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 dividers
terahertz
Power measurement
On-wafer measurements
splitters
silicon membrane
vector network analyzers (VNA)
Silicon
Scattering parameters
Power dividers
Probes
Frequency conversion
Frequency measurement
planar Goubau lines
scattering parameters
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 6 698-703Areas of Advance
Information and Communication Technology
Infrastructure
Kollberg Laboratory
Nanofabrication Laboratory
Subject Categories
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/TTHZ.2023.3303849