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.