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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Dual-band microstrip-to-coplanar stripline Wilkinson balun using composite right- and left-handed transmission lines and its application in feeding dual-band bow-tie antenna
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Dual-band microstrip-to-coplanar stripline Wilkinson balun using composite right- and left-handed transmission lines and its application in feeding dual-band bow-tie antenna

机译：复合左，右手传输线的双频带微带至共面带状线威尔金森巴伦及其在双频带领结天线馈电中的应用

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摘要

Using a composite right- and left-handed transmission lines, a dual-band microstrip-to-coplanar stripline balun is proposed that presents the benefits of bandwidth enlargement, excellent isolation and equal power split between output ports in the two passbands. Also, the dual-band nature of the balun, close space between output ports and ease of integration with a printed antenna in a compact size make it well suited for feeding dual-band planar two-wire antennas. As an example of an application, the proposed balun is designed and fabricated to work at two arbitrary frequency bands, 0.9 and 1.8 GHz. There is a good agreement between the measured and predicted results, which verifies the proposed design methodology. The fabricated balun shows a measured differential output phase bandwidth (180 0; 1; 10 0;) of 22.95% and 18.76% for the first and second frequency bands, respectively. Moreover, this device is shown to have enhanced bandwidth performance in both isolation and 3-dB magnitude balance. To validate the performance of the proposed balun, the balun is employed to feed a dual-band metamaterial-loaded bow-tie antenna. The experimental results show that the return losses for both the operating bands remain below 10 dB. Likewise, the dual-band bow-tie antenna provides quasi-omnidirectional radiation over the frequency bands.
机译：提出了一种使用右手和左手复合传输线的双频带微带至共面带状线不平衡变换器，该变换器具有带宽增大，出色的隔离性和两个通带中输出端口之间的均等功率分配的优点。此外，巴伦的双频特性，输出端口之间的紧密空间以及易于与印刷天线集成的紧凑型尺寸使其非常适合于馈送双频平面两线制天线。作为一个应用实例，拟议的巴伦被设计和制造为可在两个任意频带0.9和1.8 GHz下工作。在测得的结果和预测的结果之间有很好的一致性，可以验证所提出的设计方法。所制造的平衡-不平衡转换器显示出在第一和第二频带分别测得的差分输出相位带宽（180 0; 1; 10 0;）为22.95％和18.76％。而且，该器件在隔离和3dB幅度平衡方面均具有增强的带宽性能。为了验证所提出的平衡-不平衡变换器的性能，平衡-不平衡变换器被用于馈送双频带超材料加载的领结天线。实验结果表明，两个工作频带的回波损耗均保持在10 dB以下。同样，双频带领结天线在频带上提供准全向辐射。

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