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On-chip CMOS THz resonant cell using hybrid coplanar-waveguide T-stub/defected ground structure

In this paper, a compact low-loss mutual-coupled resonant cell is proposed for terahertz (THz) on-chip passive circuit design using a scaling CMOS technology. This cell is consisted of a hybrid coplanar-waveguide (CPW) short-circuited T-stub/defected ground structure (DGS) with horizontal coupling to ground plane, which allocates dual-resonance with low-loss. To reduce the loss due to the silicon substrate and suppress spurious noises at the input/output (I/O) port, a defected CPW structure with float-shield is implemented and utilized. By exciting the resonant cell with an interdigital coupled topology, a on-chip dual-band bandpass filter operating at THz bands is designed and fabricated using a CMOS technology. Under detail calibrations and on-chip de-embedding for several test set-ups, the measured results show a reasonable agreement with those obtained from the full-wave electromagnetic-simulator, and demonstrate the novelty of the proposed THz resonant cell with dual-band application.