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A high‐dielectric‐constant and flexible cellulose nanopaper composite is prepared by mixing a small amount of silver nanowires with cellulose nanofibers. The nanopaper antenna is downsized by about a half when using the nanopaper substrate. The nanopaper antenna has potential in wearable wireless communication devices.
High-dielectric materials have played essential roles in various electronic applications such as capacitor, transistor, antenna and pressure sensor. In recent years, paper has attracted much attention as a potential substrate for low-cost flexible electronics. However, the dielectric constant (k) of conventional paper is low due to the high porosity of paper and the low k value of air (k≈1). Here...
Dramatic spread is going on high frequency operation device, such as mobile phones, wireless LAN, and radio frequency identification (RFID). Especially, the antenna is the most important element in the high-frequency operation device, and has been studied around the world. The printed antenna on flexible substrate is remarkable, since such printed antenna package is thinner, lighter and cheaper than...
We studied the high-frequency characteristics at 0.5–1.5 GHz of mask-printed silver paste lines with different filler sizes (nanoparticles or micro-sized flakes) and an etched copper foil on glass fiber reinforced epoxy substrate. Although the resistivity of silver-nanoparticle lines was 10 times larger than that of the etched copper foil, its return loss was almost equal to that of the etched copper...
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