scholarly journals Paving the Way to Eco-Friendly IoT Antennas: Tencel-Based Ultra-Thin Compact Monopole and Its Applications to ZigBee

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3658
Author(s):  
María Elena de Cos Gómez ◽  
Humberto Fernández Álvarez ◽  
Alicia Flórez Berdasco ◽  
Fernando Las-Heras Andrés
Keyword(s):  
Dielectric Permittivity ◽  
Frequency Band ◽  
Loss Tangent ◽  
Relative Dielectric Permittivity ◽  
Iot Applications ◽  
Half Wave ◽  
And Performance ◽  
Dielectric Permittivity And Loss ◽  
Range Test ◽  
The Way

An ultrathin, compact ecofriendly antenna suitable for IoT applications around 2.45 GHz is achieved as a result of exploring the use of Tencel fabric for the antenna’s design. The botanical ecofriendly Tencel is electromagnetically characterized, in terms of relative dielectric permittivity and loss tangent, in the target IoT frequency band. To explore the suitability of the Tencel, a comparison is conducted with conventionally used RO3003, with similar relative dielectric permittivity, regarding the antenna dimensions and performance. In addition, the antenna robustness under bent conditions is also analyzed by measurement. To assess the relevance of this contribution, the ultrathin ecofriendly Tencel-based antenna is compared with recently published antennas for IoT in the same band and also, with commercial half-wave dipole by performing a range test on a ZigBee-based IoT testbed.

High Frequency Dielectric Response of Calcium Aluminate Cements: Potential Packaging Substrate Materials

1987 ◽  
Vol 108 ◽  
Author(s):  
Paul Sliva ◽  
M. Leffler ◽  
M. Bliss ◽  
L. E. Cross ◽  
B. E. Scheetz
Keyword(s):  
Dielectric Permittivity ◽  
Calcium Aluminate ◽  
Dielectric Response ◽  
Room Temperature ◽  
Perturbation Methods ◽  
Microwave Frequency ◽  
Far Infrared ◽  
Poly Vinyl Alcohol ◽  
Relative Dielectric Permittivity ◽  
Dielectric Permittivity And Loss

ABSTRACTDielectric permittivity and loss tangent were measured on: 1) pressed disks of four different calcium aluminate cements shear mixed with water and poly(vinyl alcohol) and cured at room temperature and 2) laminates of SECAR 71 cement sintered at 1450°C. Post resonance and perturbation methods were used for microwave frequency measurements. Far infrared dielectric response of the cements was determined by FTIR in the diffuse reflectance mode. The real and imaginary parts of the relative dielectric permittivity were obtained via a conventional Kramers-Kronig analysis.

Microwave Characterization Of Electro-Optic Polymers

2002 ◽  
Vol 734 ◽  
Author(s):  
Guru Subramanyam ◽  
Prasanna Mathala ◽  
Christine Chevalier ◽  
Antonio Davis ◽  
Perry Yaney ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Loss Tangent ◽  
Polymer Films ◽  
Accurate Determination ◽  
Relative Dielectric Constant ◽  
Mapping Technique ◽  
Relative Dielectric Permittivity ◽  
Scattering Parameter ◽  
Microwave Frequencies ◽  
Electro Optic

ABSTRACTElectro-optic polymer thin-films were characterized at microwave frequencies, for possible applications in GHz modulators. Single layers of the polymers were spin coated on low loss magnesium oxide substrates for characterizing the polymers at microwave frequencies. Coplanar waveguide test structures were designed for evaluation of the relative dielectric permittivity as well as the loss-tangent of the polymers at microwave frequencies. A conformal mapping technique was used for the extraction of relative dielectric constant of the polymer films based on the microwave scattering parameter measurements. As an example, a DR1-PMMA polymer had a relative dielectric permittivity of 3.01 and a loss-tangent of 0.075 at 8 GHz. The design of the test structures, the procedure for the accurate determination of the dielectric permittivity and the loss-tangent of the polymer films are discussed in this paper.

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