端口錯(cuò)誤提示
剛開(kāi)始學(xué)習(xí)CST,從HFSS里輸出的一個(gè)波導(dǎo)的模型,在CST里模擬出現(xiàn)下面的錯(cuò)誤提示
發(fā)現(xiàn)設(shè)置時(shí)只要將端口2中的orientation"negative" 改為"positive",計(jì)算就可以正常進(jìn)行而且結(jié)果和文獻(xiàn)很接近.但這似乎不妥,因?yàn)槎丝?已經(jīng)設(shè)置為orientation"positive"了.只有兩個(gè)端口,1為"positive",2就因該"negative" .錯(cuò)誤的設(shè)置為什么能正常進(jìn)行還得到滿(mǎn)意的結(jié)果了呢?
不是很理解錯(cuò)誤提示的含義,第一句似乎端口2縱向要加密網(wǎng)格,加了，還有錯(cuò)誤提示.
第二句怎么解釋呢?
如何正確操作,才不出現(xiàn)錯(cuò)誤提示呢?
把端口的尺寸徑向加大試一下
最初的設(shè)置是正確的，即orientation"negative" 改為"positive"。
只有同時(shí)激勵(lì)時(shí)才會(huì)頂牛
你不會(huì)同時(shí)激勵(lì)這兩個(gè)端口吧，再想一下S參量的概念就明白了，如果理解不了，你可以去掉端口2，那能量饋進(jìn)去，另一頭你別管，仿真一下試試，兩者結(jié)果應(yīng)該差不多，這樣總理解了吧？
另外CST中波導(dǎo)端口模擬的是一個(gè)連在結(jié)構(gòu)上無(wú)限長(zhǎng)的波導(dǎo)，如果你設(shè)置成"negative" ....那這“無(wú)限長(zhǎng)的波導(dǎo)怎么放”？
謝謝，明白一些了。
但我要得到S21，S11，總要設(shè)兩個(gè)端口吧。設(shè)兩個(gè)端口，就要碰到ORIENTATION的問(wèn)題。
1，2端口的激勵(lì)不是同時(shí)激勵(lì)的～～
幫助里是這樣解釋的:
Orientation: Please define here the orientation of the port, i.e., the direction of radiation. A lower port radiates in the positive direction and an upper port radiates in the negative direction, related to the selected port's normal coordinate axis. Usually the choice corresponds to the definition at the lower or upper boundaries of the calculation domain. However, it is also possible to define internal ports inside the calculation domain.
Note: When defining a new port, or when selecting an old one, the local coordinate system of the port, which is determined by the orientation of the global coordinate system, is displayed in the main view. In addition, an arrow indicates the chosen radiation direction if the port is excited.
這樣從Note看來(lái),設(shè)置的時(shí)候應(yīng)該保證端口面上的紅色箭頭都要指向模型內(nèi)部.這是偶爾會(huì)出現(xiàn)兩端口的orientation都要設(shè)置為negative或positive才行.這又似乎和前一段對(duì)orientation的定義矛盾了.
"A lower port radiates in the positive direction and an upper port radiates in the negative direction, related to the selected port's normal coordinate axis. Usually the choice corresponds to the definition at the lower or upper boundaries of the calculation domain......"怎樣理解呢?
