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Microwave imaging is a rapidly evolving modality. Microwave imaging systems have had clinical trials, but these typically require a lengthy regulatory approval process, numerous volunteers, and healthcare professionals. To allow for rapid yet realistic evaluation and refining of microwave imaging algorithms and systems, high-quality phantoms that mimic both the complex structure and dielectric properties...
In this paper we present the design of an antenna, operating in the Ku-band, conceived for wireless power transfer systems. It comprises an hemispherical dielectric lens, fabricated using 3D printing technology, fed by a microstrip patch antenna array. The conjugation of the dielectric lens with the microstrip patch array allows the development of a compact high gain antenna. The antenna presents...
Nowadays 3D printers are useful for the development and rapid prototyping of dielectric structures for radiation manipulation and support of antennas. This is possible since the materials used in this machines are essentially dielectric. These can be used as radiating elements (dielectric resonators), as radiation handlers (lenses) or as a supporting base for applying conductive material to radiation...
A gradient index dielectric metasurface composed of air holes of different dimensions in a bulk dielectric, is fabricated by three-dimensional (3D) polyjet printing and is combined with inductive and capacitive copper grids to have an LC resonance. The latter metal-dielectric metasurface is then used as a phase-gradient superstrate in a Fabry-Perot cavity at microwave frequencies. Performed simulations...
The use of 3D-printing based on extrusion depositing technologies for electromagnetic applications (such as dielectric antenna design or human mimicking tissues) is increasing as a low cost alternative to other small-scale fabrication technologies. As a result, it is of utmost scientific interest to know the exact dielectric properties of commercially available printable materials, such as polylactide...
This paper presents the recent advances in the implementation of substrate integrated waveguide (SIW) components and circuits by additive manufacturing (AM) techniques. The use of AM allows introducing novel features in the design of SIW structures, ranging from fully three-dimensional geometries (impossibly to obtain with standard planar circuits technologies), to the local modification of the dielectric...
A proof of concept 3D printed planar inverted F antenna (PIFA) using Aerosol Jet Additive Manufacturing technology is presented. The cellphone handset PIFA presented in [1] for the 800 and 1900 MHz bands is scaled to 36.5 and 74.5 GHz. The simulated results yield return losses of 17.8 and 20.4 dB at 36.5 and 74.5 GHz, respectively. The maximum theta-pol realized gain is 2 dBi at both frequencies,...
In this paper we present a novel design tool for the generation of graded dielectric structures via additive manufacturing. Space filling curves are utilized to create tool paths ideal for the additive manufacturing (AM) processes. Fused deposition modeling (FDM) was utilized to print spatially varying structures resulting in a spatially varying relative permittivity. A wide range of varying fill...
A new fabrication process for passive terahertz components is introduced. Molds are 3D printed on a commercially available 3D printer using rigid opaque material Vero White. An injection molding machine is used to melt low density polyethylene (LDPE) and high density polyethelene (HDPE) pellets to fill the molds. Sample components are designed in ANSYS HFSS and fabricated using the new process including...
This paper will review techniques of manufacturing wearable antennas. 3D printing can be used to create flexible substrates. 3D shapes can be created which can be used to reduce the antenna size. Embroidery will also be discussed. The technique naturally lends itself to linear antennas.
In this paper, an all-dielectric frequency selective surface (ADFSS) was developed using genetic algorithms and fast Fourier transforms (FFTs) to generate random geometries. This device showed a stop-band fractional bandwidth (FBW) of 54% and a field of view of 16°. The optimized FSS was manufactured by three-dimensional (3-D) printing and the frequency response was measured in the laboratory. This...
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