Abstract: In this paper, a signal transmission network with the characters of miniaturization high integration and high reliability was designed using the technic of complex signals integrated,which have the functions of power distribution and synthesization between 14GHz and 18GHz, signals controlling the wave-beams distribution and transmission, power supply and so on. at the same time,EMI and SI simplified were researched making use of the co-simulation mode including RF and digital signals. Several troubles including the resonance about RF-network working on Ku band, the reflection, crosstalk were improved prominently on the complex EM condition. The test proved the co-simulation was precision and availability. The way expounded is reformation to the tradition antennas array of radar,which accords with the tendance of miniaturization,hign-in-tegration , complex EM condition and high reliability of radar.