Chan Cheng-Hsuan, Yu Tsung-Chi, Chang Tsun-Hsu
Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.
National Synchrotron Radiation Research Center, Hsinchu, Taiwan.
Rev Sci Instrum. 2023 Jun 1;94(6). doi: 10.1063/5.0144970.
A microstrip coupler was designed, fabricated, and tested to monitor the power of the 500 MHz kW-level amplifier modules currently installed in an 80-kW solid-state transmitter. The proposed coupler consists of multi-section coupled lines and employs a reverse-coupling scheme, achieving a very compact structure. The dual-side configuration with good termination enables the coupler to have high directivity and wide bandwidth without using any lump components for better temperature stability. Under a low-power test, the measured coupling is 37.69 dB with high directivity from 82 to 700 MHz. The coupling is almost independent of the power at 499.65 MHz, while the directivity slightly decreases to 33.85 dB at the input power of 1 kW. The maximal insertion loss of 0.08 dB was observed at 1-kW input power. The proposed directional coupler suits many high-power applications, especially in low-frequency regimes.
设计、制作并测试了一种微带耦合器，用于监测目前安装在80千瓦固态发射机中的500兆赫千瓦级放大器模块的功率。所提出的耦合器由多节耦合线组成，并采用反向耦合方案，实现了非常紧凑的结构。具有良好终端的双侧配置使耦合器在不使用任何集总元件的情况下具有高方向性和宽带宽，以实现更好的温度稳定性。在低功率测试下，测得的耦合度为37.69分贝，在82至700兆赫范围内具有高方向性。在499.65兆赫时，耦合几乎与功率无关，而在1千瓦输入功率下，方向性略有下降至33.85分贝。在1千瓦输入功率下观察到最大插入损耗为0.08分贝。所提出的定向耦合器适用于许多高功率应用，特别是在低频领域。
