Abstract
In this letter, the modified small reflection theory is further extended to the design of a multifrequency transformer with an arbitrary frequency and real impedance transform ratio, by mapping small reflection coefficients between $2N+m$ - and $2N$ -section transformers. Due to the introduced mapping, the dominated equation of the $2N+m$ -section transformer is reduced to that of the $2N$ -section transformer without introducing an additional matching frequency among the desired frequency ratio range. For verification, a penta-frequency transformer is implemented and measured. The measured results agree closely with the calculated and simulated results.
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