Reply to “Comments on ‘An Analytical Design Method for a Novel Dual-Band Unequal Coupler With Four Arbitrary Terminated Resistances’”
Abstract: The phase-difference performance at two desired frequencies of the generalized dual-band unequal coupler is discussed and presented in this comment as supplementary information. The condition of {?S21-?S31}f1+{?S21-?S31}f2=p and the analytical equations for {?S21-?S31}f1orf2 are provided. It can be concluded that the dual-frequency output phase differences are constant and equal to 90° when R2=R3, but the values of R1 and R4 can be varied. Finally, the calculated results show that the phase-difference variations about ±11% in the whole useful bandwidths of these branch-line couplers are objective and acceptable in common practical applications when R2 and R3 are in the range of 30–100 O (R2?R3).
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