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A 60-GHz wideband circular polarized (CP) patch array of 4Ã4 elements is designed and fabricated in low temperature cofired ceramic (LTCC) technology. By applying a strip line sequential rotation feeding scheme this array exhibits wide impedance bandwidth (VSWR<2) and 3-dB axial ratio (AR) bandwidth, both over 8 GHz. In addition, it exhibits a peak gain of 16.8 dBi and a beam-shaped pattern with a 3-dB beam width of 20Â°. With a grounded co-planar waveguide (GCPW) to strip line (SL) transition added to facilitate the testing, the array performance is not degraded except of a 0.6-dB peak gain penalty. The fabricated antenna sample measures 13Ã18.7Ã1.4 mm3. The wireless test is finally conducted to demonstrate the CP characteristic and wide impedance bandwidth over 8 GHz (VSWR<2) of this antenna.