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Improved planar Marchand balun using a patterned ground plane

机译:使用带图案的接地平面改进了平面Marchand巴伦

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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 degrees, respectively, over the operating frequency band. (c) 2005 Wiley Periodicals, Inc.
机译:在本文中,提出了一种使用带图案的接地平面的新型平面马尔尚巴伦。这种新设计在接地平面上切割的耦合线下方有一个插槽,因此可以大幅提高偶数模式阻抗。同时,我们建议在耦合线下放置另外两个分开的矩形导体,以充当两个电容器,从而降低奇模阻抗。提出了优化马尔尚巴伦的设计理论和程序。例如,设计,模拟,制造和测量双面PCB上的一个Marchand巴伦。发现在1.2至3.3 GHz的频带或大约100%的带宽范围内,测得的回波损耗优于-10 dB。在工作频带上,两个平衡输出端口之间测得的幅度和相位不平衡分别在1 dB和4度以内。 (c)2005年Wiley Periodicals,Inc.

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