Compact integrated bluetooth UWB bandnotch antenna for personal wireless communication

In this paper, a compact microstrip fed octagonal ring dual band antenna for integrated Bluetooth (2.4∼2.484 GHz) and ultra-wideband (UWB; 3.1∼10.6 GHz) applications withband notch characteristics for wireless local area network (WLAN; 5.15∼5.825 GHz) is proposed and investigated. The entire UWB frequency band is achieved by using an octagonal ring patch and a modified ground plane. The dual band operation is achieved by integrating Bluetooth characteristicsby embedding a quarter wavelength resonating strip at the center of the octagonal ring radiating patch. Further, to avoid the potential interferences of the UWB system with the existing narrow band system such as WLAN in the proposed antenna,an inverted U-shaped slot in the feed line has been etched to obtain the desired band notch characteristics. The proposed antenna is designed, fabricated on a FR4 glass epoxy substrate and tested. The proposed antenna yields a measured impedance bandwidth over the frequency range of 2.40 ∼ 2.5 GHz and 3.1 ∼ 13 GHz to exhibit the integrated Bluetooth and UWB characteristics respectively for VSWR < 2 with an excellent rejection band of 5.15 ∼ 5.90 GHz to prevent interferences of WLAN signals. The proposed antenna exhibits directional and omnidirectional radiation pattern in E and H-plane with stable gain and good time domain characteristics at all desired frequency bands. The compact dimension of 38 × 30 mm2 of the proposed antenna makes it a suitable candidate for personal wireless communication application. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:540–546, 2016