Development of an 83.2 MHz, 3.2 kW solid-state RF amplifier using Wilkinson power divider and combiner for a 10 MeV cyclotron

Ho Seung Song; Mitra Ghergherehchi; Seyoung Oh; Jong Seo Chai

doi:10.1063/1.4978652

Development of an 83.2 MHz, 3.2 kW solid-state RF amplifier using Wilkinson power divider and combiner for a 10 MeV cyclotron

Rev Sci Instrum. 2017 Mar;88(3):034706. doi: 10.1063/1.4978652.

Authors

Ho Seung Song¹, Mitra Ghergherehchi¹, Seyoung Oh², Jong Seo Chai¹

Affiliations

¹ College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, South Korea.
² Department of Energy Science, Sungkyunkwan University, Suwon 16419, South Korea.

PMID: 28372372
DOI: 10.1063/1.4978652

Abstract

We design a stripline-type Wilkinson power divider and combiner for a 3.2 kW solid-state radio frequency (RF) amplifier module and optimize this setup. A Teflon-based printed circuit board is used in the power combiner to transmit high RF power efficiently in the limited space. The reflection coefficient (S₁₁) and insertion loss (S₂₁) related to impedance matching are characterized to determine the optimization process. The resulting two-way divider reflection coefficient and insertion loss were -48.00 dB and -3.22 dB, respectively. The two-way power combiner reflection coefficient and insertion loss were -20 dB and -3.3 dB, respectively. Moreover, the 3.2 kW solid-state RF power test results demonstrate that the proposed power divider and combiner exhibit a maximum efficiency value of 71.3% (combiner loss 5%) at 48 V supply voltage.