A single-feed circularly polarized microstrip antenna array, operating at 2.45 GHz, have been analyzed and designed. The antenna is mainly intended to be used for reception of a video signal transmitted from an unmanned aircraft, but can be used for other applications as well. Due to the fact that it is supposed to be used in a switched system, the beam width is quite narrow. Measurements of the antenna shows that it have a half power beam width of 40 degrees. For a VSWR lower than 1.5 and an axial ratio lower than 3 dB the band width is 80 MHz centered at 2.44 GHz. The side lobe levels are lower than -23 dB.
The antenna is designed to be simple in layout due to the fact that it should be as robust as possible against manufacturing faults.
Author: Lagerqvist, Johan
Source: Luleå University of Technology
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