Compact size dual-polarized WLL base-station antenna using aperture coupled microstrip patches

The commercialization of the WLL (wireless local loop) system has been accelerated in many countries with the expansion of wireless technology. In most cases, a dipole array antenna or corporate feed microstrip array antenna is used for WLL base-stations. They are quite large, bulky, and heavy. In this paper, a compact size dual-polarized WLL base-station array antenna using aperture coupled microstrip patches connected with a series traveling-wave feed line is proposed. It meets the requirements of the WLL base-station antenna, its size is about 150/spl times/700/spl times/80 mm (compact design), and its measured isolation between the two ports is approximately 40 dB for the WLL frequency range of 2.3 GHz-2.4 GHz. In addition, the SLL (side lobe level) of the designed 1 W Chebyshev array antenna is about 20 dB (greater than the typical requirement of 15 dB).