Design of a Microstrip Fed Printed Monopole Antenna for Bluetooth and UWB Applications with WLAN Notch Band Characteristics

In this article, a microstrip fed printed dual band antenna for Bluetooth (2.4-2.484 GHz) and ultra-wide band (UWB; 3.1-10.6 GHz) applications with wireless local area network (WLAN; 5.15-5.825 GHZ) band-notch characteristics is proposed. The desired dual band characteristic is obtained by using a spanner shape monopole with rectangular strip radiating patch, whereas the band-notch characteristics is created by a mushroom-like structure. The Bluetooth and notch bands can easily be controlled by the geometric parameters of the rectangular strip and mushroom structure, respectively. The proposed antenna has been designed, fabricated, and tested. It is found that the proposed antenna yields both the Bluetooth and UWB performance in the frequency regions of 2.438 to 2.495 GHz and 3.10 to 10.66 GHz, respectively for vertical bar S-11 vertical bar <=-210 dB with an excellent rejection band of 5.14 to 5.823 GHz to prevent WLAN signals. The experimental results provide good agreement with simulated ones. Surface current distributions are used to analyze the effects of the rectangular strip and mushroom. The designed antenna exhibits nearly omnidirectional radiation patterns, stable gain along with almost constant group delay over the desired bands. Hence, the proposed antenna is expected to be suitable for both Bluetooth and UWB applications removing the WLAN band. (C) 2014 Wiley Periodicals, Inc.