# Multi-Branch Multilayer Perceptron

Large-area tactile sensing has meant tiling many sensing units and routing a wire to each, so scaling area or resolution drives up wiring and cost. A serpentine electromagnetic surface-wave transmission line on flexible polyimide is fed swept signals from both ends, and the dual-port reflection spectra encode contact position, which a multi-branch multilayer perceptron decodes into coordinates. Two prototypes an order of magnitude apart in area, 5×5 and 16×18 cm, both exceed a super-resolution factor of 10,000, with two-dimensional localization RMSE of 0.368 mm for the small skin and 1.209 mm for the large one.

Large-area tactile sensing has meant tiling many sensing units and routing a wire to each, so scaling area or resolution drives up wiring and cost. A serpentine electromagnetic surface-wave transmission line on flexible polyimide is fed swept signals from both ends, and the dual-port reflection spectra encode contact position, which a multi-branch multilayer perceptron decodes into coordinates. Two prototypes an order of magnitude apart in area, 5×5 and 16×18 cm, both exceed a super-resolution factor of 10,000, with two-dimensional localization RMSE of 0.368 mm for the small skin and 1.209 mm for the large one.