Comparison of Geometrical and Physical Optics for Cross-Polarisation Prediction in Reflector Antennas

2017 ◽  
Author(s):  
S. Mercader-Pellicer ◽  
G.M. Medero ◽  
G. Goussetis
Keyword(s):  
Physical Optics ◽  
Reflector Antennas

A physical optics based near-field analysis method for the design of dual polarized fan beam shaped reflector antennas

2016 ◽  
Vol 70 (2) ◽  
pp. 132-137 ◽  
Author(s):  
E. Bagheri-Korani ◽  
K. Mohammadpour-Aghdam ◽  
M. Ahmadi-Boroujeni ◽  
E. Arbabi ◽  
M. Nemati
Keyword(s):  
Near Field ◽  
Field Analysis ◽  
Physical Optics ◽  
Analysis Method ◽  
Reflector Antennas ◽  
Dual Polarized

scholarly journals Optimization of reflector antennas in radio telescopes

2017 ◽  
Vol 13 (3) ◽  
Author(s):  
Kim Ho Yeap ◽  
Koon Chun Lai ◽  
Kung Chuang Ting ◽  
Peh Chiong Teh ◽  
Humaira Nisar ◽  
...  
Keyword(s):  
Focal Length ◽  
Diameter Ratio ◽  
Signal Frequency ◽  
Design Parameters ◽  
Physical Optics ◽  
Radio Telescopes ◽  
Reflector Antennas ◽  
Radiation Characteristics ◽  
Optimum Performance ◽  
Aperture Efficiency

We present an analysis on the performance of Cassegrain reflector antennas. In our study, we have adopted the design parameters for the Cassegrain configuration used in the Atacama Large Millimeter Array (ALMA) project. We have adjusted the focal-length-to-diameter ratio f/D of the primary reflector to investigate the optimum performance of the antenna. In our study, signal frequency at the high edge of ALMA band 1, i.e. 45 GHz has been selected. The results obtained from the physical optics simulation show that the aperture efficiency of the antenna is at its optimum (i.e. 80.36%) when f/D ranges from 0.5 to 0.6. The radiation characteristics at this range of ratio are found to be similar. The radius of the secondary reflector and edge taper Te which correspond to the optimum aperture efficiencies ranges from 371 mm to 372 mm and 10.64 dB to 10.75 dB, respectively.

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