hfss基本使用方法

2016-09-29 by:CAE仿真在線來(lái)源:互聯(lián)網(wǎng)

一、基本設(shè)置

1、Tools \ Options,各種基本設(shè)置

1.1 Tools \ Options \ HFSS Options-> Duplicate boundaries/mesh operations with geometry , 被復(fù)制的集合圖形,默認(rèn)擁有同樣的邊界特性

1.2 Tools \ Options \ Modeler Options-> (operations)Auto cover closed ploylines, 自動(dòng)充滿閉合的折線(封閉的線當(dāng)做一個(gè)面);(drawing)Edite properties of new primitives,添加新的xx時(shí),編輯屬性

1.3 Tools \ Options \ Modeler Options-> (project options) when create a new project, insert a design of type HFSS。當(dāng)新建一個(gè)工程時(shí),插入HFSS類型的設(shè)計(jì)。

1.4 Tools \ Options \ General Options->(default units) 系統(tǒng)默認(rèn)度量單位設(shè)置,比如,mm或mil

2、Modelers \ Units,當(dāng)前使用單位設(shè)置

3、HFSS \ Solution Type,當(dāng)前設(shè)計(jì)的種類,有以下四種:

① [Driven Mode] is for calculating the mode-based S-parameters of passive, high-frequency structures such as microstrips, waveguides, and transmission lines which are "driven" by a source, and for computing incident plane wave scattering. The S-matrix solution will be expressed in terms of the incident and reflected powers of waveguide modes.

② [Driven Terminal] is for calculating the terminal-based S-parameters of passive, high-frequency structures with multi-conductor transmission line ports. This solution type results in a terminal-based description in terms of voltages and currents.

③ [Eigen Mode] is for calculating the Eigenmodes, or resonances, of a structure. The Eigenmode solver finds the resonant frequencies of the structure and the fields at those resonant frequencies. Eigenmode designs cannot contain design parameters that depend on frequency.

④ [Transient] is for calculating problems in the time domain. It employs a time-domain "transient" solver. Typically applications include (The mode appears from HFSS 13)

二、畫圖

1、指定材料

快捷工具行,有vacuum字樣為選擇材料,點(diǎn)擊select。選擇已有材料或新添加。

1、Solid,立體或固體

如果是畫一個(gè)長(zhǎng)方體,可以有兩種方式:

① Draw Line,Type為Rectangle,指定With和Height。如果是仿真?zhèn)鬏斁€,推薦這種方式。

② Draw Box。

2、Sheet,二維圖或薄片

可以理解為一片紙,我們不知道它的厚度;暫時(shí)不知道系統(tǒng)是如何對(duì)待二維圖形的:

① Draw Line,Type 為Rectangle,只指定With或Height。

② Draw Rectangle。

3、設(shè)置變量

我們定義某個(gè)立體圖形尺寸時(shí),是可以使用變量的。比如,上面BOX的長(zhǎng),我們可以設(shè)置為L(zhǎng),然后,我們給L指定值。

4、選擇face或者object

① 在無(wú)命令激活的狀態(tài)下,點(diǎn)擊鼠標(biāo)右鍵。在彈出菜單里可以快速選擇select object 或 select face。

② Edit / Select / Select Object 或Select Face。

Tips:可以用Edit / Select / Select by name 來(lái)精確選擇。

5、編輯圖形

這里包括了move,rotate,mirror,duplicate等,調(diào)出菜單的方式主要有:

① Edit/ Arrange 或Edit/ Duplicate

② 選擇物體,在其name上右鍵,選擇彈出菜單中的Edit/Arrange或Edit/Duplicate。

三、仿真設(shè)置

1、HFSS \ Excitations \ Assign \ Wave Port或Lumped Port

是把某個(gè)face給assign成為wave port,所以,操作前要先選擇一個(gè)face;另外,前面選擇HFSS設(shè)計(jì)solution type不同,這里添加的port類型也不同。

關(guān)于Wave Port和Lumped Port的區(qū)別問題:

With lump port=> the excitation is applied at a point/cell, as a voltage or current. 
With wave-port=> the excitation is so-called eigen-wave, such as the quasi-tem wave supported by a microstrip line. It applies over a cross-sectional area. 

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"). 

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. 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 port might be the only way.

2、HFSS \ Analysis Setup \ Add Solution Setup

添加一個(gè)仿真。General里主要設(shè)置三個(gè)參數(shù):

①[Solution Frequency]若取整個(gè)系統(tǒng)設(shè)計(jì)的最大考慮頻寬,mesh會(huì)切最多,模擬時(shí)間較長(zhǎng),但模擬也會(huì)最準(zhǔn)。

②[Maximum Number of Passes] is the maximum number of mesh refinement cycles for HFSS to perform.

還有Options選項(xiàng)卡里的參數(shù):

①[Minimum Converged Passes]

②[Enable Iterative Solver]The iterative solver significantly reduces memory usage, and it can also provide a savings in the solution time for large simulations.

3、HFSS \ Analysis Setup \ Add Frequency Sweep

添加頻率掃描,注意,是在上一個(gè)仿真的基礎(chǔ)上加的。單獨(dú)是沒法完成的。

4、HFSS \ Validation Check

這里是檢查是否已經(jīng)進(jìn)行了完整的設(shè)置,是否可以執(zhí)行analyze。如果可以,那么,就進(jìn)行HFSS\ Analyze all吧!

四、生成報(bào)告

1、HFSS \ Results \ Solution Data

生成仿真基本情況的報(bào)告,包括了:Profile(仿真耗時(shí)、占用計(jì)算機(jī)資源等信息)、Convergence(做了多少次迭代才得到收斂值)、matrixs()、mesh statistics(切了多少mesh)。電腦不同這里的值差別蠻大,我的破電腦居然能跑很快,讓我很驚訝。

2、HFSS \ Results \ Create Terminal Solution Data Report \ Rectangular Plot

S參數(shù)的report,反正在彈出的框框里選你要的參數(shù),然后new report 或者add trace就好了,直接會(huì)有你要的數(shù)據(jù)被繪制到圖中。你也可以選在export matrix data(導(dǎo)出仿真數(shù)據(jù))或者equivalent circuit export(等效電路導(dǎo)出,PSpice.lib或HSPICE.sp)。

3、HFSS \ Fields \ Fields \ E \ Mag_E

查看場(chǎng)覆蓋圖。需要先選擇你要觀察的平面。具體各種model的含義。

Mag E                 電場(chǎng)模                V/m

Mag H                 磁場(chǎng)模               Amps/m

Mag Jvol              體電流密度模         Amps/m2

Mag Jsurf             面電流密度模         Amps/m

Complex MagE          電場(chǎng)復(fù)數(shù)模           V/m

Complex MagH          磁場(chǎng)復(fù)數(shù)模           Amps/m

Complex Mag Jvol      體電流密度的復(fù)數(shù)模   Amps/m2

Complex Mag Jsurf     面電流密度的復(fù)數(shù)模   Amps/m

Vector E                       電場(chǎng)                 V/m

Vector H                       磁場(chǎng)                Amps/m

Vector Jvol                   體電流密度J(x,y,z)           Amps/m2

Vector Jsurf                 面電流密度J(x,y,z)           Amps/m

Vector Real Poynting  坡印亭矢量,定義為E x H*     W/m2

Local SAR                    特定吸收率                   W/kg

Average SAR              平均特定吸收率               W/kg