Wideband balanced networks with wideband common mode suppression and arbitrary power-dividing ratio

Two novel wideband balanced networks with wideband common mode suppression and arbitrary power-dividing ratio are proposed in this paper. The differential/common mode equivalent circuits of the balanced networks can be easily reduced based on the matrix transformation. Microstrip-slotline 180 degrees phase inverters loaded with four isolation resistors are used to realize high isolation for the power division output ports. Two planar wideband equal and unequal power division balanced networks with bandwidths of 33% of (1:1, equal) and 39% (1:2.2(2), unequal) for the differential mode and over 120% common mode suppression (0.96-3.6GHz, |S-cc21,S- 31|<-10dB) are designed and fabricated.