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In this paper we give an overview about the design and qualification of the Medusa feed system. Results of the qualification tests as well as comparisons of predicted and measured performance data are given.
Branch-line couplers are widely used for satellite antennas. In this paper we describe different types of branchline couplers and their use for satellite antennas.
This paper presents the design process as well as the performance and test results achieved for a novel combined transmit (Tx)/receive (Rx) feed chain with RF sensing (RFS) capabilities This modular feed chain is useable for multiple spot beam satellite antennas with overlapping beams in Ka-band. We describe an efficient EM-field/circuit co-optimization technique, which uses the advantages of both,...
Since 2008 the lightweight intersatellitelink antenna (LISAMS) has been developed for establishing communication between low flying satellites (e.g. earth observation satellites) and geostationary relay satellites. For this development a detailed electrical design has been simulated to predict performance parameters. The paper describes the detailed component design and the comparison of the simulated...
Within the framework of the project VERSA, a new approach to beam forming networks is investigated. The aim is to combine structural and electrical functions in one multilayer to gain electrical performance and to save weight. For this purpose a library of standard components for the RF-designer is developed, as well as the fabrication technology to produce these modules reliably and with high yield.
This paper describes the design of a multiple spot beam satellite antenna with overlapping beams in Ka-band. It has been designed in the frame of the DLR granted R&D program ldquoMedusardquo. We discuss the principle of a multiple feeds per beam (MFB) antenna in comparison to a classical single feed per beam (SFB) antenna. Results for the optimisation of antenna and feed network are given.
Future communication satellites equipped with multi spot beam antennas are providing more than 100 adjacent coverages on earth create very high demands for RF measurements during acceptance test campaigns performed prior to the satellites launch. The antennas beam isolation and frequency re-use capability require high measurement accuracies for the related test facility and a high time efficiency...
The request for telecommunication satellites with mixed BSS (Broadcast Satellite Services) and FSS (Fixed Satellite Services) services had been continuously increasing in the recent past. In order to minimize the number of overall antennas on these spacecrafts it is often advantageous to combine both services into a single antenna. Key component of such a satellite antenna is the feed system. Beside...
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