改进型圆-矩波导模式转换器的研究

Study of improved circular waveguide to rectangle waveguide mode convertor

在某些特定频段上,传统的圆-矩波导模式转换器无法满足其性能要求。针对这一问题,提出一种结构紧凑、反射系数小且波形转换效率高的改进型波导模式转换器,其工作在4.7 GHz,带宽800 MHz。采用切比雪夫阻抗法对其进行理论分析,并计算得到结构尺寸。最后测量结果与仿真结果吻合良好,在工作频带内电压驻波比均小于1.1,证明了该方法的可行性。

In certain frequency bands, the traditional circular to rectangular waveguide mode converter could not satisfy the performance requirement. A improved waveguide mode convertor which had compact structure, small reflection and with a high wave conversion efficiency, whose center frequency was 4.7 GHz, and the bandwidth was 800 MHz was raised to solve this problem. Chebyshev impedance method was used on the theoretical analysis, and the structure size was calculated and obtained. The measured results are in good agreement with the computer simulations results, the VSWR in the bandwidth is less than 1.1, which demonstrates the feasibility of the design method.