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Combinatorial Synthesis and Screening of (Ba,Sr)(Ti,Mn)O3 Thin Films for Optimization of Tunable Co-Planar Waveguides

Abstract

The identification and optimization of tunable dielectric materials exhibiting low loss characteristics in the GHz frequencies are essential in the development of low power devices for microwave applications. We have applied a combinatorial synthetic methodology employing multiple atomic evaporative sources to produce compositional gradient thin films (Ba,Sr)(Ti,Mn)O3 perovskites. High throughput screening chips of both capacitive and waveguide structures are used to measure the compositional dependence of the dielectric properties of fully characterised thin film materials. The co-planar waveguides are shown to allow measurements at frequencies exceeding 10 GHz. Using the methodology, we have identified (Ba,Sr)(Ti,Mn)O3 compositions which exhibit good tunability with low losses at microwave frequencies: For a single device with a 10 V DC bias one can achieve a 12 degree phase shift with excellent transmission characteristics. At a small biasing voltage of 10 V, over 12 ̊ phase angle shifting can be obtained with an insertion loss of ~3.2 dB. We show that small changes in composition can result in significant change in dielectric characteristics and device performance, and that the experimental protocol developed provides a powerful methodology for the development of materials and microwave devices.

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Publication details

The article was received on 23 Mar 2018, accepted on 13 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8TC01396A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Combinatorial Synthesis and Screening of (Ba,Sr)(Ti,Mn)O3 Thin Films for Optimization of Tunable Co-Planar Waveguides

    I. T. Bakaimi, X. He, S. Guerin, N. Z. I. B. Hashim, Q. Luo, I. M. Reaney, S. Gao, K. de Groot and B. E. Hayden, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01396A

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