Preparation, characterization and dielectric properties of Ca2ZrSi4O12 ceramic and filled silicone rubber composites for microwave circuit applications

Shakhil, P.G.; Antoney, Albin; Narayanan, Priyanka; Sanaj, T.; Jose, Lijin; Arun, N.; Ratheesh, R.

doi:10.1016/j.mseb.2017.08.014

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…The most popular way to tune dielectric constant and dielectric loss is to mix with ceramics, e.g. Al2O3 [19], SiO2 [20], SrTiO3 [21], TiO2 [22], [23], BaTiO3 [24], BaZnTaO3 [25], and many others [26], [27], [28], [29], [30]. This method reduces the dielectric loss to a certain extent, but the increase in the Dk is inevitable, which might be beneficial for miniaturization but might be less desirable for the antenna's performance.…”

Section: Materials and Characterizationmentioning

confidence: 99%

Fully Flexible, Polymer based Microwave Devices Part I: Materials, Fabrication Technique, and Application to Transmission Lines

Cherukhin¹

2021

Preprint

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To achieve fully flexible microwave devices, we investigated flexible polymers in terms of chemical, mechanical, and electrical properties. Moreover, the fabrication techniques for polymer-based microwave devices have been developed to address chemical adhesion and demolding issues. Finally, based on formulated criteria, we have developed recipes for low-loss (0.001), low-Dk (1.73) flexible dielectric materials and applied them to the microstrip and CPW transmission lines. The microstrip and CPW lines' transmission loss is as low as 0.065 and 0.034 dB/cm at 2.5 GHz, respectively. The effects of various materials on microwave performance have been analyzed, from which we show acceptable limits for fully flexible microwave devices in S and L bands. The proposed molding process allows us to step out from 2D PCB designs and build 3D structures or hybrid PCB-3D components with a certain freedom in material properties. Additionally, the new material exhibits unique mechanical properties, which extends the material application to other fields. This work demonstrates that polymer-based flexible microwave electronics can have a competitive performance compared to rigid PCB technology. Additionally, it has been found that the polymer-based devices have significant performance improvements at elevated temperatures, which can be exploited in a high-temperature application.

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Section: Materials and Characterizationmentioning

confidence: 99%

Fully Flexible, Polymer based Microwave Devices Part I: Materials, Fabrication Technique, and Application to Transmission Lines

Cherukhin¹

2021

Preprint

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“…In general, the high content of SiO 4 tetrahedra corresponds to low ε r for microwave dielectric ceramics. Silicates with low permittivity include M O–SiO 2 ( M = Ba, Ca, Zn, Mg), 15–20 M O– N O–SiO 2 ( M = Ba, Sr, Ca; N = Zn, Mg, Co, Cu), 21–30 M O– N 2 O 3 –SiO 2 ( M = Ba, Ca; N = Al, Y, RE ), 5,31–37 and CaO– M O 2 –SiO 2 ( M = Sn, Zr, Hf) 38–46 . The low cost, absence of variable valence elements, and environmental friendliness of microwave dielectric ceramics should be considered for applications.…”

Section: Introductionmentioning

confidence: 99%

“…Silicates with low permittivity include MO-SiO 2 (M = Ba, Ca, Zn, Mg), [15][16][17][18][19][20] MO-NO-SiO 2 (M = Ba, Sr, Ca; N = Zn, Mg, Co, Cu), [21][22][23][24][25][26][27][28][29][30] MO-N 2 O 3 -SiO 2 (M = Ba, Ca; N = Al, Y, RE), 5,[31][32][33][34][35][36][37] and CaO-MO 2 -SiO 2 (M = Sn, Zr, Hf). [38][39][40][41][42][43][44][45][46] The low cost, absence of variable valence elements, and environmental friendliness of microwave dielectric ceramics should be considered for applications. Therefore, lowpermittivity silicates with variable valence elements and expensive raw materials are unsuitable for commercial production.…”

Section: Introductionmentioning

confidence: 99%

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa₂M₃O₉ (M = Si, Ge) ceramics

Yin

Zou³

et al. 2023

J Am Ceram Soc.

