A novel design of 1 Ã?â?? 2 and 2 Ã?â?? 2 circularly polarized (CP) microstrip patch antenna arrays is presented in this paper. The two CP\nantenna arrays are fed by sequentially rotated coplanar waveguide (CPW) to slotline networks and are processed on 1mm thick\nsingle-layer FR4 substrates. Both of the two arrays are low-profile and lightweight. An air-bridge free CPW-slotline power splitter is\nappropriately designed to formthe feeding networks and realize the two CP antenna arrays.Themechanism of circular polarization\nin this design is explained. The simulated and measured impedance bandwidths as well as the 3 dB axial ratio bandwidths and the\nradiation patterns of the two proposed antenna arrays are presented.This proposed design can be easily extended to form a larger\nplane array with good performance owing to its simple structure.
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