Jeongnam Cheon

Advanced impedance matching technology to optimize RF circuit design of practical wireless systems

In this paper, the novel impedance matching method using multiport network analysis and the particle swarm optimization (PSO) algorithm is proposed. To evaluate the accuracy and reliability of the proposed method, the real handset model is employed, and the target impedance matching is conducted. Good impedance matching results are obtained in the long term evolution (LTE) band8. The calculated results are in excellent agreement with target impedance, under the relative voltage standing wave ratio (RVSWR) of 1.5. Compared with the reference model, measured output power (Pout), adjacent current power ratio (ACPR), and current consumption of the power-amp module (/pam) have errors within 0.5dBm, 3dBc, and 35mA, respectively. The proposed method can offer practical solutions for real RF matching problems to engineers in the beginning step of PCB design.