Production method of millimeter-wave absorber with 3D-printed mold

S. Adachi; M. Hattori; F. Kanno; K. Kiuchi; T. Okada; O. Tajima

doi:10.1063/1.5132871

Production method of millimeter-wave absorber with 3D-printed mold

S. Adachi, M. Hattori, F. Kanno, K. Kiuchi, T. Okada, O. Tajima

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We established a production method of a millimeter-wave absorber by using a 3D-printed mold. The mold has a periodic pyramid shape, and an absorptive material is filled into the mold. This shape reduces the surface reflection. The 3D-printed mold is made from a transparent material in the millimeter-wave range. Therefore, unmolding is not necessary. A significant benefit of this production method is easy prototyping with various shapes and various absorptive materials. We produced a test model and used a two-component epoxy encapsulant as the absorptive material. The test model achieved a low reflectance: ∼1% at 100 GHz. The absorber is sometimes maintained at a low temperature condition for cases in which superconducting detectors are used. Therefore, cryogenic performance is required in terms of a mechanical strength for the thermal cycles, an adhesive strength, and a sufficient thermal conductivity. We confirmed the test-model strength by immersing the model into a liquid-nitrogen bath.

Original language	English
Article number	016103
Journal	Review of Scientific Instruments
Volume	91
Issue number	1
DOIs	https://doi.org/10.1063/1.5132871
Publication status	Published - 2020 Jan 1

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title = "Production method of millimeter-wave absorber with 3D-printed mold",

abstract = "We established a production method of a millimeter-wave absorber by using a 3D-printed mold. The mold has a periodic pyramid shape, and an absorptive material is filled into the mold. This shape reduces the surface reflection. The 3D-printed mold is made from a transparent material in the millimeter-wave range. Therefore, unmolding is not necessary. A significant benefit of this production method is easy prototyping with various shapes and various absorptive materials. We produced a test model and used a two-component epoxy encapsulant as the absorptive material. The test model achieved a low reflectance: ∼1% at 100 GHz. The absorber is sometimes maintained at a low temperature condition for cases in which superconducting detectors are used. Therefore, cryogenic performance is required in terms of a mechanical strength for the thermal cycles, an adhesive strength, and a sufficient thermal conductivity. We confirmed the test-model strength by immersing the model into a liquid-nitrogen bath.",

author = "S. Adachi and M. Hattori and F. Kanno and K. Kiuchi and T. Okada and O. Tajima",

note = "Funding Information: We would like to thank Stratasys Japan Ltd. for fabrication of the 3D-printed mold. We thank Shugo Oguri and Taketo Nagasaki for assistance with the optics simulations and Minoru Hirose for technical assistance with the absorber production. We also thank Akito Kusaka and Frederick T. Matsuda for the useful discussion. This work was supported by JSPS KAKENHI, Grant Nos. JP18J01039 and JP17H06134, and SPIRITS, which is the internal grant of Kyoto University. Publisher Copyright: {\textcopyright} 2020 Author(s).",

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AU - Okada, T.

AU - Tajima, O.

N1 - Funding Information: We would like to thank Stratasys Japan Ltd. for fabrication of the 3D-printed mold. We thank Shugo Oguri and Taketo Nagasaki for assistance with the optics simulations and Minoru Hirose for technical assistance with the absorber production. We also thank Akito Kusaka and Frederick T. Matsuda for the useful discussion. This work was supported by JSPS KAKENHI, Grant Nos. JP18J01039 and JP17H06134, and SPIRITS, which is the internal grant of Kyoto University. Publisher Copyright: © 2020 Author(s).

PY - 2020/1/1

Y1 - 2020/1/1

N2 - We established a production method of a millimeter-wave absorber by using a 3D-printed mold. The mold has a periodic pyramid shape, and an absorptive material is filled into the mold. This shape reduces the surface reflection. The 3D-printed mold is made from a transparent material in the millimeter-wave range. Therefore, unmolding is not necessary. A significant benefit of this production method is easy prototyping with various shapes and various absorptive materials. We produced a test model and used a two-component epoxy encapsulant as the absorptive material. The test model achieved a low reflectance: ∼1% at 100 GHz. The absorber is sometimes maintained at a low temperature condition for cases in which superconducting detectors are used. Therefore, cryogenic performance is required in terms of a mechanical strength for the thermal cycles, an adhesive strength, and a sufficient thermal conductivity. We confirmed the test-model strength by immersing the model into a liquid-nitrogen bath.

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Production method of millimeter-wave absorber with 3D-printed mold

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