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AWR2243: L0本振信号功分器

Part Number: AWR2243


参考AWR2243的4片级联demo的layout,在电磁仿真软件中复原LO本振信号的一分二威尔金森功分器,仿真结果显示该功分器的S21达到了大约-9dB,请问可能有何种原因导致了该多层结构功分器损耗如此之大?