Modified quarter wavelength combiner with Wilkinson resistance

For the operation of Synchrotron Light Research Institute, the 118 MHz high power source is constructed by combining many medium power generators. As a result, the power combiner has to be designed for high power and low return loss. Quarter wavelength combiner which is made of coaxial cable is the suitable choice for high power but the return loss is not good. To improve such a deficiency, this paper proposes the modified quarter wavelength combiner with the concept of Wilkinson resistance. The proposed combiner has been implemented and its results confirm the improvement on return loss.