An improved harmonics suppression power amplifier circuit using integrated self‐resonant capacitor for radar application

• Published in: International journal of circuit theory and applications 2024-02, Vol.52 (2), p.513-522
• Main Authors: Yang, Fan, Li, Zhanguo, Xu, Yuehang
• Format: Article
• Language: English
• Subjects: capacitance resonance; Capacitors; Electromagnetic compatibility; gallium nitride (GaN); Gallium nitrides; Harmonics; high harmonics suppression (HSs); Integrated circuits; MMIC (circuits); monolithic microwave integrated circuit (MMIC); power amplifier; Power amplifiers; Power gain; Pulse duration; Radar networks
• ISSN: 0098-9886; 1097-007X
• DOI: 10.1002/cta.3780

Summary In order to ensure that the electromagnetic compatibility and mutual interference of multiple radar network systems meet the requirements, a 55‐W gallium nitride (GaN) high harmonics suppression (HSs) high power amplifier (HPA) microwave monolithic integrated circuit (MMIC) with an operating frequency of 5.1–6.3 GHz is designed for radar network system. An HSs method using self‐resonant capacitor integrated in the output matching network of HPA is proposed to improve the HSs characteristics. The measured results show that under the condition of 100‐μs pulse width and 10% duty cycle, the HSs are greater than 48 dBc while the output power is greater than 55 W, the power gain is 21 dB, and the power additional efficiency (PAE) is 54%, which is suitable for use in radar network system. The size of the HPA is 3.55 × 4.05 mm2. This paper presents a new output matching topology using integrated self‐resonant capacitor with harmonics suppression function for high power amplifier. It does not affect the output power and efficiency of the power amplifier while improving harmonics suppression for radar application. The proposed high power amplifier meets the application requirements of radar network to reduce interference between different electronic equipment.