High performance distributed CPW phase shifters with etched BST thin films on Ф 3″ LaAlO3 substrates

Chen, Hongwei; Yang, Chao; Zhang, Jihua; He, Wei; Yu, Li; Zhang, Qiaozhen; Zheng, Shanxue; Lei, Guanhuan

doi:10.1016/j.solidstatesciences.2011.11.005

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…We developed CPW on this BST/sapphire film surface for measurement, which shows constant tunability of 15% at microwave frequencies from 1 to 8 GHz. Both BST/Pt/Ti/SiO 2 /Si and BST/sapphire can work as tunable elements in RF ends for achieving phase shifting or beam steering to improve wireless communication systems [16,17], depending on the requirement of different applications. To simplify the electrode patterning process, an approach of using a magnetic mask was developed to deposit the required pattern on the surface of the BST thin films, which opens possibility for low-cost and high-throughput material characterization at high microwave frequencies.…”

Section: Introduction mentioning

confidence: 99%

Microwave characterization of two Ba _0.6Sr _0.4TiO ₃ dielectric thin films with out-of-plane and in-plane electrode structures

Ruan¹,

Saunders²,

Giddens³

et al. 2023

Journal of Advanced Ceramics

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Ferroelectric (FE) thin films have recently attracted renewed interest in research due to their great potential for designing novel tunable electromagnetic devices such as large intelligent surfaces (LISs). However, the mechanism of how a polar structure in the FE thin films contributes to desired tunable performance, especially within the microwave frequency range, which is the most widely used frequency range of electromagnetics, has not been illustrated clearly. In this paper, we described several straightforward and cost-effective methods to fabricate and characterize Ba 0.6 Sr 0.4 TiO 3 (BST) thin films at microwave frequencies. The prepared BST thin films here exhibit homogenous structures and great tunability ( ) in a wide frequency and temperature range when the applied field is in the out-of-plane direction. The high tunability can be attributed to high concentration of polar nanoclusters. Their response to the applied direct current (DC) field was directly visualized using a novel non-destructive near-field scanning microwave microscopy (NSMM) technique. Our results have provided some intriguing insights into the application of the FE thin films for future programmable high-frequency devices and systems.

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Section: Introduction mentioning

confidence: 99%

Microwave characterization of two Ba _0.6Sr _0.4TiO ₃ dielectric thin films with out-of-plane and in-plane electrode structures

Ruan¹,

Saunders²,

Giddens³

et al. 2023

Journal of Advanced Ceramics

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“…Recently, due to its important characteristics, LaAlO 3 perovskite has gained importance due to its possible application as a catalytic, electronic, optic, and luminescent material [11]. For example, LaAlO 3 has been used as a catalyst solid for the hydrogenation and hydrogenolysis of hydrocarbons [12,13], as a nano-adsorbent [14], for the oxidative degradation of organic pollutants [15], and as a substrate for different thin films [16,17], amongst other applications.…”

Section: Introductionmentioning

confidence: 99%

Progress and Recent Strategies in the Synthesis and Catalytic Applications of Perovskites Based on Lanthanum and Aluminum

2022

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Lanthanum aluminate-based perovskite (LaAlO3) has excellent stability at high temperatures, low toxicity, and high chemical resistance and also offers wide versatility to the substitution of La3+ and Al3+, thus, allowing it to be applied as a catalyst, nano-adsorbent, sensor, and microwave dielectric resonator, amongst other equally important uses. As such, LaAlO3 perovskites have gained importance in recent years. This review considers the extensive literature of the past 10 years on the synthesis and catalytic applications of perovskites based on lanthanum and aluminum (LaAlO3). The aim is, first, to provide an overview of the structure, properties, and classification of perovskites. Secondly, the most recent advances in synthetic methods, such as solid-state methods, solution-mediated methods (co-precipitation, sol–gel, and Pechini synthesis), thermal treatments (combustion, microwave, and freeze drying), and hydrothermal and solvothermal methods, are also discussed. The most recent energetic catalytic applications (the dry and steam reforming of methane; steam reforming of toluene, glycerol, and ethanol; and oxidative coupling of methane, amongst others) using these functional materials are also addressed. Finally, the synthetic challenges, advantages, and limitations associated with the preparation methods and catalytic applications are discussed.

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“…Barium strontium titanate (BST) is a promising ferroelectric material for RFC antenna due to its excellent microwave characteristics, [3] such as electric-field tunable permittivity and relatively low dielectric loss. [4] BST also shows great prospective in some tunable microwave components, such as phase shifter, [5] tunable filter, [6] varactor, [7] delay line, [8] etc. Comparing with bulk BST, the BST film possesses a superior tunability and lower relative permittivity (ε r = 300-800), [6,9] however, the preparation methods, such as pulsed laser deposition, magnetron sputtering and metalorganic chemical vapor deposition, are too expensive to be used in the microwave industry.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh frequency tunability of aperture-coupled microstrip antenna via electric-field tunable BST

Du¹,

Xue²,

Gao³

et al. 2015

Chinese Phys. B

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High performance distributed CPW phase shifters with etched BST thin films on Ф 3″ LaAlO3 substrates

Cited by 8 publications

References 23 publications

Microwave characterization of two Ba _0.6Sr _0.4TiO ₃ dielectric thin films with out-of-plane and in-plane electrode structures

Microwave characterization of two Ba _0.6Sr _0.4TiO ₃ dielectric thin films with out-of-plane and in-plane electrode structures

Progress and Recent Strategies in the Synthesis and Catalytic Applications of Perovskites Based on Lanthanum and Aluminum

Ultrahigh frequency tunability of aperture-coupled microstrip antenna via electric-field tunable BST

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High performance distributed CPW phase shifters with etched BST thin films on Ф 3″ LaAlO3 substrates

Cited by 8 publications

References 23 publications

Microwave characterization of two Ba 0.6Sr 0.4TiO 3 dielectric thin films with out-of-plane and in-plane electrode structures

Microwave characterization of two Ba 0.6Sr 0.4TiO 3 dielectric thin films with out-of-plane and in-plane electrode structures

Progress and Recent Strategies in the Synthesis and Catalytic Applications of Perovskites Based on Lanthanum and Aluminum

Ultrahigh frequency tunability of aperture-coupled microstrip antenna via electric-field tunable BST

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Product

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Microwave characterization of two Ba _0.6Sr _0.4TiO ₃ dielectric thin films with out-of-plane and in-plane electrode structures

Microwave characterization of two Ba _0.6Sr _0.4TiO ₃ dielectric thin films with out-of-plane and in-plane electrode structures