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- On-body off-body dual mode microstrip antenna for Body Area Network applicationsPublication . Mendes, Carlos; Peixeiro, CustódioThis paper describes the design, fabrication and test of a novel dual mode, on-body and off-body, planar microstrip antenna for Body Area Networks applications. The on-body antenna is obtained with a microstrip ring operating at a higher order mode while the off-body antenna is obtained with a meandered microstrip antenna. The antennas are fed separately but share a common ground plane and are disposed so that the occupied area is minimized.
- Fabrication, measurement and time decay of the electromagnetic properties of semi-solid water-based phantomsPublication . Mendes, Carlos; Peixeiro, CustódioThis paper presents a complete and detailed description of the fabrication and measurement of the electromagnetic properties of water-based semi-solid phantoms with emphasis on the analysis of the time evolution of the complex permittivity of several samples stored in different conditions. A known recipe for a 2/3 muscle equivalent phantom is used as test material, and the several phantom sample properties are measured with an in-house developed coaxial probe technique. It is shown that the storing condition is of paramount importance to extend the lifetime of a given phantom. This behavior stems from the way the storing condition affects the water evaporation rate of the sample. In particular, while an unprotected sample can preserve its electromagnetic properties only for a few days, a very well-sealed one can last at least up to a year.
- A Dual-Mode Single-Band Wearable Microstrip Antenna for Body Area NetworksPublication . Mendes, Carlos; Peixeiro, CustódioDesign, fabrication, and test of a novel single-band wearable antenna with dual-mode operation (on-body and offbody) for body area network’s applications in the 2.45 GHz industrial scientific and medical band are presented. The on-body mode is achieved with a microstrip ring while the off-body mode is obtained with a compact meanderedmicrostrip patch placed inside the ring. The two antennas are fed separately but share a common ground plane and use only fabricmaterials facilitating the integration into the user’s clothes. The antenna operation is characterized when placed on a phantom mimicking a human torso. Input match, mutual coupling, radiation pattern, radiation efficiency, and path loss measurements are presented and show good agreement with simulations.