Broadband rectangular patch microstrip antenna with rhombus shaped slot for WLAN applications

The paper presents best matching between simulated and measured results of broadband Rectangular Patch Microstrip Antenna with Rhombus Shaped Slot (RPMARSS) for the WLAN 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 of this antenna are optimized by varying position, length and width of the Rhombus shaped slot. The simulated and measured results indicate that the designed structure resonate at various closely spaced frequencies which lying between frequency band allocation for WLAN application [WLAN (Wireless Local Area Network) has been allocated (IEEE 802.11a5) frequency band, (5.15 to 5.825 GHz)] and offers much improved simulated bandwidth 16.09% at central resonance frequency 5.66GHz and measured bandwidth is 15.06% at central frequency 5.51GHz, This is five times higher than that in a conventional rectangular patch antenna (Bandwidth = 3%) with same dimensions.