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<p>We developed an absorber for radio waves, covering Ka-band (26.5–40 GHz), using a production method with a pyramid-shaped 3D-printed mold. The absorptive material, a mixture of epoxy adhesive (STYCAST 2850-FT) and carbon fiber (Mitsubishi-K223HE) at a weight ratio of 0.15%, is filled into the mold to form a pyramidal structure to suppress the reflection. In this work, we optimized it to the Ka-band by increasing the height of pyramids. We measured the reflectivity at room temperature and showed that a reflectivity averaged over the Ka-band is achieved 0.4%, which is significantly suppressed from 2.4% in the previous work. We also showed that the reflectivity is maintained below 1% over the broad frequency range of 26.5–95 GHz. Furthermore, we developed a method to evaluate the optical constants of the filling material at around liquid helium temperature. We found that the optical constants of the material remain temperature-independent from cryogenic to room temperature, confirming that the reflectivity of the absorber measured at room temperature ensures the performance at cryogenic temperature.</p>

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Development of Radio Absorber for Cryogenic Applications Covering Ka-band

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • T. Tanaka,
  • Y. Kasai,
  • S. Adachi,
  • A. Takeuchi,
  • M. Hattori,
  • O. Tajima

摘要

We developed an absorber for radio waves, covering Ka-band (26.5–40 GHz), using a production method with a pyramid-shaped 3D-printed mold. The absorptive material, a mixture of epoxy adhesive (STYCAST 2850-FT) and carbon fiber (Mitsubishi-K223HE) at a weight ratio of 0.15%, is filled into the mold to form a pyramidal structure to suppress the reflection. In this work, we optimized it to the Ka-band by increasing the height of pyramids. We measured the reflectivity at room temperature and showed that a reflectivity averaged over the Ka-band is achieved 0.4%, which is significantly suppressed from 2.4% in the previous work. We also showed that the reflectivity is maintained below 1% over the broad frequency range of 26.5–95 GHz. Furthermore, we developed a method to evaluate the optical constants of the filling material at around liquid helium temperature. We found that the optical constants of the material remain temperature-independent from cryogenic to room temperature, confirming that the reflectivity of the absorber measured at room temperature ensures the performance at cryogenic temperature.