Antenna Radiation Efficiency Considerations in Body Area Networks

Sarrazin, Julien; Valerio, Guido; Razafimahatratra, Solofo; Casaletti, Massimiliano; Benlarbi-Delaï, Aziz; Sarrazin, Francois; Petrillo, Luca; Doncker, Philippe De

doi:10.4108/eai.15-12-2016.2267658

Cited by 1 publication

(2 citation statements)

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“…The radiation efficiency has been computed for both the vertical dipole [11] and the vertically polarized aperture at different heights h T above the body in the 60 GHz-band. It is defined in Eq.…”

Section: Radiation Efficiencymentioning

confidence: 99%

“…All these studies do consider specific antenna topologies on a specific human body and it is therefore difficult to draw general conclusions. This is why an analytical approach was undertaken in our former study [11] to define on-body radiation efficiency and its dependence on frequency for a vertical dipole. However, the question of whether it is better to use an antenna with low or high directivity has not been investigated from an analytical point of view.…”

Section: Introductionmentioning

confidence: 99%

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Input Impedance of an Aperture Over a Lossy Half-Space: Application to on-Body Antenna Performance at 60 GHZ

Razafimahatratra¹,

Sarrazin²,

Valerio³

et al. 2018

PIER C

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This paper presents a theoretical approach to compare the performance of a directive and a quasi-omnidirectional on-body antennas. Two canonical antennas, namely, a dipole and a rectangular aperture, are considered in the 60 GHz band. We first demonstrate that for this on-body configuration, the classically-defined far-field antenna gain depends on the observation distance. Consequently, we derive results in terms of radiation efficiency and link budget. To do so, the antenna input impedance computation is a preliminary step to normalize the input power to allow a fair comparison between the two antennas. The impedance over a lossy half-plane of an aperture illuminated by a TE 10 mode normally polarized is therefore derived into a convenient easy-to-compute formulation, which to authors' best knowledge, is not available in the literature. In terms of link budget, it is obtained that the received power due to an aperture is generally higher than the one due to the dipole in the main lobe direction. A constant difference is observed along the distance, and this difference increases with the aperture width for antennas touching the body. Besides, it is shown that the standard aperture waveguide WR15 exhibits a slightly higher efficiency than a vertical dipole with the same vertical size when being placed at a distance less than 3 mm (i.e., 0.6λ) from the body phantom surface. Above this distance, the dipole and the aperture exhibit similar efficiency in the order of 60%.

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Section: Radiation Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%