Abstract
This article presents the design and fabrication of 20± 0.3dB directional coupler having 2kW power handling capability in the frequency range of 140-200MHz. The developed coupler has an important application in the prototype of the Ion Cyclotron Resonance Frequency (ICRF) system of Tokamak. The directional coupler used to couple the forward and reflected power for measurement and provide the feedback to the existing matching network responsible for protecting the high power RF source. The prototype ICRF system has been developed to test the matching speed of the ICRF system for load resilient operation. The developed coupler is compact in size, robust, and capable of handling 2kW, continuous wave (cw) RF power. This paper also analyses the dielectric breakdown strength using electric field distribution inside the coupler and the average power handling capability is determined using numerical analysis. The test and simulation results of developed coupler are found in good agreement. The test results using Vector Network Analyzer (VNA) are obtained as, the coupling flatness of 20 ± 0.3 in 140-200 MHz frequency range, return loss and isolation are -30dB and -35dB respectively. The work presented in this paper is helpful for the design and development of high power coupler in radio frequency (RF) range and may be applied in various applications such as RF Plasma, Radar, navigation, satellite and research etc.
Published Version
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