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Recent publications have reported on an innovative technique in which measured antennas are represented as numerical sources in the accurate computation of antennas in complex environments [1-5]. The measured antenna is accurately characterized as a Huygens box in a format compatible with different Computational Electro-Magnetic (CEM) solvers. The numerical representation of the measured antenna is...
This paper describes the challenges of performing accurate antenna measurements at low frequencies (UHF/P-band) and summarizes recent results achieved at ESA-ESTEC on near field testing of several space antennas working at those frequencies. In particular, the paper will present typical uncertainty budgets for medium gain antennas, analyzing the different contributions depending on the test setup...
The measured source or Huygens box antenna representation has become an increasing popular solution to create accurate computational models of measured source antennas for the numerical analysis of antenna placement on complex platforms such as satellites. The equivalent representation of the measured antenna is obtained through the equivalent current (EQC) or inverse source technique, which is a...
The 3D reconstruction algorithm of DIATOOL is applied to the Search and Rescue antennas (SARANT) mounted on the GALILEO satellite, recently measured by the planar near-field scanner of the Hybrid ESA RF and antenna Test Zone (HERTZ) at ESTEC. SARANT operates in L and UHF band, and is one of the many antennas sitting on the GALILEO satellite. The measured field showed a pattern deformation that could...
In this paper data coming from a GNSS satellite measurement campaign will be used to perform an advanced analysis regarding the interaction between antennas, satellite structure and appendages.
Single and double layer frequency selective surfaces (FSS) for Circular polarization (CP) operation were designed. The designed FSS provide reflection in the Ku-band (11.7–12.75 GHz) and transmission in the Ka-band (17.3–20.2 GHz). CP is conserved in each of the bands. For the double layer design over the Ku-band the reflection loss was less than 0.05 dB for TE and TM polarizations while the axial...
This paper describes the practical application of the inverse-source or source-reconstruction technique as a detailed antenna diagnostic tool [1-5]. The investigated antenna is intended as part of the European Navigation System GALILEO and is a pre-development model flying on the InOrbit Validation Element, GIOVE-B satellite. The array antenna, developed by EADS-CASA Espacio, consists of 42 patch...
The field of antenna measurements is lacking a Golden Standard, i.e. an antenna of which the pattern is known by definition. To gain confidence in the performance of a range, including the procedures and skills of the operators, range comparison has been a popular tool for over three decades. In the beginning, ad-hoc available antennas were shipped around the various ranges. Soon it became clear that...
A new design approach and an associated software tool for conical corrugated horn antennas has been developed in a joint TICRA-Thales Alenia Space-ESA project. The software is developed such that it supports the user in designing an optimized horn antenna in a natural way with stepwise refinements both in geometry, in optimization parameters selection and in design requirements definition. The techniques...
Satellite positioning systems, like GPS and Galileo, require ground reference antennas with high quality radiation performance. The use of a radiator integrated with an artificial magnetic conductor (AMC) appears attractive in order to obtain an antenna with low back radiation and good axial ratio performance near the horizon, which is essential for the considered applications. The presented crossed-dipole...
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