Ultra-low dielectric loss lithium-based, temperature stable microwave dielectric ceramics

Wang, Dong; Li, Lingxia; Du, M. C.

doi:10.1016/j.ceramint.2021.09.225

Cited by 9 publications

(4 citation statements)

References 51 publications

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“…Values of the dielectric properties were ε r = 18.1, Qxf = 105 661 GHz, and τ f = 1.3 ppm/ • C for x = 0.08. 51 Li 2 Mg 3 Ti 1-x (Zn 1/3 Nb 2/3 ) x O 6 , (0.02 ≤ x ≤ 0.08) Partial substitution of (Zn 1/3 Nb 2/3 ) 4+ in the Ti 4+ site in Li 2 Mg 3 TiO 6 was also studied aiming to improve the Qxf value. The main goal was to produce a dielectric ceramic suitable for microstrip antenna application.…”

Section: Mgnbomentioning

confidence: 99%

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Ceramic compositions for 5G devices containing niobium: A survey

Muccillo,

Muccillo

2024

Int J Ceramic Engine & Sci

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The main dielectric properties of several ceramic materials having niobium in their composition, proposed to take part in 5G telecommunication devices, are reviewed. A preliminary basic presentation of 5G systems, the requirements for implementing their use, a concise review of the ceramic compositions containing niobium that have been studied thus far, and an evaluation of their performance are detailed. A survey is presented, including more than 80 different compositions containing niobium, focusing on key parameters, such as dielectric constant, quality factor, temperature coefficient, and sintering temperature. These parameters play a role for assessing the potential application of these ceramics in 5G devices.

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Section: Mgnbomentioning

confidence: 99%

“…A suitable sintering temperature of 1220°C resulted in high relative densities (∼96%). Values of the dielectric properties were ε r = 18.1, Qxf = 105 661 GHz, and τ f = 1.3 ppm/°C for x = 0.08 51 …”

Section: Ceramic Compositions For 5g Devicesmentioning

confidence: 99%

Ceramic compositions for 5G devices containing niobium: A survey

Muccillo,

Muccillo

2024

Int J Ceramic Engine & Sci

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“…This is consistent with the XRD results which show the same phase compositions in both cases. The changes in the dielectric permittivity with the temperature are well-known to be determined by the composition and the crystal lattice structure [9,36,37]. The loss tangent values at room temperature are 0.01-0.011 in the frequency range of 0.5-1.6 THz (Fig.…”

Section: Influence Of Frequency Temperature and Sintering Conditions ...mentioning

confidence: 99%

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Szwagierczak¹,

Synkiewicz-Musialska²,

Kulawik³

et al. 2023

Journal of Advanced Ceramics

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With the development of low dielectric permittivity materials having an ultra-low sintering temperature, testing their dielectric properties at terahertz frequencies suitable for 6G communication systems and implementation of the fabricated materials in ultra-low temperature cofired ceramics (ULTCC) were the main goals of the research. Lithium tungstate Li 2 WO 4 was synthesized by a solid-state reaction and used for the preparation of green tapes and test structures with cofired internal conductive layers, which are destined for substrates of microwave and submillimeter wave circuits. Sintering behavior, thermal effects, and mass changes of the green tapes during heating were studied using a hot-stage microscope, differential thermal analysis, and thermogravimetry. A single-phase composition was revealed for being undoped and doped with AlF 3 -CaB 4 O 7 ceramics. The impact of frequency, temperature, the addition of AlF 3 -CaB 4 O 7 and CuBi 2 O 4 dopants, and sintering temperature was the subject of in-depth characterization of dielectric properties in a terahertz region. A glass-free composition, ultra-low sintering temperature of 590-630 ℃, low roughness of the green tapes, dense microstructure, compatibility with Ag conductors, low and stable dielectric permittivity of 5.0-5.8 in a broad range of 0.2-2 THz, and low dielectric loss of 0.008-0.01 at 1 THz are the main advantages of the developed ULTCC substrates.

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“…It is traditionally believed that the reasons for a frequency offset are the thermal deformation of materials and machining errors affecting device dimensions. Many studies have focused on synthesizing ceramic materials with low or even near-zero temperature coefficients [14][15][16][17]. Moreover, adequate studies have been conducted on the influence of errors in dimensions on waveguide components.…”

Section: Introductionmentioning

confidence: 99%

Microwave Frequency Offset Induced by Subsurface Damage in Abrasive-Machined Semiconductor Ceramic Waveguide

Wang,

Wei,

Lin

et al. 2023

Machines

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Ceramic waveguide components play a critical role in modern microwave semiconductor systems. For the first time, this work reports experimental results obtained when dielectric ceramics are abrasive-machined into waveguide components. This process will cause subsurface damage (SSD), resulting in a deviation in their working frequency which can degrade the performance of the system. For a substrate-integrated waveguide (SIW) resonator working at 10.1 GHz, SSD with a depth of 89 um can cause a maximum frequency offset of 20.2%. For a mm wave component working at 70 GHz, the corresponding frequency offset could increase to 169%. Three resonator SIW filters with SSD are studied, and the results demonstrate that the frequency offset induced by SSD can reduce the pass rate of the filters from 95.4% to 0%. A theoretical analysis is performed to reveal the mechanism and to offer a quantitative estimation of the limiting range of the offset caused by SSD. Feasible methods for reducing the offset caused by SSD, such as structure design, processing optimization, and material reinforcement, are discussed.

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Ultra-low dielectric loss lithium-based, temperature stable microwave dielectric ceramics

Cited by 9 publications

References 51 publications

Ceramic compositions for 5G devices containing niobium: A survey

Ceramic compositions for 5G devices containing niobium: A survey

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Microwave Frequency Offset Induced by Subsurface Damage in Abrasive-Machined Semiconductor Ceramic Waveguide

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Ultra-low dielectric loss lithium-based, temperature stable microwave dielectric ceramics

Cited by 9 publications

References 51 publications

Ceramic compositions for 5G devices containing niobium: A survey

Ceramic compositions for 5G devices containing niobium: A survey

Ultra-low temperature cofired ceramics based on Li2WO4as perspective substrate materials for terahertz frequencies

Microwave Frequency Offset Induced by Subsurface Damage in Abrasive-Machined Semiconductor Ceramic Waveguide

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Product

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Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies