New Compact Enhanced-Bandwidth Hybrid Ring
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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.