A microstrip-fed crossed-slot array antenna having a circular polarisation is developed. First, a single crossed-slot antenna, that can radiate a circularly polarised wave in the broadside direction, is designed and its coupling level to the microstrip line is analysed. Based on this result, an eight-element crossed-slot array is designed and its characteristics are experimentally investigated at 12 GHz band. The return loss of −17 dB is obtained at the design frequency of 11.85 GHz, and the axial ratio of less than 3 dB is achieved over the fractional bandwidth of 5%.
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Hirano, T., Hirokawa, J., Ando, M.: `Design of a waveguide crossed-slot array with matching elements using the method of moments with numerical-eigenmode basis functions', IEEE Antennas Propagation Society Symp., 2003, Columbus, OH, USA, AP Session 121.5.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_20040196
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