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Analysis of Offset Antennas in Radio Telescopes

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@article{IJASEIT1071,
   author = {Kim Ho Yeap and Chorng Yin Yiam and Koon Chun Lai and Mey Chern Loh and Soo King Lim and Zairi Ismael Rizman},
   title = {Analysis of Offset Antennas in Radio Telescopes},
   journal = {International Journal on Advanced Science, Engineering and Information Technology},
   volume = {6},
   number = {6},
   year = {2016},
   pages = {997--1004},
   keywords = {reflector antennas; Cassegrain offset; Gregorian offset; physical optics; radio telescopes},
   abstract = {We present an analysis on the performance of two popular dual offset antennas design, i.e. the offset Cassegrain and Gregorian reflector antennas. In our study, we have adopted the design parameters for the Cassegrain configuration used in the Atacama Large Milimeter Array (ALMA) project. Modifications on the original parameters are made so as to meet the design requirement of the offset configurations. To reduce spillover loss, we have adjusted the angle between the axis of the primary reflector and that of the sub-reflector to 0.20o. The results obtained from the physical optics computation show that the amplitude at the main lobe of the Gregorian configuration is approximately 74.02 dB, while that of the Cassegrain configuration is approximately 74 dB. The maximum (relative) side lobe level, SLLdB for the Cassegrain and Gregorian configurations are found as -3.67 dB and -3.69 dB respectively. Although the magnitude of the main lobe for both configurations is comparable, the Gregorian antenna gives relatively lower SLLdB. In other words, the Gregorian configuration performs relatively better than its Cassegrainian counterpart.},
   issn = {2088-5334},
   publisher = {INSIGHT - Indonesian Society for Knowledge and Human Development},
   url = {http://ijaseit.insightsociety.org/index.php?option=com_content&view=article&id=9&Itemid=1&article_id=1071},
   doi = {10.18517/ijaseit.6.6.1071}
}

EndNote

%A Yeap, Kim Ho
%A Yiam, Chorng Yin
%A Lai, Koon Chun
%A Loh, Mey Chern
%A Lim, Soo King
%A Rizman, Zairi Ismael
%D 2016
%T Analysis of Offset Antennas in Radio Telescopes
%B 2016
%9 reflector antennas; Cassegrain offset; Gregorian offset; physical optics; radio telescopes
%! Analysis of Offset Antennas in Radio Telescopes
%K reflector antennas; Cassegrain offset; Gregorian offset; physical optics; radio telescopes
%X We present an analysis on the performance of two popular dual offset antennas design, i.e. the offset Cassegrain and Gregorian reflector antennas. In our study, we have adopted the design parameters for the Cassegrain configuration used in the Atacama Large Milimeter Array (ALMA) project. Modifications on the original parameters are made so as to meet the design requirement of the offset configurations. To reduce spillover loss, we have adjusted the angle between the axis of the primary reflector and that of the sub-reflector to 0.20o. The results obtained from the physical optics computation show that the amplitude at the main lobe of the Gregorian configuration is approximately 74.02 dB, while that of the Cassegrain configuration is approximately 74 dB. The maximum (relative) side lobe level, SLLdB for the Cassegrain and Gregorian configurations are found as -3.67 dB and -3.69 dB respectively. Although the magnitude of the main lobe for both configurations is comparable, the Gregorian antenna gives relatively lower SLLdB. In other words, the Gregorian configuration performs relatively better than its Cassegrainian counterpart.
%U http://ijaseit.insightsociety.org/index.php?option=com_content&view=article&id=9&Itemid=1&article_id=1071
%R doi:10.18517/ijaseit.6.6.1071
%J International Journal on Advanced Science, Engineering and Information Technology
%V 6
%N 6
%@ 2088-5334

IEEE

Kim Ho Yeap,Chorng Yin Yiam,Koon Chun Lai,Mey Chern Loh,Soo King Lim and Zairi Ismael Rizman,"Analysis of Offset Antennas in Radio Telescopes," International Journal on Advanced Science, Engineering and Information Technology, vol. 6, no. 6, pp. 997-1004, 2016. [Online]. Available: http://dx.doi.org/10.18517/ijaseit.6.6.1071.

