A Wide-Band Miniaturization Power Amplifier by Using Short-Step Chebyshev Impedance Transformer

In this paper, a wide-band miniaturization power amplifier (PA) is proposed. A short-step Chebyshev impedance transformer is used to solve the output match circuits of the proposed PA. By selecting the match impedance value with compromise in desired pass-band appropriately, the short-step Chebyshev impedance transformer realizes wide-band impedance matching as well as miniaturization. A brief analysis of the short-step Chebyshev impedance transformer is presented. To prove the effectiveness of this method, a wide-band miniaturization PA operating from 1 to 3 GHz is designed, simulated and measured. The measured results show that the saturated output power of 41-42.7 dBm with the gain of 9.2-11.6 dB is achieved, and the power-added efficiency (PAE) is 51.5-64.8%. The proposed method is potential in the applications of wide-band, miniature PA, and so on.