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Coupling reduction of two planar monopole antennas for modern wireless applications

This paper presents a mutual reduction technique based on the insertion of two strips between two adjacent planar monopole rectangular patch antennas with an edge to edge separation of λo/31. The array achieves a total realized gain of 3.73, 4.39 and 3.84 dB at 1.85, 2.4, and 3.5 GHz respectively, a relative bandwidth of 69% (1.8 - 3.7) GHz over which the matching level |S11| is less than -10 dB and the coupling level |S21| is below or equal to -20 dB. The performance offered by the proposed design represents a good candidate to be implemented in modern wireless standards including 3GPP LTE, WiMAX, and IEEE 802.11 WLAN and systems utilizing the ISM band.