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Two-section asymmetric coupled-line impedance transforming directional couplers

机译：两段式非对称耦合线阻抗变换定向耦合器

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摘要

Two-section impedance transforming directional couplers have been proposed. It has been shown that such asymmetric coupled-line directional couplers can provide equal power split between the coupled and transmission ports as well as impedance transformation in the same broad frequency range, as classic two-section coupled-line couplers. The theoretical analysis has been presented and appropriate formulas allowing for calculation the required per-unit-length parameters of broadband two-section impedance transforming couplers have been derived. Moreover, it has been shown that the impedance transformation ratio of the presented coupler can be increased by the appropriate modification of the two-section coupled-line directional coupler in a way that the directly fed and coupled-line transformation ratios are different. The proposed modification allows for the design of broadband impedance transforming directional couplers with increased transformation ratio over the limit fixed by the coupling coefficient of the tightly coupled section and having at the same time acceptable impedance match and isolation between the respective ports. The presented theory has been confirmed by the measurements of a two-section 3 dB impedance transforming directional coupler having bandwidth / = 3:1 and impedance transformation ratio = 2.
机译：已经提出了两段式阻抗变换定向耦合器。已经证明，与传统的两段式耦合线耦合器一样，这种非对称耦合线定向耦合器可以在耦合端口和传输端口之间提供相等的功率分配，并且可以在相同的宽频率范围内提供阻抗变换。提出了理论分析，并得出了适合计算宽带两段式阻抗转换耦合器每单位长度参数所需的适当公式。而且，已经表明，通过适当修改两部分耦合线定向耦合器，可以以直接馈送和耦合线变换率不同的方式来增加所提出的耦合器的阻抗变换率。提出的修改允许设计宽带阻抗变换定向耦合器，该宽带阻抗变换定向耦合器在由紧密耦合部分的耦合系数所确定的极限范围内具有增大的变换比，并且同时在各个端口之间具有可接受的阻抗匹配和隔离。通过对带宽为= = 3：1且阻抗变换比= 2的两段式3 dB阻抗变换定向耦合器的测量结果证实了所提出的理论。

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