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Novel BaCa 2 M 3 O 9 (M = Si, Ge) microwave dielectric ceramics were prepared via solid-state reaction with sintering at 1125 • C-1275 • C for 5 h. Single-phase BaCa 2 M 3 O 9 (M = Si, Ge) ceramics were obtained according to stoichiometry. The single-phase BaCa 2 Ge 3 O 9 ceramic was confirmed through Rietveld refinement and high-resolution transmission electron microscopy/selected area electron diffraction and synthesized for the first time. The BaCa 2 M 3 O 9 (M = Si, Ge) exhibited a triclinic structure with a P 1 space group and good microwave dielectric properties. The ε r , Q × f, and τ f values of BaCa 2 M 3 O 9 (M = Si, Ge) ceramics are mostly dominated by the relative density, ionic polarizability, relative covalence, and bond energy of M-O bond, respectively. A high Q × f value (61 800 GHz at 16.3 GHz) was obtained in BaCa 2 Ge 3 O 9 ceramic due to its high r c (Ge-O) and low intrinsic dielectric loss. The BaCa 2 Si 3 O 9 ceramic exhibited small |τ f | value (-36.4 ppm/ • C) due to its large E Si-O . Excellent microwave dielectric properties (ε r = 8.31, Q × f = 61 800 GHz, and τ f = -58.7 ppm/ • C) were obtained for the BaCa 2 Ge 3 O 9 ceramic.

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“…Silicone rubber (SR) is widely used in dielectric applications due to its excellent chemical resistance, electrical insulation, and good flexibility. In order to improve the dielectric properties or absorbing properties of SR, nanofillers such as carbon nanotubes, graphene, clay, and ceramics are added to SR to prepare dielectric materials that meet the needs of rubber products [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Carbon nanotubes have good electrical and microwave absorbing properties, so they have attracted the attention of materials science and technology workers.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Dielectric Properties of Rubber Materials

et al. 2021

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According to specific formulas, the mixing of rubber samples occurs by two methods: open mixing and internal mixing. The effects of frequency, mixing process, carbon black (CB) content, zinc oxide (ZnO) content, and stearic acid (SA) content on the dielectric properties of rubber materials were studied. The results showed that the effects of the mixing process on the dielectric properties of the rubber samples cannot be ignored, and the appropriate mixing process should be selected when preparing the required rubber materials. The dielectric constant and loss factor of the rubber samples vary depending on the frequency. The dielectric constant had a peak and valley value, while the loss factor only had a peak. The dielectric constant and loss factor of rubber samples were significantly affected by the content of CB, ZnO, and SA. The peak frequency decreased with the increase in CB content, however, the dielectric constant increased with an increase in CB content. The higher the ZnO content, the lower the peak frequency. In addition, the dielectric constant and loss factor increased with an increase in ZnO content. The higher the SA content, the greater the peak frequency. In addition, the dielectric constant and loss factor decreased with an increase in SA content. It is hoped that the experimental results obtained can provide guidance for the study of the dielectric properties, microwave absorption properties, and microwave heating characteristics of rubber polymers.

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Preparation, characterization and dielectric properties of Ca2ZrSi4O12 ceramic and filled silicone rubber composites for microwave circuit applications

Cited by 7 publications

References 29 publications

Fully Flexible, Polymer based Microwave Devices Part I: Materials, Fabrication Technique, and Application to Transmission Lines

Fully Flexible, Polymer based Microwave Devices Part I: Materials, Fabrication Technique, and Application to Transmission Lines

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa₂M₃O₉ (M = Si, Ge) ceramics

An Experimental Study on the Dielectric Properties of Rubber Materials

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Preparation, characterization and dielectric properties of Ca2ZrSi4O12 ceramic and filled silicone rubber composites for microwave circuit applications

Cited by 7 publications

References 29 publications

Fully Flexible, Polymer based Microwave Devices Part I: Materials, Fabrication Technique, and Application to Transmission Lines

Fully Flexible, Polymer based Microwave Devices Part I: Materials, Fabrication Technique, and Application to Transmission Lines

Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa2M3O9 (M = Si, Ge) ceramics

An Experimental Study on the Dielectric Properties of Rubber Materials

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Correlation between structural characteristics and microwave dielectric properties of walstromite BaCa₂M₃O₉ (M = Si, Ge) ceramics