A resonant-cavity method for measuring dielectric properties at ultrahigh frequencies

Works, C. N.; Dakin, T. W.; Boggs, F. W.

doi:10.1109/ee.1944.6440656

Cited by 11 publications

(8 citation statements)

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“…The device resonates at a specific frequency with a quality factor (Q-factor) over 2000. Because of the high Q factor, it is more sensitive to the dielectric samples than a conventional coil-and-capacitor resonant circuit [38]. The sample size requirement for the SPDR test is at least 5 cm × 5 cm, and the sample thickness should be less than 2 mm.…”

Section: Dielectric Constant Testmentioning

confidence: 99%

Direct-Write Spray Coating of a Full-Duplex Antenna for E-Textile Applications

Zhou

Soltani

et al. 2020

Micromachines

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Recent advancements in printing technologies have greatly improved the fabrication efficiency of flexible and wearable electronics. Electronic textiles (E-textiles) garner particular interest because of their innate and desirable properties (i.e., conformability, breathability, fabric hand), which make them the ideal platform for creating wireless body area networks (WBANs) for wearable healthcare applications. However, current WBANs are limited in use due to a lack of flexible antennas that can provide effective wireless communication and data transfer. In this work, we detail a novel fabrication process for flexible textile-based multifunctional antennas with enhanced dielectric properties. Our fabrication process relies on direct-write printing of a dielectric ink consisting of ultraviolet (UV)-curable acrylates and urethane as well as 4 wt.% 200 nm barium titanate (BT) nanoparticles to enhance the dielectric properties of the naturally porous textile architecture. By controlling the spray-coating process parameters of BT dielectric ink on knit fabrics, the dielectric constant is enhanced from 1.43 to 1.61, while preserving the flexibility and air permeability of the fabric. The novel combination textile substrate shows great flexibility, as only 2 N is required for a 30 mm deformation. The final textile antenna is multifunctional in the sense that it is capable of operating in a full-duplex mode while presenting a relatively high gain of 9.12 dB at 2.3 GHz and a bandwidth of 79 MHz (2.260–2.339 GHz) for each port. Our proposed manufacturing process shows the potential to simplify the assembly of traditionally complex E-textile systems.

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Section: Dielectric Constant Testmentioning

confidence: 99%

Direct-Write Spray Coating of a Full-Duplex Antenna for E-Textile Applications

Zhou

Soltani

et al. 2020

Micromachines

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“…Therefore, dielectric properties were measured using a doubly reentrant cavity at lower frequencies. This method (16)(17)(18)(19)(20) permits the evaluation of permittivity and dielectric loss over a wide range of frequencies (100 MHz to 1 GHz) using relatively small, cylindrically shaped specimens. Accurate dielectric loss data can be obtained for low-to medium-loss materials (tan &10\ to 10\).…”

Section: Red-black Single Crystals Of Bamentioning

confidence: 99%

“…The value of x corresponds to the equivalents of reduction that occur to maintain electroneutrality as the Ti-content increases. When prepared in air, this phase occurs at x ‫؍‬ 3 with the stoichiometry Ba 6 Fe 45 Ti 17 23 . Both compounds are partially reduced; the former contains 3 moles of Fe 2؉ (or Ti 3؉ ) per formula unit, and the latter contains 1 mole.…”

mentioning

confidence: 99%

Characterization of Ternary Compounds in the BaO:Fe2O3:TiO2System: Ba6Fe45Ti17O106and BaFe11Ti3O23

Vanderah

Wong‐Ng

Toby

et al. 1999

Journal of Solid State Chemistry

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“…Several methods for measuring the complex permittivity of materials have been developed over the years, including transmission line methods (Boughriet et al, 1997), coaxial probe methods (Canós Marín et al, 2013), resonant methods (Hirvonen et al, 1996; Works et al, 1944), and free space methods (Ghodgaonkar et al, 1989; Redheffer, 1947). Due to the possibility of measuring effective electromagnetic parameters of compound materials, free space methods are widely used as can be derived from 30 years literature analysis (B. R. Rao, 1989, D. K. Ghodgaonkar et al, 1990 to cite two of the oldest works and M. S. Hilario et al, 2019, A.…”

Section: Introductionmentioning

confidence: 99%

Improved Fabry‐Pérot Electromagnetic Material Characterization: Application and Results

et al. 2020

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While several mm-wave and sub-THz frequency bands are being proposed for next generation wireless systems to meet the increasing traffic demand, the electromagnetic properties of many common use materials at those frequencies still need to be determined. The evaluation of such properties is important for the design and deployment of future wireless networks. Recently, a simple method based on Fabry-Pérot resonance has been proposed to address the need of easy material characterization at mm-wave frequencies. In this study, the method has been improved and applied to the characterization of several materials at mm-wave and sub-THz frequencies, in order to assess its reliability, usability, and accuracy in practical cases. The method is shown to achieve a good accuracy level despite the very simple measurement setup and the great flexibility. However, some application limitations are highlighted and discussed in the paper. A method for electromagnetic material characterization based on an improved Fabry-Pérot technique is presented. Recently, a simple and fast method for the characterization of low-loss materials based on the Fabry-Pérot (FP) resonance that takes place inside a material slab has been proposed (Degli-Esposti et al., 2017).

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A resonant-cavity method for measuring dielectric properties at ultrahigh frequencies

Cited by 11 publications

References 0 publications

Direct-Write Spray Coating of a Full-Duplex Antenna for E-Textile Applications

Direct-Write Spray Coating of a Full-Duplex Antenna for E-Textile Applications

Characterization of Ternary Compounds in the BaO:Fe2O3:TiO2System: Ba6Fe45Ti17O106and BaFe11Ti3O23

Improved Fabry‐Pérot Electromagnetic Material Characterization: Application and Results

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