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Abstract
A coplanar waveguide (CPW) feed multiband combinational structure antenna with open sleeve structure is proposed. Radiator is combined by three parts in which the first part is fed by central feeder line directly, and the other two parts are fed by electromagnetic coupling through slots. This structure helps broaden the bandwidth in a great extent. Meanwhile, an open sleeve structure is also adopted on the ground to achieve broadband and multiband characteristics. The proposed antenna has a small size of 30 × 24 × 0.8 mm3 and covers a frequency band from 3.28 GHz to 5.85 GHz for return loss less than –10 dB, which is 56.3%. The peak gain of the antenna is 3 dB which appears at 5 GHz.