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

ABSTRACT

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° 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% (1:2.2², unequal) for the differential mode and over 120% common mode suppression (0.96–3.6 GHz, |S _{cc21, 31}| < –10 dB) are designed and fabricated.

KEYWORDS:

• Wideband
• equal/unequal
• balanced network
• differential/common mode
• power division

Additional information

Funding

This work was supported by the 2012 Distinguished Young Scientist awarded by the National Natural Science Foundation Committee of China [61225001]; Natural Science Foundation of China [61401206], [61571231]; Jiangsu Province [BK20140791]; the 2014 Zijin Intelligent Program of Nanjing University of Science and Technology.