an improved cpw-fed printed uwb antenna with controllable bandnotched 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.