一种新型的高功率微尺度射频传输线巴伦研究

Research of a novel transmission balun with high power and mico-scale

本文根据传输线巴伦原理,设计出一种基于片上电感形式的巴伦结构,该结构可以使用在高功率射频功率放大器进行平衡到不平衡转换、可增加匹配网络实现阻抗变换。该微尺度传输线巴伦采用2层PCB印制板结构实现片上电感,PCB材料采用FR4,以实现电容、感谐振,实现能量传递和阻抗变换。使用该种方式可以避免磁芯、电感等器件带来的制造工艺复杂、尺寸较大等一序列问题,同时带宽可达到10MHz以上、且能承受较大的功率能力。本文设计的1:1变压器巴伦的端口驻波可达到-20dB以上,损耗小于0.3dB,同时实现1:1阻抗变巴伦变换。尺寸仅为60mm×30mm,可承受功率为1KW以上,该射频集成巴伦可使用在低频100MHz射频功率放大器系统中作功率分配、合成及其阻抗匹配使用。

ON-chip inductor structure balun is researched and developing by the principle of transmission line balun,in this paper.This design structure was applied in the high power RF amplifier to realize the balance to unbalance and also to get the impedance matching with matching network.This micro-scale balun is2 layers PCB which is FR4 material,and the final to realize the power transition and impedance transformer with capacitor and inductor resonator.This balun has small size,easy to manufacturing,bandwidth large than 10 MHz and under high power capability.Port VSWR(Voltage Standing Wave Ratio)is not more than-20 dB,IL(Insert Loss)is not more than 0.3dB and also realize the 1:1impedance transformer.Size is 60mm(30mm and power capability is large than 1KW.It could be used 100 MHz RF large power amplifier system as power combine,splitter and impedance matching.