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Flexible bandpass filter on polyimide substrate

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Abstract

A polyimide (PI)-based flexible bandpass filter is fabricated by self-metallization technology, which covers Wireless Local Area Network (WLAN) of 5.15—5.875 GHz. The measured characteristics indicate the flexible filter under flat state has the return loss of better than 20 dB, the minimum insertion loss of 0.83 dB, a 3 dB bandwidth of 0.725 GHz, and the central frequency of 5.5 GHz. At the same time, the designed filter is measured in different bending and folding conditions. Simulated and measured results are similar whether the filter is under flatting, bending, or folding conditions. Fatigue test and timeliness test are studied to confirm that the filter has stable chemical and mechanical properties. The formed silver layers fabricated by self-metallization technology have good mechanical and electrical flexibility. The designed flexible filter is promised for integration within future flexible electronics.

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Acknowledgement

This research was funded by the Nantong Science and technology project (JC2019112), supported by Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University (2020MIP003) and supported by the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. School of Information Science and Technology, Nantong University, Nantong, 226019, China

    Jun-Shuai Gong, Zhi-Liang Wang, Hui-Wen Qu & Ding-Yong Cang

  2. Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, 200241, China

    Zhi-Liang Wang

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  1. Jun-Shuai Gong
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  2. Zhi-Liang Wang
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Correspondence to Zhi-Liang Wang.

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Gong, JS., Wang, ZL., Qu, HW. et al. Flexible bandpass filter on polyimide substrate. J Mater Sci: Mater Electron 32, 25137–25148 (2021). https://doi.org/10.1007/s10854-021-06968-2

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