In this paper, a novel two-section dual-band impedance transformer with embeded spurline sections is proposed. With this new structure, the intrinsic spurious matchings at the 3rd an 5th harmonic freguency bands can be significantly suppressed, whilst the matching at the two designed operating frequencies can be maintained. In order to demonstrate the proposed transformer performance, a GSM dual-band (900 MHz and 1.8 GHz) impedance transformer was designated and implemented. From the simulation and experimental results, the proposed transformer maintains the good matching of 35 dB at the dual GSM freguency bands and suppresses all unwanted matching upto its 5th harmonic band.