Traditionally, the metamaterial (MTM) lines have been synthesised by periodically loading a host transmission line (TL) with series capacitors and shunt inductors [1]. They support a backwardwave fundamental harmonic and hence a negative index of refraction when arranged in the form of two-dimensional or three-dimensional grids [1]. These lines have been employed to build compact wideband phase shifters, filters and other electromagnetic devices [2]. In this Letter, we propose a metamaterial-based bandpass filter that is obtained by loading the traditional MTM lines with an additional shunt capacitor. This extra capacitive loading provides more freedom in controlling the cutoff frequency of the fundamental mode and the subsequent stopband. Furthermore, varactors can be employed to tune the amplitude and phase response of the resulting bandpass filter. in this article, A bandpass filter is constructed by loading a left-handed metamaterial transmission line with an additional shunt capacitor. The shunt capacitor provides more freedom to control the passband characteristics of the resulting metamaterial line. A bandpass filter is designed with a centre frequency that is tunable from 0.45 to 0.65 GHz.