毫米波吸收体的3D打印模具制作方法
Production Method of Millimeter-Wave Absorber with 3D-Printed Mold
摘要：
我们通过使用3D打印模具建立了良好的毫米波吸收体的生产方法。模具具有周期性的金字塔形状，并且吸收材料填充到模具中。这种形状减少了表面反射。3D打印模具由毫米波范围内的透明材料制成。因此，不需要脱模。这种生产方法的一个显著优点是易于使用各种形状和各种吸收材料进行原型制作。我们制作了一个测试模型，并使用双组分环氧树脂密封剂作为吸收材料。测试模型实现了低反射率：100 GHz时的$\sim 1\%$。对于使用超导探测器的情况，吸收体有时保持在低温条件下。因此，在用于热循环的机械强度、粘合强度和足够的导热性方面，需要低温性能。我们通过将模型浸入液氮浴中来确认测试模型的强度。
英文摘要：
We established a production method of a good 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: $\sim 1\%$ 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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