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• W3048227564 abstract "In this paper, an inkjet-printed 2-element patch antenna array was printed on silica coated porous polyethylene terephthalate (PET) with compatible silver ink formulation. Printing on mesoporous surface with optimized drop spacing (18 μm) provided the advantages of eliminating the coffee ring effect, resulting in low surface roughness/waviness of printed ink and good adhesion of ink to the substrate for better mechanical reliability. Control over the flow of dispensed ink allowed printing well-defined structure boundaries with thickness of ~1.6 μm in a single pass. By using laser sintering, high conductivity of printed ink (~ 0.3 times of bulk silver, 2.07 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>7</sup> S/m) was obtained, minimizing the ohmic losses. A reliable printed structure was achieved by optimizing the sintering process to maintain flexibility among nanoparticle connections, as well as an optimal level of organic binders in the ink to preserve its adhesion with the porous substrate. This structure maintained its structural and performance integrity after mechanical stress cycling.The printed antenna system, after sintering at different laser powers, was subjected to tensile bending for 500 cycles over a 2.5 mm radius mandrel applying a bending strain of ~3.74%. The S <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>11</sub> performance of the antenna was measured in flat (reference plane) and bent positions. The printed antenna pattern laser sintered at 150 mW laser power with scanning speed of 10 mm/sec. underwent minimal shift in resonance frequency (40 MHz shift) and minimal change in return loss measurements of 0.21 ± 0.01 dB (at resonance frequency) compared to its initial measurements. Overly high-power laser sintered structures showed high damages and degraded performance due to crack formation in printed ink." @default.
• W3048227564 created "2020-08-13" @default.
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• W3048227564 date "2020-06-01" @default.
• W3048227564 modified "2023-10-18" @default.
• W3048227564 title "Flexible inkjet-printed Patch antenna array on mesoporous PET substrate for 5G applications with stable RF performance after mechanical stress cycling" @default.
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• W3048227564 doi "https://doi.org/10.1109/ectc32862.2020.00285" @default.
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