小孔耦合型双通道太赫兹波导定向耦合器设计

Design of Pinhole-coupled Dual-channel Terahertz Waveguide Directional Coupler

提出了一种小孔耦合型双通道太赫兹波导定向耦合器,采用新颖的阶梯结构,将两个单通道耦合器结合,可在双通道内实现相同的耦合输出。研究结果表明,在180~260 GHz的频率范围内,该耦合器的耦合度为10 dB,输出最大误差小于1.6 dB,回波损耗大于25 dB,隔离度大于35 dB,相对带宽达到36%。与传统的太赫兹波导定向耦合器相比,该耦合器能够实现双通道的耦合输出,在太赫兹系统中可用于双通道的功率检测、功率合成与分配。

A pinhole-coupled dual-channel terahertz waveguide directional coupler was proposed. It adopted a novel ladder structure and combined two single-channel couplers to achieve the same coupling output in two channels. The research results show that in the frequency range of 180~260 GHz, the coupling degree of the coupler is 10 dB, the maximum output error is less than 1.6 dB, the return loss is greater than 25 dB, the isolation degree is greater than 35 dB, and the relative bandwidth is 36%. Compared with the traditional terahertz waveguide directional coupler, this coupler can realize dual-channel coupling output, and can be used for dual-channel power detection, power synthesis and distribution in terahertz systems.