Comments on "Quasi-arbitrary phase-difference hybrid coupler"

In the above-named article [ibid., vol. 60, no. 7, pp. 2131-2141, Jul. 2012], the authors propose a new analytical methodology for the sensitivity analysis of microwave filter networks. However, an errata has been found which may affect the readers\´ understanding. The term "reflection poles" has been used instead of the correct term "reflection zeros" three times in the paper. To be precise, the sentence on page 2133 "has two peak values at the frequencies of the reflection poles, which are missing" should be "has two peak values at the frequencies of the reflection zeroes, which are missing." In addition, there are two other occurrences of error on page 2134, where "frequencies where the reflection poles occur" should state "frequencies where the reflection zeros occur."