Tri-band-notched ultrawideband (UWB) antenna using split semicircular resonator (SSR) and capacitively loaded loops (CLL)

A compact printed ultra-wideband (UWB) monopole antenna with triple band-notched characteristics is presented. The first rejected band (3.3-3.6 GHz) for the WiMAX system is achieved by etching a split semicircular resonator (SSR) on the radiating element. Meanwhile, by adding two capacitively loaded loops(CLLs) close to the micro-strip feed line, the other two band-notched properties in the lower WLAN (5.15-5.35 GHz) and higher WLAN (5.725-5.825 GHz) bands are obtained. The size of antenna is 34 × 27 mm². The measured results are roughly consistent with the simulated. The time domain characteristics are also analyzed. The results show that the proposed antenna has broadband matched impedance characteristics, stable radiation patterns, compressed notched-band gain as well as high time domain fidelity.