Summary
International Symposium on Antennas and Propagation
2010
Session Number:2WD2
Session:
Number:2WD2-2
Vegetation Attenuation by a Single Tree for High Elevation Angles at 2.0 and 6.5 GHz
Petr Horak, Pavel Pechac,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
With the new requirements imposed on wireless satellite services, such as a wide range of services, mobility, availability, etc., the need has arisen to investigate the propagation channel for high elevation angles under vegetation blockage conditions. The appearance of a forested medium in the path of a satellite, terrestrial or any microwave communication link has a significant effect on the quality of the received signal. Over the past fifty years a number of measurement campaigns and theoretical works focused on investigating vegetation attenuation have been carried out [1-6]. In addition, a number of models describing the influence of vegetation blockage on electromagnetic wave propagation have been developed. The measurement trials can be broken down according to several aspects; as a measurement scenario, in terms of frequency, elevation angle or vegetation arrangement, etc. This paper presents some of the initial results of an ongoing, extensive measurement campaign focusing on shadowing by vegetation for mobile satellite services. Results for the frequency dependence of vegetation attenuation in forested environments have already been introduced in [7]. This paper addresses vegetation attenuation by a single tree. Empirical data obtained in both the summer and winter seasons for wide range of elevation angles are analyzed at two different frequencies. The paper is organized as follows. In Section 2 the measurement setup, scenario and data processing are presented. Section 3 describes the results from the summer and winter trials and a brief summary concludes the paper in Section 4.