NOVEL Pi-TYPE STEPPED-IMPEDANCE-STUB BRANCH LINE AND ITS APPLICATION TO DUAL-BAND POWER DIVIDER WITH HIGH SUPPRESSION OF INTERMEDIATE FREQUENCIES

摘要

A novel Pi-type branch line is constructed by using two shunt stepped-impedance stubs in this paper. Introducing the stepped-impedance stubs increases design degrees of freedom of this Pi-type line. This structure can be used to replace arbitrary single-section transmission line in microwave components. Meanwhile, by selecting proper parameters according to the given analytical theory, arbitrary dual-band operations can be realized. To verify the feature of this proposed structure, a dual-band (1.1 and 1.65 GHz) 3-dB Wilkinson power divider with measured 50-dB suppression at the mid band of 1.45 GHz is presented. Finally, experimental results verify the theoretical analysis.