Abstract-In this paper, a novel monopole printed fork-shaped antenna for ultra-wideband (UWB) applications with triple band-notched characteristics is presented. The proposed antenna, with compact size of 42 × 24 × 1.6 mm 3 , yields an impedance bandwidth of 3.1-11 GHz for S 11 < −10 dB, except on the notched bands which are obtained by introducing three different types of slots. A U-shaped and two extended U-shaped defected ground structure (DGS) slots give respectively two notched bands, 3.3 to 3.7 GHz for WiMAX and 7.1 to 7.76 GHz for downlink X-band satellite communication systems. Therefore, a semi arc-shaped slot is etched on the radiating patch to notch the band from 5.15 to 5.825 GHz for WLAN applications. The proposed antenna is fabricated and measured.

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In this paper, we present a modified UWB antenna with hexagonal slotted ground plane inspired with a double combined symmetric T-shaped slots and dual rotated L-shaped strip for dual band notched characteristics. Initially, the operating frequency range is from 3GHz to 12 GHz. To eliminate the unwanted C-band (3.625-4.2GHz) and the entire uplink and downlink of X-band satellite communication systems (7.25 -8.39 GHz) frequency bands, we are investigating the conventional UWB patch antenna and loaded it with a mentioned strips and slots respectively. The performances of the antenna are optimized both by CST Microwave Studio and Ansoft HFSS. To further analyze the parametric effects of the slots and strips, the surface current distribution is presented and discussed. The antenna gain versus frequency gives an acceptable value except the notched band regions, these values are   reduced from its normal  to be  a negative in  the notched bands (3.625-4.2GHz) and (7.25 to 8.39 GHz).

This paper  presents a  regular hexagonal antenna for ultra wide bandwidth (UWB). Then this antenna is modified to obtain  a dual band with single band notched.The Bluetooth band is integrated in ultrawideband (UWB)  when   the antenna  is loaded by  pair of  inverted 𝛤-shaped strips.To avoid interference with the uwb systems , the wireless local area network of  5.72–5.825 GHz (IEEE 802.11a)  is notched by incorporating a complementary split ring resonator (SRR) slot  within the hexagonal  shaped  . The operating frequency ranges of the proposed antenna are 2.22 GHz - 2.52 GHz  and 3.5 GHz - 10 GHz, which covers Bluetooth (2.4 GHz - 2.484 GHz) and UWB (3.1 GHz - 10.6 GHz) band, besides the range of  Wlan (5.72 GHz - 5.825 GHz)  with return loss more  than 10 dB. The performance of the antenna is simulated and optimized by CST Microwave Studio and validated against using Ansoft HFSS . Surface current distributions is used to analyze the effects of the slot and strips.  The antenna shows  an acceptable gain over both Bluetooth and UWB bands. In the band notched regions, the gain reduces from its normal value to about 4 dBi at 5.75GHz.