%0 Journal Article %T Compact Elliptically Tapered Slot Antenna with Non-uniform Corrugations for Ultra-wideband Applications %A F. G. Zhu %A S. Gao %J Radioengineering %D 2013 %I Spolecnost pro radioelektronicke inzenyrstvi %X A small size elliptically tapered slot antenna (ETSA) fed by coplanar waveguide (CPW) for ultra-wideband (UWB) applications is proposed. It is printed on an FR4 substrate and occupies a size of 37กม34กม0.8 mm3. A pair of quarter circular shapes is etched on the radiator to reduce the size. To overcome the limitation of uniform corrugation, non-uniform corrugation is utilized to reduce the cross-polarization level. A parametric study is carried out to investigate the effects of circular cut and corrugations. In order to validate the design, a prototype is fabricated and measured. Both simulated and measured results confirm that the proposed antenna achieves a good performance of a reflection coefficient below -10 dB from 3.1 GHz to 10.6 GHz, including a maximum antenna gain of 8.1dBi, directional patterns in the end-fire direction, low cross-polarization level below -20 dB and linear phase response. The antenna is promising for applications in UWB impulse radar imaging. %K UWB impulse radar %K UWB imaging %K tapered slot antenna %K UWB antenna %K cross-polarization %U www.radioeng.cz/fulltexts/2013/13_01_0276_0280.pdf