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Conference Poster Year : 2019

Ring resonator characterization at microwave frequencies of a novel soft dielectric


Recent evolution in wireless communication and flexible electronics [1], where planar antennas are subject to external mechanical constraints such as bending requires to customize the main components such as the dielectric to make it more suitable for the upcoming trends. Developing soft dielectric brings many advantages as it significantly reduces the weight and permits to design engineered alternatives to the existing rigid antennas. For instance, it is of a great importance to develop soft dielectric substrate with low dielectric loss in order not to hinder the radiation of antenna. In this work, we present a novel soft dielectric thermoplastic elastomer based on standard polyolefins like polypropylene and polyethylene and to our knowledge, no characterization method was reported to similar blends in microwave frequencies. We propose an established methodology of dielectric characterization up to 40 GHz based on the ring resonator with grounded coplanar waveguide [2] by the GSG (Ground Signal Ground) probe that was tailored for a 200-µm thick soft dielectric thermoplastic elastomer. The rings were prepared via photolithography of the copper layer deposited by sputtering over a thermo-molded thermoplastic dielectric film. The proposed methodology first consists in extracting the dielectric permittivity and dielectric loss up to 10 kHz based on the metal insulator metal model, where measurements were carried out using impedance meter Agilent 4294A. Then the ring geometric dimensions were optimized by High frequency electromagnetic simulations. Different ring radiuses were tested to minimize the error in calculation of the dielectric properties and the results were obtained by using an Agilent E8364B Vector Network Analyzer (VNA) (bandwidth from 10 MHz to 50 GHz) and Cascade ACP40-AW-GSG probes (40 GHz bandwidth, 500 µm pitch). The whole test system was controlled using Wincal Cascade software. The measured dielectric constant and loss tangent up to 40 GHz were extracted from the resonant peaks of the S12 and were found to be r ~ 2.42 and tan ~ 0.008 at ~15 GHz respectively for a polyethylene octene copolymer (OBC) and styrene-ethylene-butadiene-styrene (SEBS) based blend (Young’s Modulus : ~5 MPa). The low dielectric loss in the X-band makes the soft dielectric blend promising for microwave devices such as antenna applications.
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Dates and versions

hal-02172039 , version 1 (03-07-2019)


  • HAL Id : hal-02172039 , version 1


Tessnim Sghaier, Mohammed El Gibari, Benoit Guiffard. Ring resonator characterization at microwave frequencies of a novel soft dielectric. PhotonIcs & Electromagnetics Research Symposium (PIERS), Jun 2019, Rome, Italy. , 2019, PIERS 2019. ⟨hal-02172039⟩
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