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Abstract
This paper presents the novel design and analysis of a 25 W broadband Class-AB GaN HEMT-based power amplifier working over 0.9–1.7 GHz. A large signal model of the Wolfspeed-make GaN HEMT CG2H40025 has been used in this design. The comprehensive design process has been carried out with the help of the Advanced Design System software by Keysight. Instead of conjugately matching the load and source impedance obtained from load-pull analysis of a nonlinear model of CG2H40025, the value of load and source impedance has been tuned with the help of a novel design approach of an ideal matching design approach. Thus, to achieve an output power of more than 25 W and a flat large signal gain of 15.425 ± 0.375 dB, a novel design approach has been employed to create input and output matching networks, maintaining a lower Q value results in broad bandwidth and for determining the load and source impedances. The circuit has been fabricated on Roger’s substrate RO4350B having a dielectric constant of 3.66 and a loss tangent of 0.0031. The unique design approach based on electromagnetic simulation of the circuit at each design step yielded experimental results that agreed very well with the simulated results. The fabricated power amplifier achieves a power-added efficiency of over 54.78% and a drain efficiency of over 55.45% throughout the entire frequency range. It also delivers a maximum output power of 32.18 W at 1.3 GHz. This power amplifier is developed for L-band Foliage Penetrating Radar.
ACKNOWLEDGEMENTS
The authors are grateful to the Vice Chancellor of DIAT, Pune, India for his support and encouragement.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Yogesh Kumar
Yogesh Kumar is an MTech scholar at the Defence Institute of Advanced Technology, Pune, India, in defence electronic systems, and in 2013 he completed his BTech in electrical engineering from Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Haryana. He is currently the deputy manager (auality and assurance) (electrical and weapons) at Garden Reach Shipbuilders and Engineers Limited, Kolkata (a Ministry of Defence Undertaking). He has five years of experience in the field of warship building and has worked on the integrated platform management system (IPMS) and propulsion control system of eight Indian Navy ships. His current interests are RF power amplifier design and integrated bridge systems (IBS) used for navigation and communication on board naval ships.
Ambudhi Shukla
Ambudhi Shukla received an MTech from the Defence Institute of Advanced Technology, Pune, India in 2022 and a B Tech from Rajasthan Technical University, Kota in 2010. He is presently a manager (design) (electrical & weapons) at Garden Reach Shipbuilders and Engineers Limited, Kolkata (A Ministry of Defence Undertaking). His present work involves the design of the Integrated platform management system and propulsion package for warships under construction at GRSE Kolkata. He is also handling research and development work of various autonomous surface and sub-surface vehicles for the Indian Navy. He is also working for the development and integration of sustainable energy solutions into new-generation passenger ferries. His current interests are RF power amplifier design, H2 fuel cell-powered ships, and AI-based autonomous vessel design. Email: [email protected]
K. P. Ray
K P Ray FNAE received an MTech in microwave electronics from the University of Delhi and a PhD from the department of electrical engineering IIT, Bombay. He has over 38 years of research/academic experience in the areas of RF and microwave systems/components and was the programme director of SAMEER (MeitY) Mumbai and has executed over 55 projects sponsored by various Govt. agencies and industries. He received many awards including the most coveted IETE-Ram Lal Wadhwa Award 2018, the IETE - Ranjna Pal Memorial Award 2014, and several research papers awards. He has published over 500 research papers with more than 8850 citations. Presently, he is a professor and head of the dept of EE, DIAT (DRDO), Pune. Email: [email protected]; [email protected]