A Capacitive-Gap Coupled Terahertz Planar-Goubau-Line Power Divider
Journal article, 2023
The planar Goubau line is a single-conductor waveguide with a low attenuation constant at terahertz frequencies compared to other planar waveguides. However, its single-conductor nature complicates the design of circuit elements compared to multi-conductor waveguides, especially when impedance transformation is needed, like in the case of power dividers. In this paper, we present a power divider for a planar Goubau line based on capacitive-gap coupled lines, providing a matched input port. A 900-GHz equal power divider was fabricated on a suspended silicon membrane and was characterized with a Vector Network Analyzer and terahertz probes between 0.5 THz and 1.1 THz. Simulations and measurements are in good agreement, the measured input return loss is lower than 15dB at the design frequency, and the average coupler loss is estimated to be lower than 1 dB when de-embedding the feeding lines.
Power measurement
Frequency measurement
On-wafer measurements
terahertz
scattering parameters
planar Goubau lines
power dividers
Frequency conversion
Silicon
vector network analyzers (VNA)
Power dividers
Scattering parameters
silicon membrane
splitters
Probes
Author
Juan Cabello Sánchez
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Vladimir Drakinskiy
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Jan Stake
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Helena Rodilla
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
IEEE Transactions on Terahertz Science and Technology
2156-342X (ISSN) 21563446 (eISSN)
Vol. 13 6 698-703Terahertz Technology for Probing Picosecond Protein Dynamics under Physiological Conditions
Swedish Research Council (VR) (2020-05087), 2021-01-01 -- 2023-12-31.
Development of the national infrastructure for microwave and terahertz characterization: expanding the use of the electromagnetic spectrum
Swedish Research Council (VR) (2020-06187), 2021-01-01 -- 2024-12-31.
Areas of Advance
Information and Communication Technology
Infrastructure
Kollberg Laboratory
Myfab (incl. Nanofabrication Laboratory)
Subject Categories (SSIF 2011)
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/TTHZ.2023.3303849