RF performance evaluation of microstrip lines printed on flexible polyethylene terephthalate (PET) films

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Abstract

This paper reports an exploratory study of implementing microstrip lines in flexible electronics technology by printing conductive tracks on flexible polyethylene terephthalate (PET) films. Based on the material properties of inkjet printable nanoparticles and of PET films published in the literature, electromagnetic-field simulations with COMSOL are used to determine the radio-frequency (RF) performance of the microstrip lines. With a PET film thickness of 250 μm, a conductive track with a linewidth of 565 μm and a conductive layer thickness of 20 μm above a ground plane gives a characteristic impedance of 50 Ω as a microstrip line. Because of the large thickness of the conductive layer relative to the skin depth, the insertion loss at 1 GHz for such microstrip lines can be as small as 0.25 dB/cm even with the conductivity as low as 5×105 S/m. With the 50-Ω microstrip line design, the characteristic impedance is fairly independent of the conductivity of the printed conductor. Printing resolution of about 100 μm is good enough for printing microstrip lines on PET films of normal thickness.

Original languageEnglish
Title of host publication2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IEEE MTT-S IMWS-AMP 2015 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479964505
DOIs
Publication statusPublished - 10 Nov 2015
EventIEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IEEE MTT-S IMWS-AMP 2015 - Suzhou, China
Duration: 1 Jul 20153 Jul 2015

Publication series

Name2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IEEE MTT-S IMWS-AMP 2015 - Proceedings

Conference

ConferenceIEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IEEE MTT-S IMWS-AMP 2015
Country/TerritoryChina
CitySuzhou
Period1/07/153/07/15

Keywords

  • inkjet printing
  • microstrip line
  • polyethylene terephthalate (PET)
  • printed electronics
  • radio-frequency

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