Compact waveguide diplexer based on triangular insert structure
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摘要: 为满足高功率微波系统功率容量和紧凑化需求，提出了一种新型波导双工器。选用过模波导进行设计以提高功率容量，引入三角形金属插片结构谐振腔设计滤波器并在其间引入波导弯头以实现紧凑化。采用微波网络方法对滤波器进行理论分析并设计了两个工作在X波段的滤波器，选择终端短路法确定T型结尺寸并组成双工器。利用电磁仿真软件建模优化和仿真模拟，并对实物进行测试。仿真与测试结果表明，该波导双工器单通道工作时的功率容量分别大于0.11 GW和0.12 GW，两个通道的传输效率分别大于83.9%和82.4%，通道间隔离度大于20 dB。此外还可以根据需求增加滤波器阶数和引入更多的波导弯头以提高空间利用率。Abstract: To meet the power-handling capacity and compactness needs of high-power microwave system, a novel waveguide diplexer is proposed. Overmoded waveguides are introduced to improve power-handling capacity. The resonant cavity with triangular metal insert structure is introduced to design waveguide filters and waveguide bends are introduced to achieve compactness. The theoretical analysis of filter design is carried out by using microwave network method and two X-band filters are designed. Furthermore, the diplexer is formed after the size of T-junction is determined by using terminal short-circuit method. The results of simulation and practical test show that power-handling capacity of each channel of the diplexer is greater than 0.11 GW and 0.12 GW respectively, the transmission efficiency is higher than 83.9% and 82.4% respectively, and the isolation is above 20 dB. Besides, not only can the filter order be increased according to the demand, but also more waveguide bends can be introduced to improve the space utilization.
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Key words:
- waveguide diplexer /
- overmoded waveguide /
- waveguide bend /
- triangular inserts /
- power-handling capacity
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图 1 传统滤波器与新型滤波器对比
Figure 1. Comparison of conventional filter with rectangular insert and novel filter with triangular insert
图 3 带通滤波器的等效阻抗匹配网络
Figure 3. Equivalent impedance matching network of a bandpass filter
图 6 中心频率分别为9.15 GHz和9.75 GHz滤波器的频率响应图
Figure 6. Frequency responses of two filters with central frequencies of 9.15 GHz and 9.75 GHz
表 1 优化参数值
Table 1. Optimized parameter values
(mm) ${w_1}$ ${l_1}$ ${w_2}$ ${l_2}$ ${w_3}$ ${l_3}$ ${w_4}$ ${l_4}$ ${c_1}$ ${c_2}$ ${m_1}$ ${m_2}$ $t$ $h$ 7.28 7.84 7.42 7.76 6.80 7.61 7.42 7.50 19.98 21.83 28.50 27.90 1.00 6.60 
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