Poster Presentation

WAVEGUIDE STRUCTURE DESIGN FOR A SIDEBAND-SEPARATING HETERODYNE RECEIVER OPERATING IN THE 211-275 AND 300-375 GHZ FREQUENCY BAND

Author(s): Gregory Nazarov (ASC LPI, IRE RAS), Kirill Rudakov (ASC LPI), Ivan Tretyakov (ASC LPI), Yaromir Vodzianovskiy (ASC LPI), Lyudmila Filippenko (IRE RAS), Valery Koshelets (IRE RAS), Sergey Likhachev (ASC LPI), Andrey Khudchenko (ASC LPI)

Presenter: Gregory Nazarov (Astro Space Center of Lebedev Physical Institute (ASC LPI))

Waveguide structures for a sideband-separating receiver operating in the 211–275 GHz and 300–375 GHz bands were developed using finite element simulations. The main goals of the optimization were to ensure manufacturability with relatively large milling tool diameters (100–150 µm) and to achieve low reflection in the waveguide hybrid, not exceeding –25 dB over 90% of the operating bandwidth.

We present the measurement results for a fabricated sideband-separating block covering the 211–275 GHz band, demonstrating an average sideband rejection of no less than 10 dB across the entire range.

The results of this work can be applied directly in the development of the onboard instrumentation for the space observatory Millimetron. In addition, they will be utilized for future Russian submillimeter ground-based telescope.