Microwave dielectric properties of Bi2(Li0.5Ta1.5)O7–TiO2-based ceramics for 5G cellular base station resonator application

Ullah, Atta; Liu, Hanxing; Manan, Abdul; Ahmad, Arbab Safeer; Zhai, Pengcheng; Hao, Hua; Cao, Minghe; Yao, Zhonghua; Ullah, Asmat; Jan, Abdullah; Emmanuel, Marwa; Iqbal, Javed

doi:10.1016/j.ceramint.2020.11.206

Cited by 18 publications

(10 citation statements)

References 36 publications

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“…The microwave dielectric properties (Q×f value vs. ε r ) of medium/high ε r ceramics reported after 2010 with high Q and near-zero τ f are summarized in Fig. 10 [ 25,26,29,33,36,37,54,[73][74][75][76][77][78]. The current BNT-AN ceramics obviously exhibit superior microwave dielectric properties.…”

Section: Almentioning

confidence: 99%

“…In recent years, BLT with a tungsten-bronze structure and CLT with a perovskite structure have been extensively studied [19][20][21][22][23][24]. Meanwhile, novel ceramic systems such as Bi 2 (Li 0.5 Ta 1.5 )O 7 [25,26] and BiVO 4 [27,28] have also been developed. However, the above-mentioned ceramic materials either have relatively low Q×f values or relatively large temperature coefficients of resonant frequency (τ f ), which cannot yet meet the application needs of 5G technology.…”

Section: Introduction mentioning

confidence: 99%

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Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Guo

Luo

et al. 2022

J Adv Ceram

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Low-loss tungsten—bronze microwave dielectric ceramics are dielectric materials with potential application value for miniaturized dielectric filters and antennas in the fifth-generation (5G) communication technology. In this work, a novel Al/Nd co-doping method of Ba4Nd9.33Ti18O54 (BNT) ceramics with a chemical formula of Ba4Nd9.33+z/3Ti18−zAlzO54 (BNT—AN, 0 ≼ z ≼ 2) was proposed to improve the dielectric properties through structural and defect modulation. Together with Al-doped ceramics (Ba4Nd9.33Ti18−zAl4z/3O54, BNT—A, 0 ≼ z ≼ 2) for comparison, the ceramics were prepared by a solid state method. It is found that Al/Nd co-doping method has a significant effect on improving the dielectric properties compared with Al doping. As the doping amount z increased, the relative dielectric constant (εr) and the temperature coefficient of resonant frequency (τf) of the ceramics decreased, and the Q×f values of the ceramics obviously increased when z ≼ 1.5. Excellent microwave dielectric properties of εr = 72.2, Q×f = 16,480 GHz, and τf = +14.3 ppm/°C were achieved in BNT—AN ceramics with z = 1.25. Raman spectroscopy and thermally stimulated depolarization current (TSDC) technique were firstly combined to analyze the structures and defects in microwave dielectric ceramics. It is shown that the improvement on Q×f values was originated from the decrease in the strength of the A-site cation vibration and the concentration of oxygen vacancies $$\text{V}_\text{O}^{^{ \cdot \cdot }}$$, demonstrating the effect and mechanism underlying for structural and defect modulation on the performance improvement of microwave dielectric ceramics.

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Section: Almentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Guo

Luo

et al. 2022

J Adv Ceram

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“…However, its limited bandwidth means that it rapidly becomes crowded, and signals are often dropped when connecting to multiple peripherals. 5.8 GHz transmission is more stable due to fewer consumer devices but requires antennas to work at higher frequencies and thus materials such as MAS with low εr are important for current micro-as well as future millimeter wave technology [17][18][19][20][21][22][23] . (1-x)Mg2Al4Si5O18-xTiO2 (x = 0-5.5 wt%) microwave ceramics (Abbr.…”

Section: Introductionmentioning

confidence: 99%

Low permittivity cordierite-based microwave dielectric ceramics for 5G/6G telecommunications

Lou

Mao

Song

et al. 2022

Journal of the European Ceramic Society

102

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“…In recent years, BLT with a tungsten-bronze structure and CLT with a perovskite structure have been extensively studied [18][19][20][21][22][23]. Meanwhile, novel ceramic systems such as Bi 2 (Li 0.5 Ta 1.5 )O 7 [24,25] and BiVO 4 [26,27] have also been developed. However, the above-mentioned ceramic materials either have a relatively low Q×f value or a relatively large temperature coe cient of resonant frequency (τ f ), which cannot yet meet the application needs of 5G technology.…”

Section: Introductionmentioning

confidence: 99%

Structure, Defects and Microwave Dielectric Properties of Al-doped and Al/Nd Co-doped Ba4Nd9.33Ti18O54 Ceramics

Guo¹,

Ma²,

Luo³

et al. 2021

Preprint

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Ba4Nd9.33Ti18-zAl4z/3O54 (BNT-A, 0 ≤ z ≤ 2) and Ba4Nd9.33+z/3Ti18-zAlzO54 (BNT-AN, 0 ≤ z ≤ 2) ceramics were prepared by solid state method, and the effects of the two doping methods on microwave dielectric properties were compared. As the doping amount z increased, the relative dielectric constant (εr) and the temperature coefficient of resonant frequency (τf) values of the ceramics decreased, and the quality factor (Q, usually expressed by Q×f, where f is the resonant frequency) of the ceramics obviously increased when z ≤ 1.5. With the same z value, the εr and Q×f values of Al/Nd co-doped ceramics are both higher than those of Al-doped ceramics. Rietveld refinement, Raman spectroscopy and thermally stimulated depolarization current (TSDC) technique were applied to clarify the relationship among the structure, defects and microwave dielectric properties. It is shown that the Q×f values of those ceramics were closely related to the strength of the A-site cation vibration and the concentration of oxygen vacancies (B). Excellent microwave dielectric properties of εr = 72.2, Q×f = 16480 GHz, and τf = +14.3 ppm/℃ were achieved in BNT-AN ceramics with z = 1.25.

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Microwave dielectric properties of Bi2(Li0.5Ta1.5)O7–TiO2-based ceramics for 5G cellular base station resonator application

Cited by 18 publications

References 36 publications

Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Low permittivity cordierite-based microwave dielectric ceramics for 5G/6G telecommunications

Structure, Defects and Microwave Dielectric Properties of Al-doped and Al/Nd Co-doped Ba4Nd9.33Ti18O54 Ceramics

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