In this letter, a compact and broadband directional coupler is proposed for high-power radio frequency applications in the frequency band of 5–150 MHz. The coupler is composed of a suspended semiflexible coaxial cable and a series of equalizers composed of lumped components. Such design exhibits excellent performance in high power handling capacity (~kW), high directivity (~35 dB), low return loss (>20 dB), and flat coupling coefficient (45 ± 1.3 dB).

中文翻译：

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用于高功率射频应用的紧凑型宽带定向耦合器

在这封信中，提出了一种紧凑型宽带定向耦合器，用于 5–150 MHz 频段的高功率射频应用。耦合器由悬挂式半柔性同轴电缆和一系列集总元件组成的均衡器组成。这种设计在高功率处理能力 (~kW)、高方向性 (~35 dB)、低回波损耗 (>20 dB) 和平坦耦合系数 (45 ± 1.3 dB) 方面表现出优异的性能。