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Low loss flexible SrTiO3/POE dielectric composites for microwave application

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Abstract

Flexible, high dielectric constant and low dielectric loss composites for microwave application fabricated with SrTiO3 (STO) ceramic filler dispersed inside a thermoplastic polyolefin elastomer (POE) polymer matrix have been studied in this paper. The dielectric property and the mechanical property of STO/POE composites filled with different volume fraction of ceramic filler were investigated. The results indicated that with the increase volume fraction of ceramic filler, both the permittivity and the dielectric loss of composites increased. Good frequency stability within a wide range was observed in all the samples. For the composites containing 40 vol% STO, the composites has a tensile strength of 2.75 MPa with an elongation of about 90% at break value. The permittivity and the dielectric loss of the composites were 11.0 and 0.01 in microwave frequency, respectively. A microstrip transmission line on the composites containing 40 vol% STO as a microwave substrate is designed and measured after bending at different angles, meanwhile the transmission coefficients of the microstrip transmission line were unchanged when bending angle is less than 60°. This indicates that the STO/POE composites have the promising characteristics for potential applications in microwave substrate, flexible dielectric waveguide and related flexible microwave devices.

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Acknowledgement

This work was supported by the National 973-project of China (grant 2002CB613302), the Ph.D. Program Fund from the Ministry of Education of China (grant 20060698007) and NSFC project of China (grant 50572085).

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Authors and Affiliations

  1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an, 710049, China

    Feng Xiang, Hong Wang, Haibo Yang, ZiYuan Shen & Xi Yao

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  1. Feng Xiang
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  2. Hong Wang
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  3. Haibo Yang
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  4. ZiYuan Shen
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  5. Xi Yao
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Correspondence to Hong Wang.

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Xiang, F., Wang, H., Yang, H. et al. Low loss flexible SrTiO3/POE dielectric composites for microwave application. J Electroceram 24, 20–24 (2010). https://doi.org/10.1007/s10832-008-9453-y

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  • DOI: https://doi.org/10.1007/s10832-008-9453-y

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