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A Coplanar Waveguide-fed Ultra Wideband Hexagonal Slot Antenna with WLAN Band Rejection


Tapan Mandal 1,  Santanu Das 2

1 Department of Information Technology, Government College of Engineering and Textile Technology, Serampore, Hooghly, India
2 Department of Electronics & Tele-Comm. Engineering,
Bengal Engineering and Science University, Shibpur, Howrah, India


The paper is received June 15, 2013  


Abstract. In this paper a printed regular hexagonal slot antenna with a hexagonal stub fed by a CPW line has been considered for UWB. This antenna is then modified to obtain band rejection for WLAN of 5.15-5.88 GHz by incorporating a C-shape slot within the exciting stub. The parameters of the C-shape slot offer sufficient freedom for selecting and shifting the notch band. VSWR, gain and radiation characteristics of them are studied and discussed here. From the experimental results it has been observed that the impedance bandwidth, defined by VSWR ≤ 2, reaches a value of 7.35GHz (3.05~10.4GHz), with stop band between 5.10 to 6.0 GHz. The antenna gain varies from 4 dB to 6 dB over the whole operating band excluding the notch band. Surface current distributions and transmission line model are used to analyze the effects of the slot. Measured group delay has small variation within the operating band except notch band and hence the proposed antenna may be suitable for UWB applications.  

Keywords: CPW, C-slot, hexagonal slot, hexagonal stub, WLAN band, UWB.