In this article, the review on ultra-wideband (UBW) filter in wireless communication system is presented. The basic standard of UWB is defined by the federal communication committee (FCC) that the unlicensed frequency band that is 3.1 to 10.6 GHz. This UWB technology is emerging technology that uses very short radio pulse called Gaussian pulse. The advantage of such UWB is high data rate and high speed with low power consumption. In UWB system, transmitter and receiver are used in which in both systems, bandpass / bandstop filter with ultra-wideband bandwidth can be implemented. For this purpose, many researchers are concentrating to get UWB characteristics in filter using various kinds of filter design technologies.