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Maximising the power extracted from UTC photodiodes is central to the successful realisation of photonic terahertz emitters. For antenna integrated UTCs this requires the optimisation of the impedance match between UTCs and antennas. We present a comprehensive investigation of the UTC output impedance up to 400 GHz, by means of a semi-analytical approach and using 3D full-wave modelling. We introduce...
Tunnel transistor (TFET) is a potential steep slope device enabling supply voltage scaling. TFET is explored at the device and circuit level. Hetero-junction TFET is demonstrated with high drive current and high on-off current ratio. Hetero-junction TFETs with scaled device geometry can outperform Si FinFET at Vcc<;0.3V. Design considerations of TFET based circuits for logic and SRAM applications...
We demonstrate an analysis of the metamaterials medium consisting of SRRs (split ring resonators) integrated with nonlinear microwave components based on a circuit and 3D electromagnetic wave co-simulation method. The simulations are performed by using Wavenology EM, which is an efficient multiphysics and multiscale wave simulator. Our investigations show that the resonant frequency of the SRR loaded...
The reduction in peak SAR for handset with monopole type antenna using Rcard is investigated numerically and experimentally. Numerical results suggest that implementation of R-card with low impedance levels in a sense to cover the antenna feed can effectively reduce the peak SAR values in the human head for both 1g and 10g cases. Such observation has been validated experimentally, and a peak SAR reduction...
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