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This paper presents a novel 3D-printed low-cost, light weight, broadband and high gain planar graded index (GRIN) lens. The GRIN lens was designed to transform spherical wavefronts into planar wavefronts which can be used for antenna gain enhancement. Fused deposition modelling 3D-printing was used to fabricate the lens in a single process with bespoke radially varying relative permittivity. Measured...
3D-printing has been used for rapidly prototyping a low-cost and light-weight dielectric zone plate Fresnel lens (FL). This lens was comprised of four dielectric zones and they were fabricated in one process with the tailored permittivities. Measurements show that this lens provides 7.3 to 12.8 dB gain enhancement over the frequency band from 8 to 12 GHz.
Effects of using air voids to vary the effective permittivity of Acrylonitrile-Butadiene-Styrene (ABS) TP20280 thermoplastic filament have been investigated. Measurements of the relativity permittivity and loss tangent of 3D printed substrates with different infill fractions have been made. A 3D printer has been used to manufacture heterogeneous antenna substrates, allowing for extra degrees of design...
This paper presents a compact and flexible embroidered spiral antenna that can be used for wearable applications. The antenna is embroidered by using a state of the art digital embroidery machine with multi-strand conducting thread Liberator™. The antenna has been measured on a Specific Anthropomorphic Mannequin (SAM) phantom and a real human. The measurement results show that the SAM phantom emulates...
This paper presents the design of a 3D-printed flat graded-index lens based on ray optics. The lens is comprised of several concentric dielectric rings with bespoke relative permittivities for transforming spherical waves into plane waves. 3D-printing was used to fabricate this lens with graded and tailored dielectric properties in a single process. The 3D-printed flat lens is low-cost and light-weight,...
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