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A rectangular loop antenna for S-band radar is proposed. The proposed loop antenna is the modified type of folded monopole antenna. The feeding line is coplanar stripline with 180˚ phase difference for operating in odd mode. The proposed antenna showed return loss of -15.57dB at the center frequency and bandwidth of about 790MHz (>25%) under the condition of VSWR<2. The gains of single, 1×2, and 1×4 array loop antennas are 4.3, 7.0, and 10.2dBi, respectively.