Dual-Band Design Theory for Dual Transmission-Line Transformer
Dual-Band Design Theory for Dual Transmission-Line Transformer
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DOI：
10.1109/lmwc.2017.2734777
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发表时间：
2017-08
影响因子：
3
通讯作者：
Xiaolong Wang;Zhewang Ma;M. Ohira
中科院分区：
文献类型：
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作者：
Xiaolong Wang;Zhewang Ma;M. Ohira
在这封信中，介绍了一种新颖的双传输线（TL）变压器的双频带（DB）设计理论，它仅由两个具有不同物理长度的并行TL组成。这两个特性阻抗及其物理长度的设计方程以封闭形式导出。通过数学分析，重新总结并证明了分别在偶数和奇数物理长度比条件下的两种不同的DB设计表达式。事实证明，所提出的拓扑可以实现比传统工作低约八倍的阻抗变换比。为了验证目的，对两个具有不同频率比的 5–$50~\Omega$ 变压器进行了仿真、制造和测量。测量结果和仿真结果吻合得很好。
In this letter, a novel dual-band (DB) design theory for dual transmission-line (TL) transformer is introduced, and it only consists of two parallel TLs with different physical lengths. Design equations for these two characteristic impedances and their physical lengths are derived in closed form. Through mathematical analysis, two different DB design expressions are newly summarized and proved under the condition of even and odd physical length ratios, respectively. It is proven that the proposed topology could realize around eight times lower impedance transformation ratio than that in conventional works. For verification purposes, two 5– $50~\Omega $ transformers with different frequency ratios have been simulated, fabricated, and measured. Measured and simulation results are matched very well.