Single-Layer Dichroic Filters for Multifrequency Receivers at THz Frequencies
Reviewartikel, 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.

submillimeter wave

multifrequency receiver

Astronomical applications

single-layer

THz

dichroic

millimeter

frequency selective surface (FSS)

Författare

Daniel Montofre

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, GARD teknik

Andrey Khudchenko

Russian Academy of Sciences

Fausto Patricio Mena

Universidad de Chile (UCH)

Ronald Hesper

Rijksuniversiteit Groningen

Andrey M. Baryshev

Rijksuniversiteit Groningen

IEEE Transactions on Terahertz Science and Technology

2156-342X (ISSN)

Vol. 10 6 690-697

Ämneskategorier

Annan fysik

Signalbehandling

Annan elektroteknik och elektronik

DOI

10.1109/TTHZ.2020.3025692

Mer information

Senast uppdaterat

2020-12-03