title: The effect on wireless sensor communication when deployed in biomass.
abstract: Wireless sensor networks (WSN) have been studied in a variety of scenarios over recent years, but work has almost exclusively been done using air as the transmission media. In this article some of the challenges of deploying a WSN in a heterogeneous biomass, in this case silage, is handled. The dielectric constant of silage is measured using an open-ended coaxial probe. Results were successfully obtained in the frequency range from 400 MHz to 4 GHz, but large variations suggested that a larger probe should be used for more stable results. Furthermore, the detuning of helix and loop antennas and the transmission loss of the two types of antennas embedded in silage was measured. It was found that the loop antenna suffered less from detuning but was worse when transmitting. Lastly, it is suggested that taking the dielectric properties of silage into account during hardware development could result in much better achievable communication range.
authors.affiliation: Department of Biosystems Engineering, Faculty of Agricultural Sciences, Aarhus University, Blichers Alle 20, P.O. Box 50, Tjele DK-8830, Denmark. JakobJuul.Larsen@agrsci.dk
authors.forename: Jakob Juul
authors.initials: JJ
authors.lastname: Larsen
authors.forename: Ole
authors.initials: O
authors.lastname: Green
authors.forename: Esmaeil S
authors.initials: ES
authors.lastname: Nadimi
authors.forename: Thomas Skjødeberg
authors.initials: TS
authors.lastname: Toftegaard
mesh_terms: D018533:Biomass; D011846:Radio Waves