Title :
Comment on “A Dual-Frequency Transformer for Complex Impedances With Two Unequal Sections”
Author :
Dutta Roy, Suhash C.
Abstract :
The analysis presented in the above titled paper is defective because equations (7a)-(7d) are based on the assumption that the complex impedances Z0 and ZL do not change when the frequency changes from f 1 to f2 = mf 1. As a result, the numerical solutions based on these equations are not valid either.
Keywords :
electric impedance; transformers; complex impedances; dual-frequency transformer; frequency changes; unequal sections; Curve fitting; Equations; Frequency estimation; Matrix decomposition; Microwave theory and techniques; Parameter estimation; Sparse matrices; Transfer functions;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2009.2027102
