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At present, the advance of wireless systems require an increasment in bandwidth and sharing in limited frequency bands, particularly in PDC (Personal Digital Cellular telecommunication system), PHS (Personal Handy-phone System), IMT-2000 (International Mobile Telecommunication-2000), and WLAN (Wireless Local Area Network). The popular antennas for WLAN access point are linear dipole, slot array and microstrip antenna. These antennas will be usually placed at the wall of rooms or buildings. This paper presents a 1?4 array antenna using asymmetric T-shaped slit loaded MicroStrip Antenna (MSA). The antenna consists of four MSAs align vertically on a dielectric substrate and ground plane. This antenna will be utilized in WLAN applications as the commercial panel antenna. A modified array configuration is proposed to further enhance the antenna radiation characteristics and usable bandwidth.
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