Dual band and Broadband Rectangular Patch Mircostrip Antenna with T Shaped Slot for WiMax Application

–The paper presents the good matching between simulated and measured results of dual band and broad band rectangular patch mircostrip antenna with T shaped slot (RPMATSS) for the WiMax Application. This antenna is designed on glass epoxy FR-4 substrate. The performance of this antenna is also compared with that of a simple rectangular patch antenna. The simulated results for this antenna are optimized by varying position, length and width of T shaped slot. The Simulated and measured results indicate that the designed structure resonate at various closely spaced frequencies which lying between two different frequency bands (median and higher) allocation for WiMax application [WiMAX (Worldwide Interoperability for Microwave Access) has been allocated (IEEE 802.16) frequency bands, which will be called the median band (3.25 to 3.85 GHz) and the high band (5.25 to 5.85 GHz), respectively] and offers much improved bandwidth 8.9% at central resonance frequency 3.55GHz and 12.53% at central resonance frequency 5.84GHz in comparison to an rectangular patch antenna (having band width 3.27%). The directivity and gain of antenna also improves significantly at some of the resonance frequencies. Keywords––Microstrip antenna, dual band, broadband, impedance bandwidth, gain.