Bandwidth Enhancement of Small Square Monopole Antenna with Dual Band Notch Characteristics Using U-Shaped Slot and Butterfly Shape Parasitic Element on Backplane for UWB Applications
Keywords:
Dual band notch, monopole antenna, parasitic element, Ultra-Wideband (UWB), U-shaped slotAbstract
In this study, a dual band notch microstrip antenna for UWB applications has been presented. The antenna consists of a stepped patch with U-shaped slot, two rectangular shaped slots in the ground plane and a butterfly shaped parasitic backplane element structure. By inserting two rectangular shaped slots in the ground plane, much wider impedance bandwidth can be produced. This modification significantly improves the antenna’s impedance bandwidth by 155% which covers the entire UWB bandwidth range and even more. In order to generate single band notch characteristic, a butterfly shaped conductor backplane structure is utilized on the ground plane side of the substrate. In addition, by cutting a U-shaped slot on the radiating patch, a dual band notch function is achieved. The measured frequency results show an impedance bandwidth of 2.35-13 GHz for a Voltage Standing Wave Ratio (VSWR) less than 2 with two eliminated bands placed at 3.25-3.85 GHz and 4.9-6.2 GHz, which reject the Wireless Local Area Network (WLAN) band, WiMAX band, and a major part of the C-band. The measured E-plane and H-plane radiation patterns show a very good correlation with the requirements of UWB applications.
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References
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