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In the letter a field-theory treatment of a new type of nonreciprocal ferrite device, the quasicyclic ferrite junction (QF), is presented. The QF junction utilises properties of the three-port EG-mode circulator in which one edge is short-circuited to the ground plane. The main feature of the junction is mutual isolation between two ports joined by the short-circuited edge. The boundary problem is solved by means of the point-matching technique. Finally, experimental results are carried out to verify the obtained numerical dates.