Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns
Low-frequency (<300 MHz) aperture array systems are one of the new trends in modern radio astronomy. Among the challenges they pose, the instrumental calibration is a key aspect requiring an accurate and reliable model of each element of such electrically large array. A full-wave electromagnetic...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2019/9191580 |
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| author | Paola Di Ninni Pietro Bolli Fabio Paonessa Giuseppe Pupillo Giuseppe Virone Stefan J. Wijnholds |
| author_facet | Paola Di Ninni Pietro Bolli Fabio Paonessa Giuseppe Pupillo Giuseppe Virone Stefan J. Wijnholds |
| author_sort | Paola Di Ninni |
| collection | DOAJ |
| description | Low-frequency (<300 MHz) aperture array systems are one of the new trends in modern radio astronomy. Among the challenges they pose, the instrumental calibration is a key aspect requiring an accurate and reliable model of each element of such electrically large array. A full-wave electromagnetic analysis has been carried out for the lower frequency (30–80 MHz) array of the low frequency array (LOFAR) radio telescope taking into account the presence of soil ground, the mutual coupling between the antennas and the relevant receiver impedance loading effects. The impact of mutual coupling effects on the embedded element and array patterns is assessed for two subarray configurations with different degrees of sparseness. A simplistic array factor approach has been implemented as well to determine the accuracy in the antenna pattern evaluation with respect to the full-wave approach. Finally, results from an experimental campaign conducted by means of a micro hexacopter system show the reliability of the developed array numerical model. |
| format | Article |
| id | doaj-art-ce5b1cb9473f44f491d2a9b2ef6f70d8 |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-ce5b1cb9473f44f491d2a9b2ef6f70d82025-02-03T01:23:52ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772019-01-01201910.1155/2019/91915809191580Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation PatternsPaola Di Ninni0Pietro Bolli1Fabio Paonessa2Giuseppe Pupillo3Giuseppe Virone4Stefan J. Wijnholds5Osservatorio Astrofisico di Arcetri, Istituto Nazionale di Astrofisica, Florence 50125, ItalyOsservatorio Astrofisico di Arcetri, Istituto Nazionale di Astrofisica, Florence 50125, ItalyIstituto di Elettronica e di Ingegneria dell’Informazione e delle Telecomunicazioni, Consiglio Nazionale delle Ricerche, Turin 10129, ItalyIstituto di Radioastronomia, Istituto Nazionale di Astrofisica, Bologna 40129, ItalyIstituto di Elettronica e di Ingegneria dell’Informazione e delle Telecomunicazioni, Consiglio Nazionale delle Ricerche, Turin 10129, ItalyNetherlands Institute for Radio Astronomy, Dwingeloo, 7991 PD, NetherlandsLow-frequency (<300 MHz) aperture array systems are one of the new trends in modern radio astronomy. Among the challenges they pose, the instrumental calibration is a key aspect requiring an accurate and reliable model of each element of such electrically large array. A full-wave electromagnetic analysis has been carried out for the lower frequency (30–80 MHz) array of the low frequency array (LOFAR) radio telescope taking into account the presence of soil ground, the mutual coupling between the antennas and the relevant receiver impedance loading effects. The impact of mutual coupling effects on the embedded element and array patterns is assessed for two subarray configurations with different degrees of sparseness. A simplistic array factor approach has been implemented as well to determine the accuracy in the antenna pattern evaluation with respect to the full-wave approach. Finally, results from an experimental campaign conducted by means of a micro hexacopter system show the reliability of the developed array numerical model.http://dx.doi.org/10.1155/2019/9191580 |
| spellingShingle | Paola Di Ninni Pietro Bolli Fabio Paonessa Giuseppe Pupillo Giuseppe Virone Stefan J. Wijnholds Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns International Journal of Antennas and Propagation |
| title | Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns |
| title_full | Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns |
| title_fullStr | Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns |
| title_full_unstemmed | Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns |
| title_short | Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns |
| title_sort | electromagnetic analysis and experimental validation of the lofar radiation patterns |
| url | http://dx.doi.org/10.1155/2019/9191580 |
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