Crosstalk and Leakage Suppression by Mode Selectivity and Conversion in Terahertz Hybrid Metallo-Dielectric Waveguide Crossover and Intersections

Hybrid metallo-dielectric waveguide (HMDW) crossover is proposed and presented in this work. Two parallel metal plates over two intersecting dielectric waveguide (DW) areas create a nonradiative dielectric (NRD) waveguide intersection that is harnessed to avoid the inherent radiation/leakage loss ef...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques Vol. 72; no. 12; pp. 6943 - 6955
Main Authors: Liu, Chun-Mei, Carignan, Louis-Philippe, Wu, Ke
Format: Journal Article
Language:English
Published: New York IEEE 01.12.2024
Institute of Electrical and Electronics Engineers (IEEE)
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Conductors
Crossover
Crossovers
Crosstalk
crosstalk reduction
Dielectric waveguides
dielectric waveguides (DWs)
Dielectrics
Electromagnetic waveguides
hybrid metallo-dielectric waveguides (HMDWs)
Insertion loss
Leak detection
Leakage
leakage reduction
Metal plates
Metallic materials
Metallography
mode conversion
mode selectivity
nonradiative dielectric (NRD) waveguides
Propagation losses
terahertz (THz)
Terahertz radiation
Wave propagation
Waveguide components
ISSN:0018-9480, 1557-9670, 1557-9670
Online Access:Get full text
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Summary:Hybrid metallo-dielectric waveguide (HMDW) crossover is proposed and presented in this work. Two parallel metal plates over two intersecting dielectric waveguide (DW) areas create a nonradiative dielectric (NRD) waveguide intersection that is harnessed to avoid the inherent radiation/leakage loss effect of such open DW discontinuities. Straight DW sections far from the intersection are set to minimize conductor loss free from any metal plates. Furthermore, crosstalk can be significantly reduced due to the mode conversion over the NRD waveguide intersection and the mode selectivity of the HMDW architecture. The proposed HMDW crossover has a lower structural insertion loss (material losses are excluded) of 0.37 dB from 275 to 295 GHz, whereas DW crossover and NRD crossover have 1.5 dB of insertion loss. The HMDW architecture is applied to a 10-mm back-to-back alumina-based waveguide with four orthogonal dielectric strips. The metal plates of NRD covering all intersections with a designed width can prevent the EM wave from propagating to four orthogonal dielectric strips. The fabricated prototype has a measured insertion loss of about 5.5 dB from 262 to 286 GHz (4.8 dB in simulation from 262 to 288 GHz). While the hybrid waveguide has a higher loss than its dielectric counterpart, it allows multiple orthogonal guides to cross-pass, providing an alternative solution for integrated systems where intersecting paths are inevitable. Its structural simplicity is beneficial to THz manufacturing.
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ISSN:0018-9480
1557-9670
1557-9670
DOI:10.1109/TMTT.2024.3410868