Abstract
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.
Highlights
In recent years, UWB systems become very attractive since the Federal Communications Commission (FCC) released the frequency band from 3.1 GHz to 10.6 GHz to be an unlicenced band with a good effective radiated power spectral density of -41.3 dBm/MHz [1]
As the top side of the antenna loaded by a pair of Shaped (Ant II), the Bluetooth band is integrated into UWB antenna with good impedance matching (Trace II)
To stop wireless local area network (WLAN) band (Ant III).The hexagonal shaped is incorporated by a complementary split ring resonator (CSRR) slot (Trace III)
Summary
UWB systems become very attractive since the Federal Communications Commission (FCC) released the frequency band from 3.1 GHz to 10.6 GHz to be an unlicenced band with a good effective radiated power spectral density of -41.3 dBm/MHz [1]. Besides UWB and Bluetooth are some applications that take advantage of license-free frequency of operation in the Industrial, Scientific, and Medical (ISM) band covering the 2.40–2.484-GHz band To integrate these bands for use in one device, it ‘s essential to develop a dual band [7,8]. Various approaches have been observed in the literature [12] in order to achieve single and dual band notches such as U-Shaped Slot and W-Shaped Slot [13], C-Shaped Slots [14] elliptical slot uwb antenna with half circular ring radiator element [15].The band stop frequency can be controlled by adjusting the length or radius of the hexagonal design. This letter contributes towards obtaining tri-band antenna with wide bandwidth without increasing their size and to design simple-structured, low profile, omnidirectional structure with an acceptable gain
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