Loading...
Please wait, while we are loading the content...
Similar Documents
Wave Propagation through Vegetation at 3.1 GHz and 5.8 GHz
| Content Provider | Semantic Scholar |
|---|---|
| Author | Johannesson, Peter |
| Copyright Year | 2001 |
| Abstract | A model for vegetation attenuation, based on the total cross section for leaves and branches, has been developed. The model is valid for microwave propagation in general but the analysis has been made with the emphasize on the frequencies 3.1 GHz and 5.8 GHz with application to Fixed Wireless Access. Since the scattering bodies, i.e. the leaves and the branches, are of the same size as the wavelength, resonance effects will occur. To calculate the scattered electric field in the far zone, under these circumstances, the T-matrix method has been applied. This method is applicable to arbitrarily shaped particles and can thus be applied to axisymmetric particles, i.e. bodies-of-revolution. Leaves have been modeled as thin lossy dielectric oblate spheroids and the branches as finitely-long lossy circular dielectric cylinders. A detailed analysis of different models in different frequency regions has been performed together with a survey of commonly used microwave models. These existing models are foremost used when short wave approximations, i.e. physical optics, or long wave approximations, Rayleigh scattering, can be done. In the short and long wave approximations the branches are modeled in the same way as in the T-matrix method. The leaves are, on the contrary, modeled as flat-circular lossy dielectric discs. In the analysis has multiple scattering effects been neglected. The results from the simulations are compared to measurements that were made on a large test beech. Wave Propagation through Vegetation at 3.1 GHz and 5.8 GHz |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.odessaoffice.com/wireless/TEAT-5039.pdf |
| Alternate Webpage(s) | http://invictusnetworks.com/faq/RF%20Technical%20Info%20and%20FCC%20Regs/RF%20Wave%20Vegitation%20Propagation.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
