小型化新型宽频带环形电桥

New Compact Enhanced-Bandwidth Hybrid Ring

采用人工合成左/右手传输线结构,设计了两种新型的小型宽频带环形电桥.通过在电桥中用±90°枝节代替290°枝节,使环形电桥的电路面积减小了75%,工作于2 GHz的第1种环形电桥的同相输出带宽增加了50%,180°反相输出带宽增加了49%.通过在电桥中引入0°枝节,使第2种电桥可以对具有0°,90°,180°和270°相差的两个信号进行同相或反相混合,同相输出带宽增加了38%.

Two new compact enhanced-bandwidth hybrid rings using composite right/left-handed transmission lines are designed. The replacement of the 270° branch by ±90° ones results in at least 75° reduction in size of the hybrid ring compared with the conventional one. At the same time, the bandwidths of the first hybrid ring operating at 2GHz are enhanced by 50~ in the in-phase operation, and 49°in the 180°-out-of-phase operation. The introduction of the 0° transmission line branches makes it possible that the second new hybrid ring be used as a mixer of two signals with -90°, 0°, 90° or 180° phase difference. The bandwidth is enhanced by 38% in the in-phase operation.