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A novel miniaturized, wideband, high directivity microstrip coupler on FR4

机译：FR4上的一种新型小型化，宽带，高方向性微带耦合器

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Directional couplers realized in microstrip parallel coupled line configuration exhibits very poor directivity. Inhomogeneous nature of microstrip circuits generate even and odd modes of wave propagation having different phase velocities, which in turn leads to the degradation in directivity. This paper presents the design and development of a compact, wideband, low insertion loss 20 dB microstrip coupler on FR4 substrate having better than 25 dB directivity at L band. Idea is based on the fact that the wiggly or slotty structure raises the odd mode inductance more strongly than that of the even mode due to the different field distributions between both modes and equalizes the even and odd mode characteristic impedances. Reactive loading based slow wave structure is used to further miniaturize the circuit. Directivity of better than 28 dB, maximum insertion loss of 0.4 dB, coupling flatness of ± .25 dB and 25 % reduction in size w.r.t. conventional parallel coupled line coupler were observed in the fabricated circuit over the band of 1250±500 MHz.
机译：在微带平行耦合线配置中实现的定向耦合器表现出非常差的方向性。微带电路的不均匀性质产生具有不同相速度的均匀波传播的偶数和奇数模式，这反过来导致方向性的劣化。本文介绍了在用于L频段的FR4基板上的紧凑，宽带，低插入损耗20 DB微带耦合器的设计和开发。思想基于：由于两种模式之间的不同场分布并均衡偶数和奇数模式特征阻抗，所唤醒或插槽结构提高了奇数模式的奇数电感比偶数模式的电感更强烈。基于反应加载的慢波结构用于进一步小型化电路。方向性优于28 dB，最大插入损耗为0.4dB，耦合平整度为±25dB，尺寸减小25％。在1250±500MHz的带中，在制造的电路中观察到传统的并联耦合线耦合器。

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