Simulating electromagnetic transfer function from the transmission antennae to the sensors vicinity in LiteBIRD

M. Tsuji; M. Tsujimoto; Y. Sekimoto; T. Dotani; M. Shiraishi

doi:10.1117/12.2560899

13 December 2020 Simulating electromagnetic transfer function from the transmission antennae to the sensors vicinity in LiteBIRD

M. Tsuji, M. Tsujimoto, Y. Sekimoto, T. Dotani, M. Shiraishi

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114436F (2020) https://doi.org/10.1117/12.2560899
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The electromagnetic interference (EMI) is becoming an increasingly important factor in the spacecraft design equipped with highly sensitive detectors. This is particularly the case for LiteBIRD, in which the TES bolometers are exposed to space through the optical path. A particular concern is radiative interference caused by the X-band transmission during the ground communication. As the end-to-end verification test will be conducted in a later phase of the development, we need to derisk the concern early using simulation. In this report, we present the result of the EMI effects in the 1-GHz frequency range based on the electromagnetic simulation using a finite difference time domain (FDTD) solver. We modeled the dominant large structures of the spacecraft, calculated the spatial transmission of the antenna power, and estimated the electric field strength at the detector focal plane. The simulation results helped constrain aspects of the LiteBIRD satellite, such as the forward/backward ratio of the transmission antenna, to reduce the coupling between the antenna and the detectors.

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M. Tsuji, M. Tsujimoto, Y. Sekimoto, T. Dotani, and M. Shiraishi "Simulating electromagnetic transfer function from the transmission antennae to the sensors vicinity in LiteBIRD", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114436F (13 December 2020); https://doi.org/10.1117/12.2560899

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