Single-Layer Dichroic Filters for Multifrequency Receivers at THz Frequencies
Journal article, 2020

In this work, we report the design, construction, and characterization of two free-standing single-layer frequency-selective surface structures to be used as dichroic filters in the THz range. Their spectral responses are aimed to fulfill a stringent band-pass performance in the atmospheric window between 600 and 725 GHz. Specifically, the dichroics have been required to allow a transmission of electromagnetic radiation of at least 90%, achieve a rejection in the stop-band lower than -25 dB, and have cross-polarization levels below -30 dB. All these specifications were demanded to be satisfied at normal and nonnormal beam incidence. We have studied dichroic filters with hexagonal patterns of two different apertures, a well-known single-hole geometry and, in order to enhance the spectral performance, a novel aperture geometry that we call the flower type. Their transmission characteristics were measured using a Fourier transform spectrometer. The electromagnetic simulations and experimental results not only show a good agreement but they demonstrate that the flower-type geometry can greatly outperform its single-hole counterpart achieving all the desired requirements. In this way, we demonstrate the feasibility of implementing single-layer systems at (sub)-THz frequencies suitable for low-noise astronomical applications.

millimeter

Astronomical applications

single-layer

submillimeter wave

THz

dichroic

multifrequency receiver

frequency selective surface (FSS)

Author

Daniel Montofre

Chalmers, Space, Earth and Environment, Onsala Space Observatory

University of Chile (UCH)

Andrey Khudchenko

Russian Academy of Sciences

Fausto Patricio Mena

University of Chile (UCH)

Ronald Hesper

University of Groningen

Andrey M. Baryshev

University of Groningen

IEEE Transactions on Terahertz Science and Technology

2156-342X (ISSN) 21563446 (eISSN)

Vol. 10 6 690-697 9201553

Subject Categories

Other Physics Topics

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TTHZ.2020.3025692

More information

Latest update

4/5/2022 6