RefMan/ProCite (RIS)

TY  - JOUR
AU  - Yeap, Kim Ho
AU  - Yiam, Chorng Yin
AU  - Lai, Koon Chun
AU  - Loh, Mey Chern
AU  - Lim, Soo King
AU  - Rizman, Zairi Ismael
PY  - 2016
TI  - Analysis of Offset Antennas in Radio Telescopes
JF  - International Journal on Advanced Science, Engineering and Information Technology; Vol. 6 (2016) No. 6
Y2  - 2016
SP  - 997
EP  - 1004
SN  - 2088-5334
PB  - INSIGHT - Indonesian Society for Knowledge and Human Development
KW  - reflector antennas; Cassegrain offset; Gregorian offset; physical optics; radio telescopes
N2  - We present an analysis on the performance of two popular dual offset antennas design, i.e. the offset Cassegrain and Gregorian reflector antennas. In our study, we have adopted the design parameters for the Cassegrain configuration used in the Atacama Large Milimeter Array (ALMA) project. Modifications on the original parameters are made so as to meet the design requirement of the offset configurations. To reduce spillover loss, we have adjusted the angle between the axis of the primary reflector and that of the sub-reflector to 0.20o. The results obtained from the physical optics computation show that the amplitude at the main lobe of the Gregorian configuration is approximately 74.02 dB, while that of the Cassegrain configuration is approximately 74 dB. The maximum (relative) side lobe level, SLLdB for the Cassegrain and Gregorian configurations are found as -3.67 dB and -3.69 dB respectively. Although the magnitude of the main lobe for both configurations is comparable, the Gregorian antenna gives relatively lower SLLdB. In other words, the Gregorian configuration performs relatively better than its Cassegrainian counterpart.
UR  - http://ijaseit.insightsociety.org/index.php?option=com_content&view=article&id=9&Itemid=1&article_id=1071
DO  - 10.18517/ijaseit.6.6.1071

RefWorks

RT Journal Article
ID 1071
A1 Yeap, Kim Ho
A1 Yiam, Chorng Yin
A1 Lai, Koon Chun
A1 Loh, Mey Chern
A1 Lim, Soo King
A1 Rizman, Zairi Ismael
T1 Analysis of Offset Antennas in Radio Telescopes
JF International Journal on Advanced Science, Engineering and Information Technology
VO 6
IS 6
YR 2016
SP 997
OP 1004
SN 2088-5334
PB INSIGHT - Indonesian Society for Knowledge and Human Development
K1 reflector antennas; Cassegrain offset; Gregorian offset; physical optics; radio telescopes
AB We present an analysis on the performance of two popular dual offset antennas design, i.e. the offset Cassegrain and Gregorian reflector antennas. In our study, we have adopted the design parameters for the Cassegrain configuration used in the Atacama Large Milimeter Array (ALMA) project. Modifications on the original parameters are made so as to meet the design requirement of the offset configurations. To reduce spillover loss, we have adjusted the angle between the axis of the primary reflector and that of the sub-reflector to 0.20o. The results obtained from the physical optics computation show that the amplitude at the main lobe of the Gregorian configuration is approximately 74.02 dB, while that of the Cassegrain configuration is approximately 74 dB. The maximum (relative) side lobe level, SLLdB for the Cassegrain and Gregorian configurations are found as -3.67 dB and -3.69 dB respectively. Although the magnitude of the main lobe for both configurations is comparable, the Gregorian antenna gives relatively lower SLLdB. In other words, the Gregorian configuration performs relatively better than its Cassegrainian counterpart.
LK http://ijaseit.insightsociety.org/index.php?option=com_content&view=article&id=9&Itemid=1&article_id=1071
DO  - 10.18517/ijaseit.6.6.1071