Design and Optimization Method of Broadband High‐Efficiency Power Amplifier Using Irregular Matching Network

This paper proposes a design method for broadband power amplifier (PA) using irregular matching structure based on an improved multi‐objective optimization algorithm, aiming at expanding its operating bandwidth. Initially, the gravitational search algorithm is enhanced by reconstructing the gravitational constant function for improving its global optimization capability. Subsequently, a fast non‐dominated sorting mechanism combined with a crowding distance strategy is introduced for multi‐objective optimization problems. Furthermore, to effectively overcome the bandwidth limitations that are inherent in conventional PA, the proposed multi‐objective gravitational search algorithm is employed for optimizing the irregular structure matching network. For verification, a broadband high‐efficiency PA is designed and fabricated, covering a frequency range of 0.4–4.0 GHz with a relative bandwidth of 163%. Measurement results show that the PA with the irregular matching structure maintains an efficiency of 59.1%–64.4% across the entire operating band, with a saturated output power of 40.3–41.8 dBm.