PIER Letters
Progress In Electromagnetics Research Letters
ISSN: 1937-6480
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By E. Porter, G. Walls, Y. Zhou, M. Popovic, and J. D. Schwartz

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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.

E. Porter, G. Walls, Y. Zhou, M. Popovic, and J. D. Schwartz, "A Flexible Broadband Antenna and Transmission Line Network for a Wearable Microwave Breast Cancer Detection System," Progress In Electromagnetics Research Letters, Vol. 49, 111-118, 2014.

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