Design of Modified Hexagonal UWB Slot Antenna with Dual Band Notched Characteristics

Printed modified hexagonal slot ultra-wideband micro strip-fed antenna with dual band rejection characteristics is presented. The antenna comprises U-shape radiating patch on one side of substrate and ground plane with modified hexagonal slot on other side of substrate with compact size of 28 x 28 mm(2). By inserting symmetrical L-form parasitic ends at the upper edge at the modified hexagonal slot and C-shape parasitic stubs at the both arms of the patch to obtain the desired stop band characteristics for WiMAX and WLAN respectively. The designed antenna is operate in between 3.02 similar to 15GHz with a dual stop band from 3.15 similar to 4.06GHz (for Worldwide Interoperability for Microwave Access) and 5.13 similar to 6.2GHz (for Wireless Local Area Network). To mitigate the possible interference in between UWB and these narrow bands (Worldwide Interoperability for Microwave Access and Wireless Local Area Networkbands) will help. The designed antenna is made-up on a FR-4 glass epoxy substrate having dielectric constant of 4.4. Parametric studies have been conducted by changing length L-2 (symmetrical L-shape stubs) and L-3(C-shape stubs) and it is directedwith the help of FEKO-EM simulation software. Performance of this antenna studied in terms of VSWR, efficiency, radiation pattern, time domain analysis. Forthe total ultra-wideband excluding for Worldwide Interoperability for Microwave Access and Wireless Local Area Network frequency, Proposed antenna shows efficiency more than 75%.