CST激勵信號excitation signal

激勵信號（excitation signal）是左側導航樹里面看到的高斯信號。這個激勵信號就是上面這幾種激勵結構里所要傳播的信號函數(shù)，包括高斯信號、方波信號、余弦信號等等。不明白它跟Waveguide Port, Plane Wave 和 Discrete Port是MWS里面實現(xiàn)激勵的三種主要的方式有什么關系？怎么根據(jù)實際來選擇呢？

首先，是要確定選擇什么樣的激勵信號函數(shù)（比如高斯信號、方波信號還是余弦信號）還是要選擇什么樣的激勵模式（波導端口、離散端口還是平面波）。
對于激勵模式，CST幫助文件里有解釋：
Waveguide Port：Waveguide ports represent a special kind of boundary condition of the calculation domain, enabling the stimulation as well as the absorption of energy. This kind of port simulates an infinitely long waveguide connected to the structure. The waveguide modes travel out of the structure toward the boundary planes thus leaving the computation domain with very low levels of reflections. ...... The strategies to properly define waveguide ports depend a bit on the type of the transmission line.
Discrete Port：discrete ports offers another possibility to feed the calculation domain with power. Discrete ports are mainly used to simulate lumped element sources inside the calculation domain. These ports are a good approximation for the source in the feeding point of antennas when calculating farfields. In some cases, these ports may also be used to terminate coaxial cables or microstrip lines. However, due to the transmission between transmission lines of different geometric dimensions, reflections may occur that are much larger than those for the termination with waveguide ports. For lower frequencies (compared to the dimension of the discrete port), these reflections may be sufficiently small, such that these kinds of ports may also be used successfully for the S-parameter calculations of multipin connectors.
Plane Wave：The plane wave excitation source provides you the opportunity to simulate an incident wave from a source, located a large distance from the observed object. In combination with farfield monitors, the radar cross section (RCS) of a scatterer may be calculated. Note: In case of plane wave excitation onto an infinite periodic structure, the unit cell approach is recommended, which is accessible via the boundary dialog.
Nearfield Source 和 Farfield Source 與 Plane Wave Source一樣，都是用來仿真場分布的。
而對于激勵信號函數(shù)，高斯信號是默認激勵函數(shù)。除非你的工程需要使用特定的信號系統(tǒng)，再考慮在Excitation Signal Library里面選擇對應的函數(shù)，或者手動導入/創(chuàng)建自定義的函數(shù)。

真的好感動啊！謝謝！

請教，這些信號的幅值有多大呢？從哪里看出來啊

CST MWS幫助文件《Reference Value and Normalizing》。