[7] “New Balance: The New Applications of Dual-mode Ring Resonators for Planar Balanced Circuits”, IEEE Microwave Magazine, vol. 20, no. 7, pp. 15–23, Jul. 2019.

作者：Wenjie Feng, Wenquan Che, Quan Xue

摘要：Recently, 4G and 5G microwave com munication circuits and systems have been undergoing rapid development. Signal crosstalk and high costs have seriously limited the fast development of microwave technology and multilayer integrated circuits, while radiation power loss of commonmode noise can be up to 25% of the input power in the Ka band (22–27 GHz). For the past 10 years, different balanced circuits with higher immunity to environmental noise, lower electromagnetic interference, and better dynamic range have attracted increasingly more attention. Balanced filters, balanced power dividers, and crossovers are the most commonly used planar balanced circuits. In our opinion, for passive balanced circuits, some simple design objectives can be summarized as follows: 1) simpler balanced circuit structures, 2) high passband selectivity and wideband harmonic suppression for the differential mode, and 3) wideband and high-level commonmode suppression.