DESIGN AND REALIZATION OF AN AUTO-FOCUS ANTENNA ARRAY FOR SATELLITE COMMUNICATIONS

Abstract : Nowadays, receiving signals from geostationary satellites is performed using parabolic antennas composed of a metal reflector and a LNB (Low Noise Block) placed at the focus of the parabola. This antenna is widely used because of its performance and cost. However, this kind of antenna suffers from inherent shortcomings (3D antenna, fixed beam). To find an alternative to the existing,the design of a planar, broadband (20% BP), dual-polarization, high gain (29dBi), electronically steerable and low cost antenna is proposed for the reception of TV signals from satellite (DBS system). To meet the criteria of compactness and low cost, microstrip technology is chosen. Two topologies of unitary antenna have been studied, optimized and arrayed to meet the requirements of this project: one coplanar fed monopole antenna and one cross-shape multi resonator antenna. This work has led to numbers of original results. The development of a simple method shows that it is possible to stabilize the radiation pattern in the upper half space over a wide bandwidth and to decrease the rear radiation part. Another contribution of this work lies in the principle of sharing resonators whenarrayingcross shapedantenna. This technique not onlyreduces the inter-element distance (grating lobes appearance), but also, for a given phase gradient, achieves a greater beam steering. This proves the feasibility of such an antenna to be a credible solution.
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Haiyang Zhang. DESIGN AND REALIZATION OF AN AUTO-FOCUS ANTENNA ARRAY FOR SATELLITE COMMUNICATIONS. Engineering Sciences [physics]. UNIVERSITE DE NANTES, 2014. English. ⟨tel-01104808⟩

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