We present the design, manufacturing technique, and characterization of a 3D-printed broadband graded index millimeter wave absorber. The absorber is additively manufactured using a fused filament fabrication (FFF) 3D printer out of a carbon-loaded high impact polystyrene (HIPS) filament and is designed using a space-filling curve to optimize manufacturability using said process. The absorber's reflectivity is measured from 63 GHz to 115 GHz and from 140 GHz to 215 GHz and is compared to electromagnetic simulations. The intended application is for terminating stray light in Cosmic Microwave Background (CMB) telescopes, and the absorber has been shown to survive cryogenic thermal cycling.
@article{arxiv.1808.00820,
title = {A 3D-printed broadband millimeter wave absorber},
author = {Matthew Petroff and John Appel and Karwan Rostem and Charles L. Bennett and Joseph Eimer and Tobias Marriage and Joshua Ramirez and Edward J. Wollack},
journal= {arXiv preprint arXiv:1808.00820},
year = {2019}
}
Comments
6 pages, 6 figures, 2 tables, accepted to Review of Scientific Instruments