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Ultra wide-band (UWB) radar imaging systems are a promising field of research as they cover a variety of applications. Among all UWB radar imaging methods, the time-reversal (TR) method enables high-resolution imaging in a multi path environment. Conventional TR methods have been applied to antenna array systems while our previous work proposed a type of TR method, namely the frequency-domain Decomposition de Operateur de Retournement Temporel (DORT) method, designed for a low-cost single antenna based system. Because the frequency-domain DORT method was developed assuming a point-like target, the performance of the method for a finite-sized target is unknown. In this study, we investigate numerically the performance of the frequency-domain DORT method by applying it to finite sized targets and evaluating the quality of the resultant images.