Compact Two-Section Half-Wave Balun Based on Planar Artificial Transmission Lines
Compact Two-Section Half-Wave Balun Based on Planar Artificial Transmission Lines
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DOI：
10.1155/2015/256536
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发表时间：
2015-05
影响因子：
1.5
通讯作者：
Changjun Liu;Zhenyu Yin;Yilan Yang;Wen Huang
中科院分区：
文献类型：
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作者：
Changjun Liu;Zhenyu Yin;Yilan Yang;Wen Huang
人工传输线是由一系列弯曲线电感、平行板电容器和数字间电容器组成的，属于超材料传输线。为了实现低特性阻抗传输线，提出了一种改进的人工传输线。本文设计、制作并测量了900mhz频率下的两段式半波平衡器。紧凑型平衡器采用传统的和改进的平面人工传输线代替微带传输线。所提出的平衡器的主要优点是体积减小，只占传统平衡器的10%左右。实测结果与理论和仿真结果吻合较好。该平衡器在微波功率组合中具有良好的幅相平衡性能和合理的回波损耗带宽。
Artificial transmission lines are realized by a series of meandered-line inductors, parallel-plate capacitors, and interdigital capacitors, which belong to metamaterial transmission lines. An ameliorated artificial transmission line is proposed to realize a low characteristic impedance transmission line. A two-section half-wave balun at 900 MHz is designed, fabricated, and measured in this paper. The compact balun is based on conventional and ameliorated planar artificial transmission lines instead of microstrip transmission lines. The main advantage of the proposed balun is its size reduction, which occupies only about 10% of a conventional one. Measured results match well with theory and simulation. The balun features excellent amplitude and phase balance in microwave power combining and a reasonable bandwidth of the return loss as well.