A spiral-coupled-line-based Ka -band (26.5–40 GHz) CMOS Wilkinson power divider with a shunt capacitor (C) at the input and a shunt RC (or C) between the outputs is reported. The spiral coupled line, i.e., two noninverting spiral transmission lines (TLs) with magnetic coupling, has a positive mutual inductance. This leads to a significant TL-length reduction (from about $\lambda $ /7 to $\lambda $ /12) for a specific TL series inductance. At 33 GHz, the power divider achieves prominent $S_{11}$ of −21.5, $S_{22}$ of −22.1, $S_{33}$ of −22.1, $S_{32}$ of −26.1, $S_{21}$ of −4.063, and $S_{31}$ of −4.052 dB. The corresponding amplitude imbalance (AI) and phase difference (PD) are −0.011 dB and −0.336°, respectively. Moreover, $S_{11}$ is smaller than −10 dB for 0–45.3 GHz, corresponding to 137.3% fractional bandwidth (FBW). $S_{32}$ is smaller than −10 dB for 24.1–40.2 GHz, covering the Ka -band and corresponding to 48.8% FBW. The power divider occupies a normalized area of $1.2\times 10^{-4}\lambda _{0}^{2}$ , one of the smallest normalized chip areas ever reported for millimeter-wave power dividers.

中文翻译：

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基于螺旋耦合线的威尔金森功率分配器

基于螺旋耦合线 K a 报告了一个带（26.5–40 GHz）CMOS Wilkinson功率分配器，该功率分配器在输入端带有一个并联电容器（C），在输出之间带有一个并联RC（或C）。螺旋耦合线，即两条具有磁耦合的同相螺旋传输线（TL），具有正互感。这导致TL长度显着减少（从 $ \ lambda $ / 7至 $ \ lambda $ / 12）用于特定的TL串联电感。在33 GHz时，功率分配器达到了卓越的效果 $ S_ {11} $ 的-21.5， $ S_ {22} $ 的-22.1 $ S_ {33} $ 的-22.1 $ S_ {32} $ 的-26.1， $ S_ {21} $ 为-4.063，并且 $ S_ {31} $ 为-4.052 dB。相应的幅度不平衡（AI）和相位差（PD）分别为-0.011 dB和-0.336°。而且， $ S_ {11} $ 在0-45.3 GHz时小于-10 dB，相当于137.3％的分数带宽（FBW）。 $ S_ {32} $ 在24.1–40.2 GHz时小于-10 dB，覆盖了 K a 频段，对应于48.8％的FBW。功率分配器占用的归一化面积为 $ 1.2 \乘以10 ^ {-4} \ lambda _ {0} ^ {2} $ ，这是毫米波功率分配器有史以来最小的标准化芯片面积之一。