A NOVEL DUAL-LAYER HIGH-DIRECTIVITY DIRECTIONAL COUPLER USING PRINTED METAMATERIAL MS/NRI COUPLED-LINE

作者：Zhao, Shiwei^*; Tang, Zongxi; Dal, Wei; Zhang, Biao

来源：Microwave and Optical Technology Letters, 2010, 52(12): 2706-2708.

DOI：10.1002/mop.25573

• high directivity
• dual-layer structure
• MS/NRI coupled-line coupler
• wider bandwidth
• smaller size

A dual-layer, multi-aperture and multi-section asymmetric printed metamaterial MS/NRI coupled-line coupler is presented. The configuration consists of two-layer back-to-back substrates with five small coupling apertures on the center ground plane. In addition, asymmetric coupled-line sections connected in cascade with the coupling decreasing gradually from one end to the other. This novel dual-layer coupler with high directivity can operate in wider bandwidth. Furthermore, it has smaller size and lower insertion loss. The circuit area of the proposed coupler is only 70% of that of the conventional dual-layer coupler. Simulated and experimental results of the coupler exhibited a coupling of about 15 a, isolation of about 50 dB, and directivity of about 35 dB at the design frequency front 3.25 to 5 GHz (with better than 45 dB directivity over 500 MHz).

• 出版日期2010-12
• 单位电子科技大学