An Improved CPW-Fed Printed UWB Antenna With Controllable Band-notched Functions

A newly designed printed slot antenna is presented that incorporates variable two band-notched functions for ultra-wideband (UWB) applications. The two band notches of this coplanar waveguide (CPW) fed antenna are achieved by an M-shaped slot (MSS) embedded in the radiating element and a C-shaped strip (CSS) close to ground plane, therefore two very narrow rejected properties in the wireless local area network (WLAN) band (5.15-5.825 GHz) and worldwide interoperability for microwave access (WiMAX) operation in the (3.3-3.7GHz) are obtained. The rectangular aperture is etched in the square ground plane. It has a determinative role in antenna’s impedance bandwidth (IBW) enhancement; moreover, by adjusting carefully it leads to wide IBW. Based on simulated results it covers the frequency range 2.4–12.9 GHz with VSWR ≤ 2, which corresponds to a fractional bandwidth of 137% excluding the rejected bands. Numerical and measured results are presented to understand its behavior. The volume of the proposed antenna is 25 × 25 × 0.8 mm3.