徹底弄明白HFSS端口激勵的區(qū)別 Lumped port、wave port

2016-11-03 by:CAE仿真在線來源:互聯(lián)網(wǎng)

lumped ed port=> the excitation is applied at a point/cell, as a voltage or current.

lumped port的激勵以電壓或電流的形式,加在一個點或單元上。

wave-port=> the excitation is so-called eigen(本征)-wave, such as the quasi-tem wave supported by a microstrip line. It applies over a cross-sectional area.

而wave-port的激勵稱做本征波,比如微帶線饋源提供的準(zhǔn)TEM波,它加在一個橫截面(傳輸線的橫剖面)上。

voltage is scalar, wave is vector by nature, hence there are substantial difference between the two.

So use waveport whenever possible, because "simulation of wave phenomenon" is what HFSS is designed for. And compare with the "correct" measurement whenever possible (i.e. measure "wave", not simply "voltage").

電壓是標(biāo)量,而波本質(zhì)上是矢量,因此兩者間有很大區(qū)別。當(dāng)情況允許時,盡可能選擇wave port

這是由于HFSS是為“波仿真”設(shè)計的,相對于簡單的“電壓”,測量“波”可使結(jié)果更精確。

Why lumped port is there? It is easy to applied and people found that good/reasonable results can be obtained.

Why? if the frequency is low enough or the excitation is applied at sufficiently small area, then the "wave" can be described by some "voltage" or "current", which must be "measured"/"calculated"/de-embedded/etc in the correct manner.

那為什么還要使用lumped port呢,這是由于lumped port激勵的添加簡單,并且可獲得良好的結(jié)果。如果頻率很低或者激勵加在足夠小的區(qū)域上,“波”就可以用“電壓”或“電流”來描述,必須用正確地方式測量、計算。

if the excitation can be applied on some locally uniform region=>waveport, if geometry/material discontinuities are near/closer to the point of excitation=>lumped ed port might be the only way.

另外,如果激勵可以加在某些局部均勻分布的區(qū)域,應(yīng)該采用waveport,如果激勵點附近存在幾何或材料上的不連續(xù)區(qū),lumped port可能就是唯一選擇了。

開放分享：優(yōu)質(zhì)有限元技術(shù)文章,助你自學(xué)成才