A 60-GHz Ultra-Thin and Flexible Metasurface for Frequency-Selective Wireless Applications

Abstract

This paper demonstrates a design, fabrication and performance evaluation of a frequency selective 60-GHz flexible metasurface in order to facilitate an unobstructed, secure, and low-loss high-frequency signal propagation. The high-attenuation 60 GHz millimeter-wave (MMW) band is selected for the design of a broadband metasurface. The symmetric metasurface unit-cell structure comprises of an assembly of a circular metallic ring embedded with a square-shaped ring. The screen printing process is deployed to perform fabrication of the metasurface on flexible films by means of highly-conductive nanoparticle copper pastes. Electromagnetic (EM) characteristics of the proposed structure are examined by using the quasi-optic bench testing facility in order to validate its potential contribution in the high data-rate communication links. The proposed ultra-thin and flexible metasurface can be integrated on walls and windows as wallpaper to enhance the wireless signal propagation in highly-dense indoor scenarios.

Miniaturized Meander-Line Dipole Antenna For Short-Range Wireless Communication Networks

“…The antenna with a highly compact dimensions of 0.08λo × 0.03λo (where λo is the wavelength at resonant frequency, fo = 288 MHz) is designed on a sapphire substrate (dielectric constant, εr = 9.4, loss tangent, tanδ = 0.0002, thickness, h = 1.5 mm). For metallization, gold, silver, or copper pastes can be used as several variants of these pastes are commercially available [7,8]. Frequency tuning can be done by reconfiguring the antenna geometry using aluminum (Al) wire bonding connections.…”

Thermal Transport in Extremely Confined Metallic Nanostructures: TET Characterization

“…, where V 0 and V 1 are the initial and steady-state voltages of the sample. After obtaining T * , different values of α eff are used to fit the experimental results T * based on Equation (2). According to the least squares fitting technique, the value giving the best fit of T * is used as the α eff of the sample.…”

Numerical and experimental analyses of wearable antennas, including novel fabrication and metrology techniques

“…In addition, several conductive woven fabrics can be sewed on the textile substrate as a radiating area of the antennas as well as other circuitries. Among the fast, high-resolution and cost-effective printing techniques, screen printing is promising due to simplicity, affordability, time-efficiency and reduced material wastage [36]. When compared with the expensive instruments required for the inkjet printing, laser prototyping or cleanroom condi-tions, screen printing is an appropriate choice with reasonable fabrication accuracy on a variety of substrates like plastics, fabrics, polymers, etc.…”

“…Several methods have been developed for sintering by using heat, laser, ultraviolet (UV) beam exposure, etc. For instance, one method involves exposure of laser beam on the printed surface by using formic acid in a nitrogen atmosphere [36,37]. Belt furnace with formic acid dosing system is used where laser sintering is carried out on the FASTLAPS roll-fed prototype system [36,37].…”