Authors' Reply [Comments]

The authors of the original letter thank J. J. Taub for reading the letter and for sending several interesting references. However, they feel that reference 7 in original letter is a good review of quasioptical duplexers, but unfortunately it does not contain any of the references supplied by Dr. Taub. The original authors briefly discuss the four references cited in the comment by Dr Taub. All of the referenced devices were duplexers, not isolators. The physical principles governing their operation, however, are essentially the same. The original authors found the cited papers very interesting and informative. They also noted that as many times in the past, they realize that most things in electrical engineering have already been done.