In this paper, a new on-chip rat-race coupler, based on slow-wave coplanar stripline transmission lines, is proposed for 120 GHz applications. High quality factor transmission lines were employed. A parametric analysis targeting the geometrical variables of slow-wave is presented. A 19.6% area reduction for the core of the coupler is achieved thanks to slow-wave technique manifested in conductive ribbons placed under transmission lines. Simulation results show that isolation and reflection coefficients are preserved under 15 dB. Insertion loss value is 4.3 dB for the SW-CPS version at 120 GHz. Maximum amplitude imbalance is 0.6 dB reported at 140 GHz. While, phase imbalance difference for the proposed structure doesn't exceed 2.5° for the whole bandwidth of interest.

BiCMOS Rat-Race Coupler Based on Slow-Wave CPS Transmission lines for 120 GHz Applications

Boccia L.;Podevin F.;
2022-01-01

Abstract

In this paper, a new on-chip rat-race coupler, based on slow-wave coplanar stripline transmission lines, is proposed for 120 GHz applications. High quality factor transmission lines were employed. A parametric analysis targeting the geometrical variables of slow-wave is presented. A 19.6% area reduction for the core of the coupler is achieved thanks to slow-wave technique manifested in conductive ribbons placed under transmission lines. Simulation results show that isolation and reflection coefficients are preserved under 15 dB. Insertion loss value is 4.3 dB for the SW-CPS version at 120 GHz. Maximum amplitude imbalance is 0.6 dB reported at 140 GHz. While, phase imbalance difference for the proposed structure doesn't exceed 2.5° for the whole bandwidth of interest.
2022
978-1-6654-7110-7
BEOL
BiCMOS
coupler
CPS
millimeter-wave
on-chip
rat-race
slow-wave
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/354497
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