高功率TE_(01)过模斜接弯头设计

设计并分析了TE01斜接弯头结构,该结构由两段相同且垂直的模式变换段及与模式变换段呈45°斜接的金属镜面组成。整个结构等效于两个模式变换段对接,但中间存在间距为波导直径的缝隙。模式变换段将纯TE01模式转换为TE01和TE02的混合模式,该混合模式在缝隙中传播时电场呈现对称分布,从而降低了模式转换损耗,提高了传输效率。对设计的Ka波段TE01斜接弯头结构的理论仿真和加工实测结果表明:中心频点转换效率在98%以上,在2 GHz带宽内传输效率95%以上,插损小于0.2 dB,驻波小于1.2。

Design of high power TE01 overmoded miter bend

To meet the needs for assembling, a kind of TE01 miter bend structure is designed and analyzed, which is composed of two perpendicular mode converting circular waveguides and a metal mirror that has a 45 angle with the center line of each circular waveguide. The whole structure is equivalent to a combination of two mode converting parts with a gap in the middle, where the length of the gap is equal to the diameter of the circular waveguide. The mode converting part converts TE01 mode into the mixed mode of TE01 and TE02, whose E-field has a symmetry distribution when propagating through the gap. As a result, the transmission loss is reduced and the efficiency is increased. A Ka band TE01 miter bend circular waveguide was designed, the simulation results obtained from CST match the measured results well. They both show that the transmission efficiency is above 98 % at the center frequency, the insert loss is below 0.2 dB and the VSWR is below 1.2 with the transmission efficiency greater than 95 % in 2 GHz band.