A cascaded broadband choke device for the transmission shaft in the waveguide
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摘要: 为了抑制波导中引入传动轴导致的微波泄露，保障系统的正常运行，提出了一种级联宽带扼流装置。利用阻抗变换原理分析了级联宽带扼流装置的带宽特性，通过增加介质片的数量提升扼流装置的频带宽度。根据等效波长原理，提高介质片介电常数可缩小扼流装置的体积。通过电磁仿真软件构建扼流装置模型，并分析了介质片数量、介电常数和尺寸对扼流装置性能的影响。仿真结果表明：工作频率为10 GHz时，双层扼流装置的泄露损耗在9.70～10.82 GHz带宽范围内小于−40 dB，相对带宽达到8.2%。最后，采用简化仿真模型进行了实物加工和测试，测试结果证实了仿真结果的正确性，同时验证了该扼流装置的低损耗和宽频带特性。Abstract: This paper presents a cascaded broadband choke device, which can prevent microwave leakage by a transmission shaft in the waveguide. Utilizing the principle of impedance transformation, the bandwidth attributes of the cascaded broadband choke device are examined. It is discerned that augmenting the quantity of dielectric slices can enhance the bandwidth of the choke device. Furthermore, based on the principle of equivalent wavelength, escalating the dielectric constant of the dielectric slice can effectively reduce the choke device’s volume. An electromagnetic simulation software is employed to establish a model of a double-layer choke structure. This model is then used to simulate and analyze the impact of variables such as the number of dielectric slices, dielectric constant, and size on the choke structure’s performance. The simulation outcomes indicate that at a working frequency of 10 GHz, the leakage loss of the double-layer choke structure is less than −40 dB within a bandwidth range of 9.70−10.82 GHz, achieving a relative bandwidth of 8.2%. A simplified simulation model is subsequently utilized for physical fabrication and testing. The experimental findings not only corroborate the accuracy of the simulation results but also affirm the low-loss and wide-bandwidth characteristics of the proposed choke structure.
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Key words:
- choke device /
- broadband /
- cascade /
- transmission shaft /
- waveguide
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图 5 介电常数
$ \varepsilon\mathrm{_r} $ 变化时的泄露损耗Figure 5. Leakage loss of the choke device when
$ \varepsilon\mathrm{_r} $ changes
图 12 传输系数（S21）与泄露损耗（S31）
Figure 12. Transmission coefficient (S21) and leakage loss (S31)
表 1 介电常数不同时介质片的结构参数表
Table 1. Structural parameters of choke device with different permittivity
$ \varepsilon_{\mathrm{r}} $ ${d_1}$/mm ${d_2}$/mm ${d_3}$/mm ${h_1}$/mm ${h_2}$/mm ${h_3}$/mm 4.0 3.00 3.80 13.30 1.50 0.50 1.50 9.0 3.00 3.80 9.84 1.50 0.50 1.50 12.0 3.00 3.80 8.95 1.50 0.50 1.50 
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