G-Band Mode-Coupler-Based Si Dielectric Waveguide for Multidrop Sub-THz Interconnect

This letter presents a G-band mode-coupler-based multimode Si dielectric waveguide (DWG) for multidrop sub-THz/THz interconnect. Three types of mode couplers, i.e., quasi-transverse electromagnetic (TEM) to E_{11}^y mode, E_{11}^y to E_{21}^y mode, and E_{11}^y to E_{31}^y mode, are design...

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Bibliographic Details
Published in:IEEE microwave and wireless technology letters (Print) 2023-06, Vol.33 (6), p.1-4
Main Authors: Ding, Xuan, Yu, Hai, Sabbaghi, Sajjad, Gu, Q. Jane
Format: Article
Language:English
Subjects:
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Bandwidth
Communication
Couplers
Couplings
Crosstalk
dielectric waveguide (DWG)
Dielectric waveguides
Electromagnetic waveguides
G-band
Integrated circuit interconnections
interconnect
Microstrip transmission lines
mode coupler
multidrop
nano-manufacturing
Optical waveguides
quasi-transverse electromagnetic (TEM)
Silicon
sub-THz
THz
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Summary:This letter presents a G-band mode-coupler-based multimode Si dielectric waveguide (DWG) for multidrop sub-THz/THz interconnect. Three types of mode couplers, i.e., quasi-transverse electromagnetic (TEM) to E_{11}^y mode, E_{11}^y to E_{21}^y mode, and E_{11}^y to E_{31}^y mode, are designed and demonstrated. The quasi-TEM to E_{11}^y coupler works as microstrip line (MSL)-to-DWG transition. E_{11}^y to E_{21}^y and E_{11}^y to E_{31}^y mode couplers enable two more mode transmissions along the bus waveguide through the dedicated couplers where the phase match condition is satisfied. Tapers are used as the smooth transition between DWG sections, as well as mode filters to reduce the crosstalk between modes in (de)multiplexers. The measured minimum transition loss is about 5 dB with the 3-dB bandwidth of 143-200, 151-185, and 155-174 GHz for the three modes, respectively, and the measured crosstalk between modes is less than - 26 dB.
ISSN:2771-957X
2771-9588
DOI:10.1109/LMWT.2023.3239624