Abstract
A Coplanar Waveguide (CPW) fed miniaturized ultra-wideband (UWB) tri-notch antenna with bandwidth enhancement is proposed. The antenna is prototyped for ultra-wideband (UWB) communication applications with bandwidth enhancement. By implementing asymmetric structure, the miniaturization in the antenna has been achieved with a very compact size of 22 × 13 × 1.5 mm3 making it suitable for USB dongle applications. The antenna is first simulated with partial rectangular ground plane which shows that operating bandwidth ranges from 3.1 to 10.6 GHz. Then the antenna is measured and simulated by cutting the ground plane with specific geometry which shows that operating bandwidth now ranges from 3.1 to 20 GHz which provides a wide usable fractional bandwidth of more than 150%. The antenna is then modified for tri-notch applications in order to reject worldwide interoperability for microwave access (WiMAX) band (3.3–3.6 GHz) and wireless local area network (WLAN) frequency bands (lower WLAN (5.15–5.325) and upper WLAN (5.725–5.825) GHz). Triple Band rejection capability has been achieved by introducing three complementary split ring resonators (CSRR) in the radiating patch.
Highlights
Coplanar Waveguide (CPW) fed monopole antennas have been extensively used for the design of wireless ultrawideband (UWB) communication systems due to their specific advantages of low cost, simple structure, and omnidirectional radiation pattern
As 3.3–3.6 GHz frequency band has been allocated for worldwide interoperability for microwave access (WiMAX) and 5-6 GHz frequency band has been reserved for wireless local area network (WLAN)
The WLAN further comprises two narrow frequency bands including lower WLAN (5.150– 5.350 GHz) and upper WLAN (5.725–5.825 GHz). These high power narrow frequency bands within the UWB spectrum generate a jamming effect on UWB systems because of electromagnetic interference which can be mitigated by designing UWB antenna that has multiple band rejection capabilities
Summary
Coplanar Waveguide (CPW) fed monopole antennas have been extensively used for the design of wireless ultrawideband (UWB) communication systems due to their specific advantages of low cost, simple structure, and omnidirectional radiation pattern. The designed antenna operates from 2.2 GHz to 13.4 GHz having two notched bands at WiMAX and WLAN frequency bands. The designed antenna operates from 3.06 GHz to 18.3 GHz. In [8] bandwidth enhancement is up to 140% without removing high power interfering bands in UWB. We firstly present a miniaturized reference UWB antenna operating from 3.1 to 10.6 GHz. the antenna is measured and simulated by cutting the ground plane with specific geometry which shows that operating bandwidth ranges from 3.1 to 20 GHz with a wide usable fractional bandwidth of 150%. UWB frequency band from 3.1 to 10.6 GHz with bandwidth enhancement which ranges from 10.6 GHz to 20 GHz. a proposed miniaturized UWB antenna with triple band rejection capabilities is successfully designed by introducing three complementary split rings resonators (CSRR) in the radiating patch.
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