricated prototype had measured operating frequencies at 21.4 GHz and 16.7 GHz, a tuning range of 24.7%, which can be selected by positioning...
The dielectric resonator antenna (DRA) has several advantages over metallic antennas, which may include low loss and compact design. However, few frequency reconfiguration methods exist for the DRA. This letter proposes, designs, and validates a new frequency-reconfigurable DRA that exploits the air gap effect. Here, air-filled channels are inserted between the DRA and the ground plane, and resonant...
This study compares electromagnetic interference (EMI) shielding properties of injection molded versus compression molded multi-walled carbon nanotube/polystyrene (MWCNT/PS) composites, i.e., properties such as EMI shielding effectiveness (EMI SE), electrical conductivity, real permittivity and imaginary permittivity. The injection molded (MWCNT-aligned) samples showed lower EMI shielding properties...
This article argues that digital games and school‐based literacy practices have much more in common than is reported in the research literature. We describe the role digital game paratexts – ancillary print and multimodal texts about digital games – can play in connecting pupils’ gaming literacy practices to ‘traditional’ school‐based literacies still needed for academic success. By including the...
The designs of a single-fed circularly-polarized (CP) microstrip antenna with switchable polarization and a tunable dielectric resonator antenna (DRA), using metal-plated dielectric slugs, are described. The scheme of micro-pneumatic control of solid slugs presents an alternative to the existing methods in realizing reconfigurable antennas. The radiation polarization of the CP antenna and the resonant...
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