Tri-band matching technique based on characteristic impedance transformers for concurrent tri-band power amplifiers design

This paper introduces a novel matching network synthesis method that matches arbitrary impedance at three independed frequencies to 50 Ohm. By converting impedance matching to admittance matching, the matching work can be divided into two steps. Modified T-type topology for triple band admittance matching is discussed based on ABCD-parameters, and the formulas of matching networks are analytically derived. Finally, the proposed synthesis approach is validated with the design and simulation of a tri-band matching network at 900, 1900 and 2400 MHz.