A T-Section Dual-Band Matching Network for Frequency-Dependent Complex Loads Incorporating Coupled Line With Dc-Block Property Suitable for Dual-Band Transistor Amplifiers

This paper reports design of a new dual-band T-type impedance transformer also exhibiting DC-blocking feature. The design aims at achieving matching for frequency-dependent complex loads having distinct values at two arbitrary frequencies to Zs (here, 50›). A step-wise analysis on the developed dual-band impedance transformer provides simple closed-form design equations. The design is verifled by simulation in Agilent ADS. For experimental veriflcation a PCB prototype is fabricated using FR-4 material, operating at 1.45GHz and 2.61GHz. A good result is obtained conflrming the theory and simulation.