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This article proposes a novel 4-sector cylindrical- rectangular microstrip array with high-gain operation and multi-beam radiation for IEEE 802.11j MIMO WLAN system. With the use of 1£2 array, the impedance bandwidth for the operating band of 5GHz can reach about 2.5% (125MHz), which is enough for IEEE 802.11j speciflcations. Peak antenna gains across the operating band are close to 11.0dBi with the gain variations of 0.3dBi.

CYLINDRICAL-RECTANGULAR MICROSTRIP ARRAY WITH HIGH-GAIN OPERATION FOR IEEE 802.11J MIMO APPLICATIONS