Capacitively-coupled resonators for terahertz planar-Goubau-line filters
Artikel i vetenskaplig tidskrift, 2023

Low-loss planar Goubau lines show promising potential for terahertz applications. However, a single-wire waveguide exhibits less design freedom than standard multi-conductor lines, which is a significant constraint for realizing standard components. Existing filters for planar Goubau line lack clear design procedures preventing the synthesis of an arbitrary filter response. In this work, we present a design for a bandpass/bandstop filter for planar Goubau line by periodically loading the line with capacitively-coupled 𝜆∕2 resonators, which can be easily tuned by changing their electrical length. The filter’s working principle is explained by a proposed transmission-line model. We designed and fabricated a passband filter centered at 0.9 THz on a 10-𝜇m silicon-membrane substrate and compared measurement results between 0.5 THz and 1.1 THz to electromagnetic simulations, showing excellent agreement in both 𝑆11 and 𝑆21. The measured passband has an insertion loss of 7 dB and a 3-dB bandwidth of 31%. Overall, the proposed filter design has good performance while having a simple design procedure.

Filters

planar Goubau line

scattering parameters

terahertz waveguides

silicon membrane

periodic structures

single-metal strip

vector network analyzer (VNA)

on-wafer measurements

Författare

Juan Cabello Sánchez

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Vladimir Drakinskiy

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Jan Stake

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Helena Rodilla

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

IEEE Transactions on Terahertz Science and Technology

2156-342X (ISSN) 21563446 (eISSN)

Vol. 13 1 58-66

Styrkeområden

Informations- och kommunikationsteknik

Infrastruktur

Kollberglaboratoriet

Nanotekniklaboratoriet

Ämneskategorier

Annan elektroteknik och elektronik

Den kondenserade materiens fysik

DOI

10.1109/TTHZ.2022.3220599

Mer information

Senast uppdaterat

2023-07-14