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Tunable Impedance Transformer Based on Split Strip Lines

机译：基于分裂带状线的可调阻抗变压器

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摘要

In this work we represent a tunable three-section impedance transformer made on the basis of cascade-connected sections of strip lines. The second and third sections are made on coupled three-wire strip lines. These lines are formed by split strip lines and by control strips overlapping the parts of split strip lines on an additional substrate. Transformer parameter control is performed by regulating the capacitance of lumped elements that are inserted between the control strips and the ground plane. The use of split strip lines makes it possible to obtain a more uniform distribution of current density over the cross section of the strips. A change in the regulation capacitances leads to a variation in the characteristic impedance of the second and third stages of the transformer up to 50% of the average value. As a result, the controlled transformer was tuned to a pre-determined return loss level of -20dB with an input load of 50 Ohm and output loads from 2.3 Ohm to 3.98 Ohm in the ±15% frequency band.
机译：在这项工作中，我们代表了一种基于条带线的级联部分制成的可调谐三段阻抗变压器。第二和第三部分是在耦合的三线条带上制造的。这些线由分割条线和通过控制条与附加基板上的分割条线的部件重叠的控制条形成。通过调节在控制条和接地平面之间插入的块状元件的电容来执行变压器参数控制。分裂条线的使用使得可以在条带的横截面上获得更均匀的电流密度分布。调节电容的变化导致变压器的第二和第三阶段的特征阻抗的变化，高达平均值的50％。结果，控制变压器被调谐到预定的返回损耗电平-20dB，输入负载为50欧姆，输出载荷在±15％频带中的2.3欧姆到3.98欧姆。

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