Effect of MnCO3 doping on the dielectric and tunable properties of BSTO/MgO composite for phased array antennas

Yang, Cheng‐Fu; Zhou, Hongqing; Liu, Min; Qiu, Tai

doi:10.1007/s10854-006-9094-3

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…As a result, the phase transition of BSCT occurs over a wide temperature range [15][16] and the dielectric-temperature stability is also improved. As was reported [17][18], the addition of metals ions, e.g., Mn 2+ , Fe 2+ , Cr 2+ , and Cu 2+ , improves the dielectric properties of BST. Mn 2+ are believed to substitute Ti 4+ and act as acceptors, which can reduce the dielectric loss effectively.…”

Section: Introductionsupporting

confidence: 67%

Effect of Mn2+ Additive on the Sinterability and Dielectric Properties of Ba0.55Sr0.4Ca0.05TiO3-MgO Composite Ceramics

Wang

Jia

2014

KEM

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Ba0.55Sr0.4Ca0.05TiO3-MgO (BSCTM) with Mn2+additive composite ceramics were prepared by the conventional solid state method with BaCO3, SrCO3, CaCO3, MgO and MnCO3as raw materials and B2O3and Li2CO3as sintering agent. The influence of the MnCO3additive on the sinterability and dielectric properties of BSCTM composite ceramics are investigated. The morphologies were analysized by scanning electron microscopy (SEM). The dielectric constant and dielectric loss of ceramics were measured by LCR meter at 1 kHz and 1 MHz. The temperature dependences of dielectric constant were measured by high-low temperature incubator tank and LCR meter at 1 MHz and a temperature range from-55 to 125 °C. The dielectric tunabilities were tested by C-T-V converter and LCR meter at 1 MHz and room temperature (25 °C). SEM results showed that BSCTM ceramics became more compact with the increase of Mn2+content, because Mn2+helped to form more oxygen vacancies for accelerating densification process. The addition of Mn2+largely reduced the dielectric loss while had little effect on dielectric constant. The dielectric constant and dielectric loss of 0.5mol% Mn2+doped BSCTM ceramics were 222 and 0.001, respectively. The dielectric tunability increased at first and then decreased with the increase of Mn2+content. The tunability of 0.5mol% Mn2+doped BSCTM ceramics were 4.04% under a DC electric field of 8.2 kV/cm.

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Section: Introductionsupporting

confidence: 67%

Effect of Mn2+ Additive on the Sinterability and Dielectric Properties of Ba0.55Sr0.4Ca0.05TiO3-MgO Composite Ceramics

Wang

Jia

2014

KEM

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“…Therefore, the Mn 4? ions maybe occupy the B-site of the perovskite lattice [27][28][29], and the CuO maybe exist in the grain boundary of BST. In addition, the Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

Qiu

et al. 2015

J Mater Sci: Mater Electron

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0.55Ba x Sr 1-x TiO 3 -0.45MgO composite ceramics (BST-MgO, x = 0.5-0.65) co-modified with CuO and MnO 2 were prepared by conventional soild state reaction method. The microstructure, phase and morphology were investigated. The results showed the formation of the perovskite BST phase and MgO phase. The dielectric constant (e r ) and tunability (T) of the ceramic samples increased with increasing Ba content. The dielectric loss (tan d) and figure of merit achieved their minimum and maximum at x = 0.6, respectively. The obtained ceramic sample with x = 0.6 exhibited favorable properties, which are listed as follows: e r = 190, tan d = 0.22 %, T = 16 %, E c = 5.6 kV/cm and FOM = 72.7.

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“…The antenna is commonly formed by solid metal now changed to the integration of graphene to exhibit tunable ability. Compared to the previous work, the antenna that shows tunable properties has used ceramics, [4] ferrite, [5] varactor diode, [6] electronic controllable, [7] and liquid crystal [8] . Graphene is a two‐dimensional material from a one‐atom‐thick layer of carbon atom [9] .…”

Section: Introductionmentioning

confidence: 99%

Tunable Properties of Graphene Antenna Affected by Curing Temperature and Exposure Time for Future Application

et al. 2023

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This paper proposes a tunable antenna based on graphene for future wireless communication technology. The proposed antenna that is made by graphene/polyimide film able to tune the frequency using thermal that is exposed on it. The approach is investigated since it able to work as the other reconfiguration technique but cannot be adjustable likes diodes and liquid crystal. The antenna is fabricated into fifteen similar pieces and are separately cured at different temperature and exposure time; 250 °C, 300 °C, and 350 °C, for 20 minutes, 30 minutes, 1 hour, 2 hours, and 3 hours. The fabricated antennas are measured its S‐parameter as well as the characterisation of relative complex permittivity, sheet resistance, conductivity, surface morphology, and structure analysis. The measured results indicate that the frequency is tuned to lower within 4.1 GHz at 250 °C, 5.5 GHz at 300 °C, and 400 MHz at 350 °C. Looking into the future, even though this work is not using the same antenna, but it will lead to the proof of concept for tunable graphene antenna using thermal at fifth generation (5G) and next generation.

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Effect of MnCO3 doping on the dielectric and tunable properties of BSTO/MgO composite for phased array antennas

Cited by 9 publications

References 14 publications

Effect of Mn<sup>2+</sup> Additive on the Sinterability and Dielectric Properties of Ba<sub>0.55</sub>Sr<sub>0.4</sub>Ca<sub>0.05</sub>TiO<sub>3</sub>-MgO Composite Ceramics

Effect of Mn<sup>2+</sup> Additive on the Sinterability and Dielectric Properties of Ba<sub>0.55</sub>Sr<sub>0.4</sub>Ca<sub>0.05</sub>TiO<sub>3</sub>-MgO Composite Ceramics

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

Tunable Properties of Graphene Antenna Affected by Curing Temperature and Exposure Time for Future Application

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