Ha, D.H. Chai, J.-S. Gad, Kh.M. Ghergherehchi, M. Kim, H.S. Lee, J.C. Namgoong, H. JACoW Publishing Geneva, Switzerland 978-3-95450-205-9 10.18429/JACoW-Cyclotrons2019-MOP029 English 97-99 MOP029 insertion simulation ISOL coupling target Contribution to a conference proceedings 2020 2020-06 https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP029 http://jacow.org/cyclotrons2019/papers/mop029.pdf The purpose of this study is to improve the insertion loss of a 20 kW solid-state RF power amplifier and the power coupling efficiency by reducing reflected power. For this purpose, a power combiner, which is a core component of a solid-state RF power amplifier, was designed and fabricated. The 4-way power combiner employs the Wilkinson type, which has excellent power coupling efficiency and isolation, and operates at 83.2 MHz. This paper covers the design and cold test results.