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Depolarization due to wedge diffraction in satellite radiowave communication

Regmi, Ankit; Islam, Rafiqul; Pärssinen, Aarno; Berg, Markus (2020-07-08)

 
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https://doi.org/10.23919/EuCAP48036.2020.9135519

Regmi, Ankit
Islam, Rafiqul
Pärssinen, Aarno
Berg, Markus
Institute of Electrical and Electronics Engineers
08.07.2020

A. Regmi, M. R. Islam, A. Pärssinen and M. Berg, "Depolarization Due to Wedge Diffraction in Satellite Radiowave Communication," 2020 14th European Conference on Antennas and Propagation (EuCAP), Copenhagen, Denmark, 2020, pp. 1-4, doi: 10.23919/EuCAP48036.2020.9135519

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doi:https://doi.org/10.23919/EuCAP48036.2020.9135519
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https://urn.fi/URN:NBN:fi-fe2020071347266
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Abstract

In this paper, the depolarization effect due to the electromagnetic wave diffraction from the rooftop wedge of a building at 1.575 GHz frequency is presented. Diffraction measurement was performed using a dual circularly polarized (CP) antenna system. The Right Hand Circularly Polarized (RHCP) Global Positioning System (GPS) satellite transmission was utilized for measurement. The orbital motion of a single satellite enabled diffraction measurement as a function of the receiver depth in the shadow region, while the receiver was static. The experimental result of RHCP signal was compared with a theoretical knife-edge diffraction model, and they were in good agreement. In case of the deep shadow region, we found the levels of left- and right circular polarized signals to be equal, which indicates a strong depolarization of the incident RHCP wave. The observed depolarization for conductive wedge is explained by the geometrical theory of diffraction.

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