We present a novel compact wideband waveguide T-junction power divider, especially suited for millimeter-wave and THz frequencies. It incorporates substrate-based elements into a waveguide structure to provide the output port's isolation and matching. The internal port is introduced at the apex of the T-junction formed as an E-probe on a substrate. This facilitates efficient coupling of the reflected energy from the output port to a novel thin-film-based resistive termination integrated with the E-probe onto the same substrate and fabricated by means of thin-film technology. A power divider was designed, simulated, and fabricated for the frequency band 150-220 GHz to experimentally verify the theoretical and simulated performance. The results showed excellent agreement between the simulations and measurements with the devices demonstrating a remarkable return loss of 20 dB for both the input and output ports for a three-port device with equal split and isolation better than 17 dB between the output ports. Furthermore, the measured insertion loss is less than 0.3 dB and the amplitude and phase imbalance are 0.15 dB and 0°, respectively. Moreover, the divider's remarkable tolerance to the dimensions and sheet resistance of the resistive material of the built-in absorbing load makes the device a very practical component for millimeter-wave and THz systems, in particular radio-astronomy receivers.

中文翻译：

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具有改进的输出端口之间隔离度的毫米波宽带波导功率分配器


我们推出了一种新型紧凑型宽带波导 T 形结功率分配器，特别适用于毫米波和太赫兹频率。它将基于基板的元件合并到波导结构中，以提供输出端口的隔离和匹配。内部端口引入在基板上形成为电子探针的 T 形接头的顶点。这有助于将来自输出端口的反射能量有效耦合到与电子探针集成到同一基板上并通过薄膜技术制造的新型薄膜电阻终端。针对 150-220 GHz 频段设计、仿真和制造了功率分配器，以通过实验验证理论和仿真性能。结果表明，器件的仿真和测量结果非常一致，表明三端口器件的输入和输出端口的回波损耗均达到 20 dB，且输出端口之间的隔离度优于 17 dB。此外，测得的插入损耗小于0.3 dB，幅度和相位不平衡度分别为0.15 dB和0°。此外，该分压器对内置吸收负载的电阻材料的尺寸和薄层电阻具有显着的耐受性，使得该器件成为毫米波和太赫兹系统（特别是射电天文接收器）非常实用的组件。