Comment and response on "A Compact Single-Stage Balun" [Backscatter]

The commentor (S.C. Dutta Roy) states that that the basic idea behind using two transmission line transformers to extend the bandwidth for matching a load resistance RL to a source resistance Rg, as described in the above-named work [ibid., vol. 19, no. 1, pp. 78–83, Jan.–Feb. 2018], is, except for the output circuit, essentially the same as that given in the paper "A transmission line transformer having frequency independent matching" [Int. J. Circuit Theory Appl., vol. 8, pp. 55– 64, Jan. 1980]. The idea was also patented in the United States in 1980 and included in a volume of classic works in RF engineering in 2006. In replying, the original authors of the above-named work carefully considered Roy's letter and his previous publications. However, they do not agree with his claim that his work was experimentally validated by our work. Because the circuits in these works use two ferrite cores for one transformer, they look similar. However, the circuits are basically different in two ways. Although the original authors acknowledge that Roy's work is sound enough in theory to be tried for future experimental validation, his and our work are very different from each other. They finally note that if they had found Roy's work before writing the article, they would have likely cited it.