摘要
通过理论研究以及高频仿真相结合,设计了一款基于脊波导输出的6-18GHZ八路径向功率合成器。本文所设计的新型径向功率合成器代替了传统径向功率合成器输入输出均为同轴线的固有模型,其输入为填充介质的50欧同轴线,输出为具有宽带低阻抗特性的脊波导,工作带宽达到100%。通过在同轴渐变段引入平滑的锥体渐变结构,极大地提高了合成器的功率容量,同时也有效地拓展了工作带宽。在此基础上,为满足宽带需求,还设计了宽带脊波导到微带线的良好过渡转换结构。仿真结果表明,整个功率合成放大电路在全频段内其回波损耗优于18d B,各支路相位完全一致,幅度不平衡度小于0.3d B。这种新型电路结构简单紧凑、易于加工装配,非常适用于现代大功率超宽带应用需求。
Through theoretical analysis and high frequency software simulation, a 6-18 GHZ eight-way radial power combiner with ridge waveguide being its output ports is presented in this letter. The novel radial power combiner in this paper is designed to replace the traditional radial power combiner whose input and output ports has always been the coaxial line. Instead, the input is the 50 ohm coaxial line filling of the dielectric,while the output is replaced to be the ridge waveguide which is good at wider-band applications and lower characteristic impedance. More importantly, its operating bandwidth is up to 100%. By introducing a smooth cone tapered structure into the coaxial line, the power capacity of the combiner is greatly improved and the operating frequency bandwidth is effectively extended. Furthermore, to meet the needs of broadband, a good transition of broadband ridge waveguide to the microstrip line is designed. The simulation results show that the reflection coefficient of the whole power combination amplification circuit is better than 18 d B among the full frequency(6–18GHz), the amplitude unbalance degree of the output ports is less than 0.3d B, and the phase of all output ports are exactly the same. Finally,with simple structure and pretty performance, this novel combiner presented is very suitable for modern millimeter-wave high-power and ultra wideband applications.
引文
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