一种新型微带/槽线混合结构的宽带魔T

A Novel Wide Band Magic-T Combined with Microstrip-Slotline

提出一种新型宽带平面魔T结构,该魔T基于传统的微带混合环的原理设计而成,为扩展工作频带,采用了微带-槽线混合结构,通过将槽线T接头功分器的反相输出特性与微带T接头功分器的同相输出特性相结合,从而实现两输出端口的宽带和/差输出.测量数据表明该魔T结构可实现超过25%的相对工作带宽(输入端口回波损耗低于-10dB),在工作频带(4.3～5.6GHz)内,其传输插损小于1dB,两对隔离端口的隔离度分别为-30dB和-20dB.

A novel wide band planar Magic-T is presented. It is designed based on the traditional principle of microstrip hybrid ring, By employing coupling microstrip-slotline configuration, its bandwidth is improved. Microstrip-slotline Tjunction is used to achieve the in-phase and out-phase coupling characteristic. The operation bandwidth of this magic-T is from 4, 3 to 5.6 GHz centered at 5 GHz, which is over 25% for return loss lower than - 10 dB. Furthermore, it is also shown that its insertion loss is lower than 1 dB and the isolation between each port pairs are lower than - 30 dB and - 20 dB over the operation frequency band respectively.