P. Ritosa and T. Korosec
Wireless networks, WiMAX subscriber antennas, multi sector antennas, antenna diversity, antenna arrays
In this paper, research and realization of prototype antennas for WiMAX system are presented. Realization consists of two versions of low-cost multi-sector antennas for 2.6 GHz and 3.45 GHz frequency bands. Both antennas consist of four sectors, based on patch antenna radiators. The prototype antenna is designed to provide the highest possible gain for required antenna-size limitations. The radiation beam is electronically steerable to provide reception/transmission diversity. Each sector radiator includes two circular microstrip patches stacked vertically. The microstrip patches are punched out of metal sheet and use air as the dielectric. A solid-state microwave switch is used to select one of the four sectors. Such a structure assures 360° horizontal signal coverage with about 10–12 dBi of gain. The antenna design and measured characteristics are presented.
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