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Note: cryogenic microstripline-on-Kapton microwave interconnects.

A I Harris1, M Sieth, J M Lau

  • 1Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA. harris@astro.umd.edu

The Review of Scientific Instruments
|September 4, 2012
PubMed
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Simple microwave interconnects using flex circuit technology perform well for heterodyne radiometer arrays. These circuits show good electrical performance and thermal conductivity at low temperatures, balancing crosstalk and heat flux.

Area of Science:

  • Electrical Engineering
  • Cryogenic Engineering
  • Materials Science

Background:

  • Increasing the size of focal plane heterodyne radiometer arrays requires simple broadband microwave interconnects.
  • Flex circuit technology offers a potential solution for these interconnects.

Purpose of the Study:

  • To measure the electrical performance (loss and crosstalk) of microstrip transmission lines in flex circuit technology at 297 K and 77 K.
  • To evaluate the thermal conductivity of these interconnects and compare it to traditional coaxial cables.
  • To investigate the impact of a patterned ground plane on heat flux.

Main Methods:

  • Fabrication of microstrip transmission line arrays using flex circuit technology.
  • Electrical measurements of loss and crosstalk at 297 K and 77 K up to 20 GHz.

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  • Thermal conductivity measurements and comparison with stainless steel coaxial cable.
  • Testing of a patterned ground plane design to mitigate heat flux.

    • Main Results:

    • Good electrical performance, including low loss and crosstalk, was observed up to 20 GHz at both 297 K and 77 K.
    • The dielectric constant of Kapton substrates remained stable, while electrical loss decreased at 77 K.
    • The printed circuit structure exhibited thermal conductivities comparable to stainless steel coaxial cable.
    • A patterned ground plane was effective in reducing heat flux.

    Conclusions:

    • Flex circuit microstrip interconnects are suitable for cryogenic applications in heterodyne radiometer arrays.
    • Performance tradeoffs exist between crosstalk and thermal conductivity, manageable through design choices like patterned ground planes.
    • The stable dielectric properties and reduced loss at cryogenic temperatures make Kapton-based flex circuits a viable option.