First, we report on the design, simulation and measurement of a 2-4 GHz conformable antenna optimized for skin contact and implemented on a flexible printed circuit for integration into a wearable device. Second, we experimentally verify the suitability of appropriately long (~10 cm) microstrip traces for the wearable system signal distribution network, which features varying radii of curvature. Consequently, the contribution of the here reported work is two-fold. First, the experimental results obtained both with breast phantoms and on-body measurements, demonstrate a return loss below -10 dB in the desired frequency band. Phantom results also show a through-breast transmission coefficient of above -40 dB at the centre frequency of 3 GHz. Second, and essential for signal integrity in our target application, the results show that the longitudinal curvature of such a microstrip does not increase transmission line losses.
Document Object Identifier (DOI)
Porter, E., Walls, G., Zhou, Y., Popović, M., & Schwartz, J. D. (2014). A flexible broadband antenna and transmission line network for a wearable microwave breast cancer detection system. Progress in Electromagnetics Research Letters, 49, 111-118.
Progress in Electromagnetics Research Letters