Low permittivity cordierite-based microwave dielectric ceramics for 5G/6G telecommunications
Wei-Gang Lou,Minmin Mao,Kai Xing Song,Kuiwen Xu,Bing Li,Wen-jun Li,Bin Yang,Zeming Qi,Jian-jian Zhao,Shikuan Sun,Huixin Lin,Yuan-Feng Hu,Di Zhou,Dawei Wang,Ian M. Reaney +14 more
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TLDR
In this article , 5.5 wt% TiO2 (MAS-T5.5) was used to adjust τf of MAS to −2.8 ppm/℃ whilst retaining low εr (5.24) and good Q×f (33,400 GHz), properties consistent with those obtained by infrared reflectance.Abstract:
5G and forthcoming 6G communication systems require dielectric ceramics with low relative permittivity (εr) and near-zero temperature coefficient of resonant frequency (τf) for the lower part of the microwave (MW) band and at sub-Terahertz. Mg2Al4Si5O18 (MAS) ceramics are promising candidates due to their low εr (~ 6) and high-quality factor (Q×f > 40,000 GHz) but have a large τf. In this study, 5.5 wt% TiO2 (MAS-T5.5) was used to adjust τf of MAS to −2.8 ppm/℃ whilst retaining low εr (5.24) and good Q×f (33,400 GHz), properties consistent with those obtained by infrared reflectance. A demonstrator microstrip patch antenna with gain 4.92 dBi and 76.3% efficiency was fabricated from MAS-T5.5. read more
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High Q×f values of Zn-Ni co-modified LiMg0.9Zn0.1-Ni PO4 microwave dielectric ceramics for 5G/6G LTCC modules
Shuaibing Li,Chen Li,Minmin Mao,Kai Xing Song,Yaseen Iqbal,Amir Khesro,Sinan S. Faouri,Zhilun Lu,Bing Li,Shikuan Sun,Dawei Wang +10 more
TL;DR: In this paper , Zn-Ni co-modified LiMg 0.9 Zn 0.1-Ni 0.04 PO 4 sintered at 875 ℃ for 2 h.
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High-Qf value and temperature stable Zn2+-Mn4+ cooperated modified cordierite-based microwave and millimeter-wave dielectric ceramics
Zhiyu Xiu,Minmin Mao,Zhilun Lu,Zhichao Huang,Zeming Qi,Hadi Barzegar Bafrooei,Tao Zhou,Dawei Wang,Huixing Lin,Ehsan Taheri-Nassaj,Kai Xing Song +10 more
TL;DR: In this paper , the phase structure, microstructure and microwave dielectric properties of Mg2Al4-2x(Mn 0.5Zn0.5)0.3Si5O18-ywt%TiO2 composite ceramic are studied by crystal structure refinement, scanning electron microscope (SEM), the theory of complex chemical bonds and infrared reflectance spectrum.
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Effects of Ionic Coordination Bonding on Microwave Dielectric Properties of Y2CaBGa4O12 (B = Zr, Sn) Garnets
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Acrylamide-modified polyvinyl alcohol and combined with graphene oxide for low dielectric constant composite films
TL;DR: In this paper , the authors proposed a structure optimization approach by designing a Michael addition reaction between PVA and acrylamide (AM) to decrease its polar segments and to develop high transparency and low dielectric loss graphene oxide (GO)/PVA-AM composite film.
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Crystal structure, chemical bond characteristics, and microwave dielectric properties of novel Sr2CaMoO6 ceramic at different sintering temperatures
Bao Jian,Chen Yueguang,Zhou Yuanyuan,Guo Wei-jia,Zhang Yuping,Du Jialun,Wu Haitao,Yu Zhenxing +7 more
TL;DR: In this paper , the crystal structure, chemical bond characteristics, and microwave dielectric properties of SCM ceramic were investigated for the first time using the conventional solid-state process.
References
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Microwave Dielectric Ceramics for Resonators and Filters in Mobile Phone Networks
Ian M. Reaney,D. Iddles +1 more
TL;DR: In this paper, a clear picture has emerged of the principal factors, that influence microwave properties, and gives examples of where they have been used to control microwave properties and ultimately develop new materials.
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Combined differential and common-mode scattering parameters: theory and simulation
Abstract: A theory for combined differential and common-mode normalized power waves is developed in terms of even and odd mode impedances and propagation constants for a microwave coupled line system. These are related to even and odd-mode terminal currents and voltages. Generalized s-parameters of a two-port are developed for waves propagating in several coupled modes. The two-port s-parameters form a 4-by-4 matrix containing differential-mode, common-mode, and cross-mode s-parameters. A special case of the theory allows the use of uncoupled transmission lines to measure the coupled-mode waves. Simulations verify the concept of these mixed-mode s-parameters, and demonstrate conversion from mode to mode for asymmetric microwave structures. >
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Characterization of liquid crystal polymer (LCP) material and transmission lines on LCP substrates from 30 to 110 GHz
TL;DR: In this article, the dielectric properties of liquid crystal polymer (LCP) have been investigated for millimeter-wave frequency bands at different LCP substrate thicknesses, and various transmission lines are fabricated on different thicknesses and the loss characteristics are given in decibels per centimeter.
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High permittivity and low loss microwave dielectrics suitable for 5G resonators and low temperature co-fired ceramic architecture
TL;DR: In this article, a single Bi2(Li0.5Ta1.5)O7 + xBi2O3 (x = 0, 0.01 and 0.02) ceramics were prepared using a solid state reaction method.
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Novel temperature stable high-εr microwave dielectrics in the Bi2O3–TiO2–V2O5 system
TL;DR: In this paper, a series of low temperature firing (1 − x)BiVO4-xTiO2 (x = 0.4, 0.50,0.55 and 0.60) microwave dielectric ceramics was prepared using traditional solid state reaction method.