Stripline dual-band ferrite circulators operating on weak field conditions

This paper presents a new concept of dual-band circulators using a weak field biased ferrite. Two prototypes were designed and measured, one with the same circulation direction between the first and the second band (unidirectional circulator) and the other one with an opposite circulation direction (bidirectional circulator). These new designs allow a control of the two operating frequencies and a widening of bandwidths.