FEKO怎么建模矩圆过渡喇叭？

Horn 類型 .. Antenna Magus 有多模型的
去下載 "[PPT] 第一章 概论" 看看.
[PPT] 第一章 概论 - 檔案類型: Microsoft Powerpoint - HTML 版
反射面天线的馈电喇叭通常接有极化转换器和矩圆过渡波导。极化器将圆极化波转换为线极化波，矩圆过渡波导则将圆波导中的波型变换为矩形波导中的波型，以便与LNB匹配。 ...
met.fzu.edu.cn/cai/satellite/jcjj/jxja/char03.pps
FEKO 手冊裡只有這個例子. 可幫助您下 PORT
20 S-parameter coupling in a stepped waveguide section
Keywords: waveguide, S-parameter, coupling
In this example we consider a waveguide transition from Ku- to X-band by a simple step discontinuity (as shown in Figure 20-1) using two solution methods available in FEKO. The model is first simulated using the MoM using waveguide ports and then using the FEM and modal ports. The rectangular waveguide dimensions are a=15.8 mm and b=7.9 mm for the Ku-band waveguide, and a=22.9 mm and b=10.2 mm for the X-band waveguide, respectively. Only the H10 mode is considered.
The critical frequency for the chosen H10 mode in the smaller Ku-band waveguide is fc=c0 2a=9.4871 GHz. We want to compute S-parameters from this cut–off frequency up to 20 GHz using adaptive frequency sampling.