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Tobia Carozzi23/11/2026, 13:20
I will talk about the matrix that is between an electric field of an antenna and the voltage it induces on the antenna back-end. It is commonly known in radio astronomy as the E-jones matrix, but in fact it is not a Jones matrix since it has dimension length. I connect the E-jones in radio observations to effective length of antenna theory. I also extend the embedded element pattern to the...
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Michel Arts23/11/2026, 13:45
In this presentation I will show how the embedded element patterns of the LOFAR Low-band antenna are modeled in Altair FEKO. I will also show how the embedded element patterns can be recalculated for another LNA-impedance without the need to redo the electromagnetic simulation. Furthermore, I will show how spherical wave expansion can be used to describe the embedded element patterns.
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Quentin Gueuning23/11/2026, 14:10
Array mutual coupling is increasingly recognised as a major challenge for accurate beam modelling and calibration in low-frequency radio telescopes. In this talk, I will present the evolution of computational electromagnetics developments at the University of Cambridge, from early in-house tools to the Fast Array Simulation Tool (FAST). Drawing on experience with large-N radio telescopes, I...
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Pietro Bolli23/11/2026, 14:35
Recently, new HBA simulations were conducted based on an EM model of the High Band Antenna developed by Michel Arts. In this analysis, more tiles have been included to account for mutual coupling among antennas. Although the results are very preliminary, sharing them with the community will be useful to determine the best approach for future, more structured simulations. Furthermore, I will...
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Morteza Pashapour-Ahmadabadi23/11/2026, 15:30
Accurate primary beam models are essential for high-fidelity calibration and imaging in modern radio astronomy, but existing approaches either lack the flexibility to capture realistic antenna patterns (analytical models) or become computationally expensive for wide-band observations (electromagnetic simulations, holographic measurements). We present the Generative Antenna Model from Bayesian...
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Olaf Scholten23/11/2026, 15:55
It is shown what can be learned about the antenna functions of LBA and HBA antennas from TBB-data as used in lightning studies. The measurement of the background is measuring the relative total gains of all Dutch LOFAR stations as well as their frequency dependence. The lightning pulses measure timing and variations in the incident angle dependence of the gain. This is done for LBA and HBA antennas.
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Cees Bassa23/11/2026, 16:20
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Caterina Tiburzi (INAF-OAC)23/11/2026, 16:45
dreamBeam is used in the first attempt at polarization calibrating pulsar data collected with the international HBA stations. The results show that a standard pulsar calibration approach fails, due to the inaccurate corrections of the projection effects by dreamBeam. We propose this procedure as a test bench test for the new beam model proposed for LOFAR2.0
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Sjoerd Bouma24/11/2026, 09:00
This talk will give a brief overview of the work done by the cosmic-ray key science project (CR-KSP) to calibrate the combined antenna and signal chain response of the LBA antennas. It will cover both the findings as well as the obstacles encountered in two different approaches to the calibration problem, one that combines antenna simulations with a dedicated measurement of the LNA, and...
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Mick Veldhuis (ASTRON)24/11/2026, 09:25
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Shane O'Sullivan (Universidad Complutense de Madrid)24/11/2026, 09:50
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