宽带巴伦的研究与仿真

在宽带Marchand巴伦设计中,为获得高宽带,并得到较好的端口匹配性能,采用三线耦合微带线代替双线耦合线增加耦合度以扩展带宽。同时利用电容、电感补偿法和阻抗网络法提高端口匹配性能。仿真结果表明：在满足宽带的要求下,端口匹配度、输出平衡度和相位差都得到较大改善。在20GHz～55GHz带宽内,S22,S33均小于-15dB,S23小于-10dB,S21在-3.6dB左右,幅度差为0.1dB左右。

Study and simulation of wide-band Balun

In the design of wide-band Marchand Balun,the three-conductor coupled lines which replace the two-conductor coupled lines were adopted to broaden the bandwidth and enhance the coupling factor.The capacitance,inductance compensation and impedance network were utilized to improve port match performance.Simulation results show that the port match,output balance and phase differences have been improved.Between the bandwidth from 20 GHz to 55 GHz,S22,S33 are both smaller than-15 dB,while S23,S21 are smaller than-10 dB and-3.6 dB respectively.The amplitude difference is about 0.1 dB.