Improved planar Marchand balun using a patterned ground plane
Improved planar Marchand balun using a patterned ground plane
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DOI：
10.1002/mmce.20084
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发表时间：
2005-05
期刊：
影响因子：
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通讯作者：
Zhenyu Zhang;Yong-xin Guo;L. Ong;M. Chia
中科院分区：
文献类型：
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作者：
Zhenyu Zhang;Yong-xin Guo;L. Ong;M. Chia
在本文中，提出了一种使用图案化接地平面的新型平面 Marchand 巴伦。这种新设计在接地平面上切割的耦合线下方有一个槽，因此可以大幅增加偶模阻抗。同时，我们建议在耦合线下方放置两个额外的分离矩形导体，以充当两个电容器，从而降低奇模阻抗。介绍了优化 Marchand 巴伦的设计理论和程序。例如，设计、模拟、制造和测量了双面 PCB 上的 Marchand 巴伦。发现在 1.2 至 3.3 GHz 频段（即 100% 带宽左右）测得的回波损耗优于 −10 dB。在工作频段上，两个平衡输出端口之间测得的幅度和相位不平衡度分别在 1 dB 和 4° 以内。 © 2005 Wiley periodicals, Inc. Int J RF 和微波 CAE，2005 年。
In this article, a novel planar Marchand balun using a patterned ground plane is presented. This new design has a slot under the coupled lines cut on the ground plane so that the even‐mode impedance can be increased substantially. Meanwhile, we propose that two additional separated rectangular conductors be placed under the coupled lines in order to act as two capacitors, so that the odd‐mode impedance will be decreased. The design theory and procedure for optimizing the Marchand balun are presented. As an example, one Marchand balun on a double‐sided PCB is designed, simulated, fabricated, and measured. The measured return loss is found to be better than −10 dB over the frequency band from 1.2 to 3.3 GHz, or around 100% bandwidth. The measured amplitude and phase imbalance between the two balanced output ports are within 1 dB and 4°, respectively, over the operating frequency band. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005.